NonEmptyList

Companion object NonEmptyList

final class NonEmptyList[+T] extends AnyVal

A non-empty list: an ordered, immutable, non-empty collection of elements with LinearSeq performance characteristics.

The purpose of NonEmptyList is to allow you to express in a type that a List is non-empty, thereby eliminating the need for (and potential exception from) a run-time check for non-emptiness. For a non-empty sequence with IndexedSeq performance, see Every.

Constructing `NonEmptyList`s

You can construct a NonEmptyList by passing one or more elements to the NonEmptyList.apply factory method:

scala> NonEmptyList(1, 2, 3)
res0: org.scalactic.anyvals.NonEmptyList[Int] = NonEmptyList(1, 2, 3)

Alternatively you can cons elements onto the End singleton object, similar to making a List starting with Nil:

scala> 1 :: 2 :: 3 :: Nil
res0: List[Int] = List(1, 2, 3)

scala> 1 :: 2 :: 3 :: End
res1: org.scalactic.NonEmptyList[Int] = NonEmptyList(1, 2, 3)

Note that although Nil is a List[Nothing], End is not a NonEmptyList[Nothing], because no empty NonEmptyList exists. (A non-empty list is a series of connected links; if you have no links, you have no non-empty list.)

scala> val nil: List[Nothing] = Nil
nil: List[Nothing] = List()

scala> val nada: NonEmptyList[Nothing] = End
<console>:16: error: type mismatch;
found   : org.scalactic.anyvals.End.type
required: org.scalactic.anyvals.NonEmptyList[Nothing]
       val nada: NonEmptyList[Nothing] = End
                                         ^

Working with `NonEmptyList`s

NonEmptyList does not extend Scala's Seq or Traversable traits because these require that implementations may be empty. For example, if you invoke tail on a Seq that contains just one element, you'll get an empty Seq:

scala> List(1).tail
res6: List[Int] = List()

On the other hand, many useful methods exist on Seq that when invoked on a non-empty Seq are guaranteed to not result in an empty Seq. For convenience, NonEmptyList defines a method corresponding to every such Seq method. Here are some examples:

NonEmptyList(1, 2, 3).map(_ + 1)                        // Result: NonEmptyList(2, 3, 4)
NonEmptyList(1).map(_ + 1)                              // Result: NonEmptyList(2)
NonEmptyList(1, 2, 3).containsSlice(NonEmptyList(2, 3)) // Result: true
NonEmptyList(1, 2, 3).containsSlice(NonEmptyList(3, 4)) // Result: false
NonEmptyList(-1, -2, 3, 4, 5).minBy(_.abs)              // Result: -1

NonEmptyList does not currently define any methods corresponding to Seq methods that could result in an empty Seq. However, an implicit converison from NonEmptyList to List is defined in the NonEmptyList companion object that will be applied if you attempt to call one of the missing methods. As a result, you can invoke filter on an NonEmptyList, even though filter could result in an empty sequence—but the result type will be List instead of NonEmptyList:

NonEmptyList(1, 2, 3).filter(_ < 10) // Result: List(1, 2, 3)
NonEmptyList(1, 2, 3).filter(_ > 10) // Result: List()

You can use NonEmptyLists in for expressions. The result will be an NonEmptyList unless you use a filter (an if clause). Because filters are desugared to invocations of filter, the result type will switch to a List at that point. Here are some examples:

scala> import org.scalactic.anyvals._
import org.scalactic.anyvals._

scala> for (i <- NonEmptyList(1, 2, 3)) yield i + 1
res0: org.scalactic.anyvals.NonEmptyList[Int] = NonEmptyList(2, 3, 4)

scala> for (i <- NonEmptyList(1, 2, 3) if i < 10) yield i + 1
res1: List[Int] = List(2, 3, 4)

scala> for {
     |   i <- NonEmptyList(1, 2, 3)
     |   j <- NonEmptyList('a', 'b', 'c')
     | } yield (i, j)
res3: org.scalactic.anyvals.NonEmptyList[(Int, Char)] =
        NonEmptyList((1,a), (1,b), (1,c), (2,a), (2,b), (2,c), (3,a), (3,b), (3,c))

scala> for {
     |   i <- NonEmptyList(1, 2, 3) if i < 10
     |   j <- NonEmptyList('a', 'b', 'c')
     | } yield (i, j)
res6: List[(Int, Char)] =
        List((1,a), (1,b), (1,c), (2,a), (2,b), (2,c), (3,a), (3,b), (3,c))

T: the type of elements contained in this NonEmptyList

Source: NonEmptyList.scala

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final def !=(arg0: Any): Boolean
Definition Classes
Any
final def ##: Int
Definition Classes
Any
def ++[U >: T](other: IterableOnce[U]): NonEmptyList[U]
Returns a new NonEmptyList containing the elements of this NonEmptyList followed by the elements of the passed GenTraversableOnce.
Returns a new NonEmptyList containing the elements of this NonEmptyList followed by the elements of the passed GenTraversableOnce. The element type of the resulting NonEmptyList is the most specific superclass encompassing the element types of this NonEmptyList and the passed GenTraversableOnce.
U
the element type of the returned NonEmptyList
other
the GenTraversableOnce to append
returns
a new NonEmptyList that contains all the elements of this NonEmptyList followed by all elements of other.
def ++[U >: T](other: Every[U]): NonEmptyList[U]
Returns a new NonEmptyList containing the elements of this NonEmptyList followed by the elements of the passed Every.
Returns a new NonEmptyList containing the elements of this NonEmptyList followed by the elements of the passed Every. The element type of the resulting NonEmptyList is the most specific superclass encompassing the element types of this NonEmptyList and the passed Every.
U
the element type of the returned NonEmptyList
other
the Every to append
returns
a new NonEmptyList that contains all the elements of this NonEmptyList followed by all elements of other.
def ++[U >: T](other: NonEmptyList[U]): NonEmptyList[U]
Returns a new NonEmptyList containing the elements of this NonEmptyList followed by the elements of the passed NonEmptyList.
Returns a new NonEmptyList containing the elements of this NonEmptyList followed by the elements of the passed NonEmptyList. The element type of the resulting NonEmptyList is the most specific superclass encompassing the element types of this and the passed NonEmptyList.
U
the element type of the returned NonEmptyList
other
the NonEmptyList to append
returns
a new NonEmptyList that contains all the elements of this NonEmptyList followed by all elements of other.
final def +:[U >: T](element: U): NonEmptyList[U]
Returns a new NonEmptyList with the given element prepended.
Returns a new NonEmptyList with the given element prepended.
Note that :-ending operators are right associative. A mnemonic for +: vs. :+ is: the COLon goes on the COLlection side.
element
the element to prepend to this NonEmptyList
returns
a new NonEmptyList consisting of element followed by all elements of this NonEmptyList.
def :+[U >: T](element: U): NonEmptyList[U]
Returns a new NonEmptyList with the given element appended.
Returns a new NonEmptyList with the given element appended.
Note a mnemonic for +: vs. :+ is: the COLon goes on the COLlection side.
element
the element to append to this NonEmptyList
returns
a new NonEmptyList consisting of all elements of this NonEmptyList followed by element.
final def ::[U >: T](element: U): NonEmptyList[U]
Adds an element to the beginning of this NonEmptyList.
Adds an element to the beginning of this NonEmptyList.
Note that :-ending operators are right associative. A mnemonic for +: vs. :+ is: the COLon goes on the COLlection side.
element
the element to prepend to this NonEmptyList
returns
a NonEmptyList that contains element as first element and that continues with this NonEmptyList.
def :::[U >: T](other: GenTraversableOnce[U]): NonEmptyList[U]
Returns a new NonEmptyList containing the elements of this NonEmptyList followed by the elements of the passed GenTraversableOnce.
Returns a new NonEmptyList containing the elements of this NonEmptyList followed by the elements of the passed GenTraversableOnce. The element type of the resulting NonEmptyList is the most specific superclass encompassing the element types of this NonEmptyList and the passed GenTraversableOnce.
U
the element type of the returned NonEmptyList
other
the GenTraversableOnce to append
returns
a new NonEmptyList that contains all the elements of this NonEmptyList followed by all elements of other.
def :::[U >: T](other: Every[U]): NonEmptyList[U]
Returns a new NonEmptyList containing the elements of this NonEmptyList followed by the elements of the passed Every.
Returns a new NonEmptyList containing the elements of this NonEmptyList followed by the elements of the passed Every. The element type of the resulting NonEmptyList is the most specific superclass encompassing the element types of this and the passed Every.
U
the element type of the returned NonEmptyList
other
the Every to append
returns
a new NonEmptyList that contains all the elements of this NonEmptyList followed by all elements of other.
def :::[U >: T](other: NonEmptyList[U]): NonEmptyList[U]
Returns a new NonEmptyList containing the elements of this NonEmptyList followed by the elements of the passed NonEmptyList.
Returns a new NonEmptyList containing the elements of this NonEmptyList followed by the elements of the passed NonEmptyList. The element type of the resulting NonEmptyList is the most specific superclass encompassing the element types of this and the passed NonEmptyList.
U
the element type of the returned NonEmptyList
other
the NonEmptyList to append
returns
a new NonEmptyList that contains all the elements of this NonEmptyList followed by all elements of other.
final def ==(arg0: Any): Boolean
Definition Classes
Any
final def addString(sb: StringBuilder, start: String, sep: String, end: String): StringBuilder
Appends all elements of this NonEmptyList to a string builder using start, end, and separator strings.
Appends all elements of this NonEmptyList to a string builder using start, end, and separator strings. The written text will consist of a concatenation of the string start; the result of invoking toString on all elements of this NonEmptyList, separated by the string sep; and the string end
sb
the string builder to which elements will be appended
start
the ending string
sep
the separator string
returns
the string builder, sb, to which elements were appended.
final def addString(sb: StringBuilder, sep: String): StringBuilder
Appends all elements of this NonEmptyList to a string builder using a separator string.
Appends all elements of this NonEmptyList to a string builder using a separator string. The written text will consist of a concatenation of the result of invoking toString on of every element of this NonEmptyList, separated by the string sep.
sb
the string builder to which elements will be appended
sep
the separator string
returns
the string builder, sb, to which elements were appended.
final def addString(sb: StringBuilder): StringBuilder
Appends all elements of this NonEmptyList to a string builder.
Appends all elements of this NonEmptyList to a string builder. The written text will consist of a concatenation of the result of invoking toString on of every element of this NonEmptyList, without any separator string.
sb
the string builder to which elements will be appended
returns
the string builder, sb, to which elements were appended.
final def apply(idx: Int): T
Selects an element by its index in the NonEmptyList.
Selects an element by its index in the NonEmptyList.
returns
the element of this NonEmptyList at index idx, where 0 indicates the first element.
final def asInstanceOf[T0]: T0
Definition Classes
Any
final def collectFirst[U](pf: PartialFunction[T, U]): Option[U]
Finds the first element of this NonEmptyList for which the given partial function is defined, if any, and applies the partial function to it.
Finds the first element of this NonEmptyList for which the given partial function is defined, if any, and applies the partial function to it.
pf
the partial function
returns
an Option containing pf applied to the first element for which it is defined, or None if the partial function was not defined for any element.
final def contains(elem: Any): Boolean
Indicates whether this NonEmptyList contains a given value as an element.
Indicates whether this NonEmptyList contains a given value as an element.
elem
the element to look for
returns
true if this NonEmptyList has an element that is equal (as determined by ==) to elem, false otherwise.
final def containsSlice[B](that: NonEmptyList[B]): Boolean
Indicates whether this NonEmptyList contains a given NonEmptyList as a slice.
Indicates whether this NonEmptyList contains a given NonEmptyList as a slice.
that
the NonEmptyList slice to look for
returns
true if this NonEmptyList contains a slice with the same elements as that, otherwise false.
final def containsSlice[B](that: Every[B]): Boolean
Indicates whether this NonEmptyList contains a given Every as a slice.
Indicates whether this NonEmptyList contains a given Every as a slice.
that
the Every slice to look for
returns
true if this NonEmptyList contains a slice with the same elements as that, otherwise false.
final def containsSlice[B](that: GenSeq[B]): Boolean
Indicates whether this NonEmptyList contains a given GenSeq as a slice.
Indicates whether this NonEmptyList contains a given GenSeq as a slice.
that
the GenSeq slice to look for
returns
true if this NonEmptyList contains a slice with the same elements as that, otherwise false.
final def copyToArray[U >: T](arr: Array[U], start: Int, len: Int): Unit
Copies values of this NonEmptyList to an array.
Copies values of this NonEmptyList to an array. Fills the given array arr with at most len elements of this NonEmptyList, beginning at index start. Copying will stop once either the end of the current NonEmptyList is reached, the end of the array is reached, or len elements have been copied.
arr
the array to fill
start
the starting index
len
the maximum number of elements to copy
final def copyToArray[U >: T](arr: Array[U], start: Int): Unit
Copies values of this NonEmptyList to an array.
Copies values of this NonEmptyList to an array. Fills the given array arr with values of this NonEmptyList, beginning at index start. Copying will stop once either the end of the current NonEmptyList is reached, or the end of the array is reached.
arr
the array to fill
start
the starting index
final def copyToArray[U >: T](arr: Array[U]): Unit
Copies values of this NonEmptyList to an array.
Copies values of this NonEmptyList to an array. Fills the given array arr with values of this NonEmptyList. Copying will stop once either the end of the current NonEmptyList is reached, or the end of the array is reached.
arr
the array to fill
final def copyToBuffer[U >: T](buf: Buffer[U]): Unit
Copies all elements of this NonEmptyList to a buffer.
Copies all elements of this NonEmptyList to a buffer.
buf
the buffer to which elements are copied
final def corresponds[B](that: NonEmptyList[B])(p: (T, B) => Boolean): Boolean
Indicates whether every element of this NonEmptyList relates to the corresponding element of a given NonEmptyList by satisfying a given predicate.
Indicates whether every element of this NonEmptyList relates to the corresponding element of a given NonEmptyList by satisfying a given predicate.
B
the type of the elements of that
that
the NonEmptyList to compare for correspondence
p
the predicate, which relates elements from this and the passed NonEmptyList
returns
true if this and the passed NonEmptyList have the same length and p(x, y) is true for all corresponding elements x of this NonEmptyList and y of that, otherwise false.
final def corresponds[B](that: Every[B])(p: (T, B) => Boolean): Boolean
Indicates whether every element of this NonEmptyList relates to the corresponding element of a given Every by satisfying a given predicate.
Indicates whether every element of this NonEmptyList relates to the corresponding element of a given Every by satisfying a given predicate.
B
the type of the elements of that
that
the Every to compare for correspondence
p
the predicate, which relates elements from this NonEmptyList and the passed Every
returns
true if this NonEmptyList and the passed Every have the same length and p(x, y) is true for all corresponding elements x of this NonEmptyList and y of that, otherwise false.
final def corresponds[B](that: GenSeq[B])(p: (T, B) => Boolean): Boolean
Indicates whether every element of this NonEmptyList relates to the corresponding element of a given GenSeq by satisfying a given predicate.
Indicates whether every element of this NonEmptyList relates to the corresponding element of a given GenSeq by satisfying a given predicate.
B
the type of the elements of that
that
the GenSeq to compare for correspondence
p
the predicate, which relates elements from this NonEmptyList and the passed GenSeq
returns
true if this NonEmptyList and the passed GenSeq have the same length and p(x, y) is true for all corresponding elements x of this NonEmptyList and y of that, otherwise false.
final def count(p: (T) => Boolean): Int
Counts the number of elements in this NonEmptyList that satisfy a predicate.
Counts the number of elements in this NonEmptyList that satisfy a predicate.
p
the predicate used to test elements.
returns
the number of elements satisfying the predicate p.
final def distinct: NonEmptyList[T]
Builds a new NonEmptyList from this NonEmptyList without any duplicate elements.
Builds a new NonEmptyList from this NonEmptyList without any duplicate elements.
returns
A new NonEmptyList that contains the first occurrence of every element of this NonEmptyList.
final def endsWith[B](that: NonEmptyList[B]): Boolean
Indicates whether this NonEmptyList ends with the given NonEmptyList.
Indicates whether this NonEmptyList ends with the given NonEmptyList.
that
the NonEmptyList to test
returns
true if this NonEmptyList has that as a suffix, false otherwise.
final def endsWith[B](that: Every[B]): Boolean
Indicates whether this NonEmptyList ends with the given Every.
Indicates whether this NonEmptyList ends with the given Every.
that
the Every to test
returns
true if this NonEmptyList has that as a suffix, false otherwise.
final def endsWith[B](that: GenSeq[B]): Boolean
Indicates whether this NonEmptyList ends with the given GenSeq.
Indicates whether this NonEmptyList ends with the given GenSeq.
that
the sequence to test
returns
true if this NonEmptyList has that as a suffix, false otherwise.
final def exists(p: (T) => Boolean): Boolean
Indicates whether a predicate holds for at least one of the elements of this NonEmptyList.
Indicates whether a predicate holds for at least one of the elements of this NonEmptyList.
returns
true if the given predicate p holds for some of the elements of this NonEmptyList, otherwise false.
final def find(p: (T) => Boolean): Option[T]
Finds the first element of this NonEmptyList that satisfies the given predicate, if any.
Finds the first element of this NonEmptyList that satisfies the given predicate, if any.
p
the predicate used to test elements
returns
an Some containing the first element in this NonEmptyList that satisfies p, or None if none exists.
final def flatMap[U](f: (T) => NonEmptyList[U]): NonEmptyList[U]
Builds a new NonEmptyList by applying a function to all elements of this NonEmptyList and using the elements of the resulting NonEmptyLists.
Builds a new NonEmptyList by applying a function to all elements of this NonEmptyList and using the elements of the resulting NonEmptyLists.
U
the element type of the returned NonEmptyList
f
the function to apply to each element.
returns
a new NonEmptyList containing elements obtained by applying the given function f to each element of this NonEmptyList and concatenating the elements of resulting NonEmptyLists.
final def flatten[B](implicit ev: <:<[T, NonEmptyList[B]]): NonEmptyList[B]
Converts this NonEmptyList of NonEmptyLists into a NonEmptyList formed by the elements of the nested NonEmptyLists.
Converts this NonEmptyList of NonEmptyLists into a NonEmptyList formed by the elements of the nested NonEmptyLists.
Note: You cannot use this flatten method on a NonEmptyList that contains a GenTraversableOnces, because if all the nested GenTraversableOnces were empty, you'd end up with an empty NonEmptyList.
returns
a new NonEmptyList resulting from concatenating all nested NonEmptyLists.
final def fold[U >: T](z: U)(op: (U, U) => U): U
Folds the elements of this NonEmptyList using the specified associative binary operator.
Folds the elements of this NonEmptyList using the specified associative binary operator.
The order in which operations are performed on elements is unspecified and may be nondeterministic.
U
a type parameter for the binary operator, a supertype of T.
z
a neutral element for the fold operation; may be added to the result an arbitrary number of times, and must not change the result (e.g., Nil for list concatenation, 0 for addition, or 1 for multiplication.)
op
a binary operator that must be associative
returns
the result of applying fold operator op between all the elements and z
final def foldLeft[B](z: B)(op: (B, T) => B): B
Applies a binary operator to a start value and all elements of this NonEmptyList, going left to right.
Applies a binary operator to a start value and all elements of this NonEmptyList, going left to right.
B
the result type of the binary operator.
z
the start value.
op
the binary operator.
returns
the result of inserting op between consecutive elements of this NonEmptyList, going left to right, with the start value, z, on the left:
```
op(...op(op(z, x_1), x_2), ..., x_n)
```
where x₁, ..., x_n are the elements of this NonEmptyList.
final def foldRight[B](z: B)(op: (T, B) => B): B
Applies a binary operator to all elements of this NonEmptyList and a start value, going right to left.
Applies a binary operator to all elements of this NonEmptyList and a start value, going right to left.
B
the result of the binary operator
z
the start value
op
the binary operator
returns
the result of inserting op between consecutive elements of this NonEmptyList, going right to left, with the start value, z, on the right:
```
op(x_1, op(x_2, ... op(x_n, z)...))
```
where x₁, ..., x_n are the elements of this NonEmptyList.
final def forall(p: (T) => Boolean): Boolean
Indicates whether a predicate holds for all elements of this NonEmptyList.
Indicates whether a predicate holds for all elements of this NonEmptyList.
p
the predicate used to test elements.
returns
true if the given predicate p holds for all elements of this NonEmptyList, otherwise false.
final def foreach(f: (T) => Unit): Unit
Applies a function f to all elements of this NonEmptyList.
Applies a function f to all elements of this NonEmptyList.
f
the function that is applied for its side-effect to every element. The result of function f is discarded.
def getClass(): Class[_ <: AnyVal]
Definition Classes
AnyVal → Any
final def groupBy[K](f: (T) => K): Map[K, NonEmptyList[T]]
Partitions this NonEmptyList into a map of NonEmptyLists according to some discriminator function.
Partitions this NonEmptyList into a map of NonEmptyLists according to some discriminator function.
K
the type of keys returned by the discriminator function.
f
the discriminator function.
returns
A map from keys to NonEmptyLists such that the following invariant holds:
```
(nonEmptyList.toList partition f)(k) = xs filter (x => f(x) == k)
```
That is, every key k is bound to a NonEmptyList of those elements x for which f(x) equals k.
final def grouped(size: Int): Iterator[NonEmptyList[T]]
Partitions elements into fixed size NonEmptyLists.
Partitions elements into fixed size NonEmptyLists.
size
the number of elements per group
returns
An iterator producing NonEmptyLists of size size, except the last will be truncated if the elements don't divide evenly.
final def hasDefiniteSize: Boolean
Returns true to indicate this NonEmptyList has a definite size, since all NonEmptyLists are strict collections.
final def head: T
Selects the first element of this NonEmptyList.
Selects the first element of this NonEmptyList.
returns
the first element of this NonEmptyList.
final def headOption: Option[T]
Selects the first element of this NonEmptyList and returns it wrapped in a Some.
Selects the first element of this NonEmptyList and returns it wrapped in a Some.
returns
the first element of this NonEmptyList, wrapped in a Some.
final def indexOf[U >: T](elem: U, from: Int): Int
Finds index of first occurrence of some value in this NonEmptyList after or at some start index.
Finds index of first occurrence of some value in this NonEmptyList after or at some start index.
elem
the element value to search for.
from
the start index
returns
the index >= from of the first element of this NonEmptyList that is equal (as determined by ==) to elem, or -1, if none exists.
final def indexOf[U >: T](elem: U): Int
Finds index of first occurrence of some value in this NonEmptyList.
Finds index of first occurrence of some value in this NonEmptyList.
elem
the element value to search for.
returns
the index of the first element of this NonEmptyList that is equal (as determined by ==) to elem, or -1, if none exists.
final def indexOfSlice[U >: T](that: NonEmptyList[U], from: Int): Int
Finds first index after or at a start index where this NonEmptyList contains a given NonEmptyList as a slice.
Finds first index after or at a start index where this NonEmptyList contains a given NonEmptyList as a slice.
that
the NonEmptyList defining the slice to look for
from
the start index
returns
the first index >= from such that the elements of this NonEmptyList starting at this index match the elements of NonEmptyList that, or -1 of no such subsequence exists.
final def indexOfSlice[U >: T](that: Every[U], from: Int): Int
Finds first index after or at a start index where this NonEmptyList contains a given Every as a slice.
Finds first index after or at a start index where this NonEmptyList contains a given Every as a slice.
that
the Every defining the slice to look for
from
the start index
returns
the first index >= from such that the elements of this NonEmptyList starting at this index match the elements of Every that, or -1 of no such subsequence exists.
final def indexOfSlice[U >: T](that: NonEmptyList[U]): Int
Finds first index where this NonEmptyList contains a given NonEmptyList as a slice.
Finds first index where this NonEmptyList contains a given NonEmptyList as a slice.
that
the NonEmptyList defining the slice to look for
returns
the first index such that the elements of this NonEmptyList starting at this index match the elements of NonEmptyList that, or -1 of no such subsequence exists.
final def indexOfSlice[U >: T](that: Every[U]): Int
Finds first index where this NonEmptyList contains a given Every as a slice.
Finds first index where this NonEmptyList contains a given Every as a slice.
that
the Every defining the slice to look for
returns
the first index such that the elements of this NonEmptyList starting at this index match the elements of Every that, or -1 of no such subsequence exists.
final def indexOfSlice[U >: T](that: GenSeq[U], from: Int): Int
Finds first index after or at a start index where this NonEmptyList contains a given GenSeq as a slice.
Finds first index after or at a start index where this NonEmptyList contains a given GenSeq as a slice.
that
the GenSeq defining the slice to look for
from
the start index
returns
the first index >= from at which the elements of this NonEmptyList starting at that index match the elements of GenSeq that, or -1 of no such subsequence exists.
final def indexOfSlice[U >: T](that: GenSeq[U]): Int
Finds first index where this NonEmptyList contains a given GenSeq as a slice.
Finds first index where this NonEmptyList contains a given GenSeq as a slice.
that
the GenSeq defining the slice to look for
returns
the first index at which the elements of this NonEmptyList starting at that index match the elements of GenSeq that, or -1 of no such subsequence exists.
final def indexWhere(p: (T) => Boolean, from: Int): Int
Finds index of the first element satisfying some predicate after or at some start index.
Finds index of the first element satisfying some predicate after or at some start index.
p
the predicate used to test elements.
from
the start index
returns
the index >= from of the first element of this NonEmptyList that satisfies the predicate p, or -1, if none exists.
final def indexWhere(p: (T) => Boolean): Int
Finds index of the first element satisfying some predicate.
Finds index of the first element satisfying some predicate.
p
the predicate used to test elements.
returns
the index of the first element of this NonEmptyList that satisfies the predicate p, or -1, if none exists.
final def indices: Range
Produces the range of all indices of this NonEmptyList.
Produces the range of all indices of this NonEmptyList.
returns
a Range value from 0 to one less than the length of this NonEmptyList.
final def isDefinedAt(idx: Int): Boolean
Tests whether this NonEmptyList contains given index.
Tests whether this NonEmptyList contains given index.
idx
the index to test
returns
true if this NonEmptyList contains an element at position idx, false otherwise.
final def isEmpty: Boolean
Returns false to indicate this NonEmptyList, like all NonEmptyLists, is non-empty.
Returns false to indicate this NonEmptyList, like all NonEmptyLists, is non-empty.
returns
false
final def isInstanceOf[T0]: Boolean
Definition Classes
Any
final def isTraversableAgain: Boolean
Returns true to indicate this NonEmptyList, like all NonEmptyLists, can be traversed repeatedly.
Returns true to indicate this NonEmptyList, like all NonEmptyLists, can be traversed repeatedly.
returns
true
final def iterator: Iterator[T]
Creates and returns a new iterator over all elements contained in this NonEmptyList.
Creates and returns a new iterator over all elements contained in this NonEmptyList.
returns
the new iterator
final def last: T
Selects the last element of this NonEmptyList.
Selects the last element of this NonEmptyList.
returns
the last element of this NonEmptyList.
final def lastIndexOf[U >: T](elem: U, end: Int): Int
Finds the index of the last occurrence of some value in this NonEmptyList before or at a given end index.
Finds the index of the last occurrence of some value in this NonEmptyList before or at a given end index.
elem
the element value to search for.
end
the end index.
returns
the index >= end of the last element of this NonEmptyList that is equal (as determined by ==) to elem, or -1, if none exists.
final def lastIndexOf[U >: T](elem: U): Int
Finds the index of the last occurrence of some value in this NonEmptyList.
Finds the index of the last occurrence of some value in this NonEmptyList.
elem
the element value to search for.
returns
the index of the last element of this NonEmptyList that is equal (as determined by ==) to elem, or -1, if none exists.
final def lastIndexOfSlice[U >: T](that: NonEmptyList[U], end: Int): Int
Finds the last index before or at a given end index where this NonEmptyList contains a given NonEmptyList as a slice.
Finds the last index before or at a given end index where this NonEmptyList contains a given NonEmptyList as a slice.
that
the NonEmptyList defining the slice to look for
end
the end index
returns
the last index >= end at which the elements of this NonEmptyList starting at that index match the elements of NonEmptyList that, or -1 of no such subsequence exists.
final def lastIndexOfSlice[U >: T](that: Every[U], end: Int): Int
Finds the last index before or at a given end index where this NonEmptyList contains a given Every as a slice.
Finds the last index before or at a given end index where this NonEmptyList contains a given Every as a slice.
that
the Every defining the slice to look for
end
the end index
returns
the last index >= end at which the elements of this NonEmptyList starting at that index match the elements of Every that, or -1 of no such subsequence exists.
final def lastIndexOfSlice[U >: T](that: NonEmptyList[U]): Int
Finds the last index where this NonEmptyList contains a given NonEmptyList as a slice.
Finds the last index where this NonEmptyList contains a given NonEmptyList as a slice.
that
the NonEmptyList defining the slice to look for
returns
the last index at which the elements of this NonEmptyList starting at that index match the elements of NonEmptyList that, or -1 of no such subsequence exists.
final def lastIndexOfSlice[U >: T](that: Every[U]): Int
Finds the last index where this NonEmptyList contains a given Every as a slice.
Finds the last index where this NonEmptyList contains a given Every as a slice.
that
the Every defining the slice to look for
returns
the last index at which the elements of this NonEmptyList starting at that index match the elements of Every that, or -1 of no such subsequence exists.
final def lastIndexOfSlice[U >: T](that: GenSeq[U], end: Int): Int
Finds the last index before or at a given end index where this NonEmptyList contains a given GenSeq as a slice.
Finds the last index before or at a given end index where this NonEmptyList contains a given GenSeq as a slice.
that
the GenSeq defining the slice to look for
end
the end index
returns
the last index >= end at which the elements of this NonEmptyList starting at that index match the elements of GenSeq that, or -1 of no such subsequence exists.
final def lastIndexOfSlice[U >: T](that: GenSeq[U]): Int
Finds the last index where this NonEmptyList contains a given GenSeq as a slice.
Finds the last index where this NonEmptyList contains a given GenSeq as a slice.
that
the GenSeq defining the slice to look for
returns
the last index at which the elements of this NonEmptyList starting at that index match the elements of GenSeq that, or -1 of no such subsequence exists.
final def lastIndexWhere(p: (T) => Boolean, end: Int): Int
Finds index of last element satisfying some predicate before or at given end index.
Finds index of last element satisfying some predicate before or at given end index.
p
the predicate used to test elements.
end
the end index
returns
the index >= end of the last element of this NonEmptyList that satisfies the predicate p, or -1, if none exists.
final def lastIndexWhere(p: (T) => Boolean): Int
Finds index of last element satisfying some predicate.
Finds index of last element satisfying some predicate.
p
the predicate used to test elements.
returns
the index of the last element of this NonEmptyList that satisfies the predicate p, or -1, if none exists.
final def lastOption: Option[T]
Returns the last element of this NonEmptyList, wrapped in a Some.
Returns the last element of this NonEmptyList, wrapped in a Some.
returns
the last element, wrapped in a Some.
final def length: Int
The length of this NonEmptyList.
The length of this NonEmptyList.
Note: length and size yield the same result, which will be >= 1.
returns
the number of elements in this NonEmptyList.
final def lengthCompare(len: Int): Int
Compares the length of this NonEmptyList to a test value.
Compares the length of this NonEmptyList to a test value.
len
the test value that gets compared with the length.
returns
a value x where
```
x < 0 if this.length < len
x == 0 if this.length == len
x > 0 if this.length > len
```
final def map[U](f: (T) => U): NonEmptyList[U]
Builds a new NonEmptyList by applying a function to all elements of this NonEmptyList.
Builds a new NonEmptyList by applying a function to all elements of this NonEmptyList.
U
the element type of the returned NonEmptyList.
f
the function to apply to each element.
returns
a new NonEmptyList resulting from applying the given function f to each element of this NonEmptyList and collecting the results.
final def max[U >: T](implicit cmp: Ordering[U]): T
Finds the largest element.
Finds the largest element.
returns
the largest element of this NonEmptyList.
final def maxBy[U](f: (T) => U)(implicit cmp: Ordering[U]): T
Finds the largest result after applying the given function to every element.
Finds the largest result after applying the given function to every element.
returns
the largest result of applying the given function to every element of this NonEmptyList.
final def min[U >: T](implicit cmp: Ordering[U]): T
Finds the smallest element.
Finds the smallest element.
returns
the smallest element of this NonEmptyList.
final def minBy[U](f: (T) => U)(implicit cmp: Ordering[U]): T
Finds the smallest result after applying the given function to every element.
Finds the smallest result after applying the given function to every element.
returns
the smallest result of applying the given function to every element of this NonEmptyList.
final def mkString(start: String, sep: String, end: String): String
Displays all elements of this NonEmptyList in a string using start, end, and separator strings.
Displays all elements of this NonEmptyList in a string using start, end, and separator strings.
start
the starting string.
sep
the separator string.
end
the ending string.
returns
a string representation of this NonEmptyList. The resulting string begins with the string start and ends with the string end. Inside, In the resulting string, the result of invoking toString on all elements of this NonEmptyList are separated by the string sep.
final def mkString(sep: String): String
Displays all elements of this NonEmptyList in a string using a separator string.
Displays all elements of this NonEmptyList in a string using a separator string.
sep
the separator string
returns
a string representation of this NonEmptyList. In the resulting string, the result of invoking toString on all elements of this NonEmptyList are separated by the string sep.
final def mkString: String
Displays all elements of this NonEmptyList in a string.
Displays all elements of this NonEmptyList in a string.
returns
a string representation of this NonEmptyList. In the resulting string, the result of invoking toString on all elements of this NonEmptyList follow each other without any separator string.
final def nonEmpty: Boolean
Returns true to indicate this NonEmptyList, like all NonEmptyLists, is non-empty.
Returns true to indicate this NonEmptyList, like all NonEmptyLists, is non-empty.
returns
true
final def padTo[U >: T](len: Int, elem: U): NonEmptyList[U]
A copy of this NonEmptyList with an element value appended until a given target length is reached.
A copy of this NonEmptyList with an element value appended until a given target length is reached.
len
the target length
elem
he padding value
returns
a new NonEmptyList consisting of all elements of this NonEmptyList followed by the minimal number of occurrences of elem so that the resulting NonEmptyList has a length of at least len.
final def patch[U >: T](from: Int, that: NonEmptyList[U], replaced: Int): NonEmptyList[U]
Produces a new NonEmptyList where a slice of elements in this NonEmptyList is replaced by another NonEmptyList
Produces a new NonEmptyList where a slice of elements in this NonEmptyList is replaced by another NonEmptyList
from
the index of the first replaced element
that
the NonEmptyList whose elements should replace a slice in this NonEmptyList
replaced
the number of elements to drop in the original NonEmptyList
final def permutations: Iterator[NonEmptyList[T]]
Iterates over distinct permutations.
Iterates over distinct permutations.
Here's an example:
```
NonEmptyList('a', 'b', 'b').permutations.toList = List(NonEmptyList(a, b, b), NonEmptyList(b, a, b), NonEmptyList(b, b, a))
```
returns
an iterator that traverses the distinct permutations of this NonEmptyList.
final def prefixLength(p: (T) => Boolean): Int
Returns the length of the longest prefix whose elements all satisfy some predicate.
Returns the length of the longest prefix whose elements all satisfy some predicate.
p
the predicate used to test elements.
returns
the length of the longest prefix of this NonEmptyList such that every element of the segment satisfies the predicate p.
final def product[U >: T](implicit num: Numeric[U]): U
The result of multiplying all the elements of this NonEmptyList.
The result of multiplying all the elements of this NonEmptyList.
This method can be invoked for any NonEmptyList[T] for which an implicit Numeric[T] exists.
returns
the product of all elements
final def reduce[U >: T](op: (U, U) => U): U
Reduces the elements of this NonEmptyList using the specified associative binary operator.
Reduces the elements of this NonEmptyList using the specified associative binary operator.
The order in which operations are performed on elements is unspecified and may be nondeterministic.
U
a type parameter for the binary operator, a supertype of T.
op
a binary operator that must be associative.
returns
the result of applying reduce operator op between all the elements of this NonEmptyList.
final def reduceLeft[U >: T](op: (U, T) => U): U
Applies a binary operator to all elements of this NonEmptyList, going left to right.
Applies a binary operator to all elements of this NonEmptyList, going left to right.
U
the result type of the binary operator.
op
the binary operator.
returns
the result of inserting op between consecutive elements of this NonEmptyList, going left to right:
```
op(...op(op(x_1, x_2), x_3), ..., x_n)
```
where x₁, ..., x_n are the elements of this NonEmptyList.
final def reduceLeftOption[U >: T](op: (U, T) => U): Option[U]
Applies a binary operator to all elements of this NonEmptyList, going left to right, returning the result in a Some.
Applies a binary operator to all elements of this NonEmptyList, going left to right, returning the result in a Some.
U
the result type of the binary operator.
op
the binary operator.
returns
a Some containing the result of reduceLeft(op)
final def reduceOption[U >: T](op: (U, U) => U): Option[U]
final def reduceRight[U >: T](op: (T, U) => U): U
Applies a binary operator to all elements of this NonEmptyList, going right to left.
Applies a binary operator to all elements of this NonEmptyList, going right to left.
U
the result of the binary operator
op
the binary operator
returns
the result of inserting op between consecutive elements of this NonEmptyList, going right to left:
```
op(x_1, op(x_2, ... op(x_{n-1}, x_n)...))
```
where x₁, ..., x_n are the elements of this NonEmptyList.
final def reduceRightOption[U >: T](op: (T, U) => U): Option[U]
Applies a binary operator to all elements of this NonEmptyList, going right to left, returning the result in a Some.
Applies a binary operator to all elements of this NonEmptyList, going right to left, returning the result in a Some.
U
the result of the binary operator
op
the binary operator
returns
a Some containing the result of reduceRight(op)
final def reverse: NonEmptyList[T]
Returns new NonEmptyList with elements in reverse order.
Returns new NonEmptyList with elements in reverse order.
returns
a new NonEmptyList with all elements of this NonEmptyList in reversed order.
final def reverseIterator: Iterator[T]
An iterator yielding elements in reverse order.
An iterator yielding elements in reverse order.
Note: nonEmptyList.reverseIterator is the same as nonEmptyList.reverse.iterator, but might be more efficient.
returns
an iterator yielding the elements of this NonEmptyList in reversed order
final def reverseMap[U](f: (T) => U): NonEmptyList[U]
Builds a new NonEmptyList by applying a function to all elements of this NonEmptyList and collecting the results in reverse order.
Builds a new NonEmptyList by applying a function to all elements of this NonEmptyList and collecting the results in reverse order.
Note: nonEmptyList.reverseMap(f) is the same as nonEmptyList.reverse.map(f), but might be more efficient.
U
the element type of the returned NonEmptyList.
f
the function to apply to each element.
returns
a new NonEmptyList resulting from applying the given function f to each element of this NonEmptyList and collecting the results in reverse order.
final def sameElements[U >: T](that: NonEmptyList[U]): Boolean
Checks if the given NonEmptyList contains the same elements in the same order as this NonEmptyList.
Checks if the given NonEmptyList contains the same elements in the same order as this NonEmptyList.
that
the NonEmptyList with which to compare
returns
true, if both this and the given NonEmptyList contain the same elements in the same order, false otherwise.
final def sameElements[U >: T](that: Every[U]): Boolean
Checks if the given Every contains the same elements in the same order as this NonEmptyList.
Checks if the given Every contains the same elements in the same order as this NonEmptyList.
that
the Every with which to compare
returns
true, if both this and the given Every contain the same elements in the same order, false otherwise.
final def sameElements[U >: T](that: GenIterable[U]): Boolean
Checks if the given GenIterable contains the same elements in the same order as this NonEmptyList.
Checks if the given GenIterable contains the same elements in the same order as this NonEmptyList.
that
the GenIterable with which to compare
returns
true, if both this NonEmptyList and the given GenIterable contain the same elements in the same order, false otherwise.
final def scan[U >: T](z: U)(op: (U, U) => U): NonEmptyList[U]
Computes a prefix scan of the elements of this NonEmptyList.
Computes a prefix scan of the elements of this NonEmptyList.
Note: The neutral element z may be applied more than once.
Here are some examples:
```
NonEmptyList(1, 2, 3).scan(0)(_ + _) == NonEmptyList(0, 1, 3, 6)
NonEmptyList(1, 2, 3).scan("z")(_ + _.toString) == NonEmptyList("z", "z1", "z12", "z123")
```
U
a type parameter for the binary operator, a supertype of T, and the type of the resulting NonEmptyList.
z
a neutral element for the scan operation; may be added to the result an arbitrary number of times, and must not change the result (e.g., Nil for list concatenation, 0 for addition, or 1 for multiplication.)
op
a binary operator that must be associative
returns
a new NonEmptyList containing the prefix scan of the elements in this NonEmptyList
final def scanLeft[B](z: B)(op: (B, T) => B): NonEmptyList[B]
Produces a NonEmptyList containing cumulative results of applying the operator going left to right.
Produces a NonEmptyList containing cumulative results of applying the operator going left to right.
Here are some examples:
```
NonEmptyList(1, 2, 3).scanLeft(0)(_ + _) == NonEmptyList(0, 1, 3, 6)
NonEmptyList(1, 2, 3).scanLeft("z")(_ + _) == NonEmptyList("z", "z1", "z12", "z123")
```
B
the result type of the binary operator and type of the resulting NonEmptyList
z
the start value.
op
the binary operator.
returns
a new NonEmptyList containing the intermediate results of inserting op between consecutive elements of this NonEmptyList, going left to right, with the start value, z, on the left.
final def scanRight[B](z: B)(op: (T, B) => B): NonEmptyList[B]
Produces a NonEmptyList containing cumulative results of applying the operator going right to left.
Produces a NonEmptyList containing cumulative results of applying the operator going right to left.
Here are some examples:
```
NonEmptyList(1, 2, 3).scanRight(0)(_ + _) == NonEmptyList(6, 5, 3, 0)
NonEmptyList(1, 2, 3).scanRight("z")(_ + _) == NonEmptyList("123z", "23z", "3z", "z")
```
B
the result of the binary operator and type of the resulting NonEmptyList
z
the start value
op
the binary operator
returns
a new NonEmptyList containing the intermediate results of inserting op between consecutive elements of this NonEmptyList, going right to left, with the start value, z, on the right.
final def segmentLength(p: (T) => Boolean, from: Int): Int
Computes length of longest segment whose elements all satisfy some predicate.
Computes length of longest segment whose elements all satisfy some predicate.
p
the predicate used to test elements.
from
the index where the search starts.
final def size: Int
The size of this NonEmptyList.
The size of this NonEmptyList.
Note: length and size yield the same result, which will be >= 1.
returns
the number of elements in this NonEmptyList.
final def sliding(size: Int, step: Int): Iterator[NonEmptyList[T]]
Groups elements in fixed size blocks by passing a “sliding window” over them (as opposed to partitioning them, as is done in grouped.), moving the sliding window by a given step each time.
Groups elements in fixed size blocks by passing a “sliding window” over them (as opposed to partitioning them, as is done in grouped.), moving the sliding window by a given step each time.
size
the number of elements per group
step
the distance between the first elements of successive groups
returns
an iterator producing NonEmptyLists of size size, except the last and the only element will be truncated if there are fewer elements than size.
final def sliding(size: Int): Iterator[NonEmptyList[T]]
Groups elements in fixed size blocks by passing a “sliding window” over them (as opposed to partitioning them, as is done in grouped.)
Groups elements in fixed size blocks by passing a “sliding window” over them (as opposed to partitioning them, as is done in grouped.)
size
the number of elements per group
returns
an iterator producing NonEmptyLists of size size, except the last and the only element will be truncated if there are fewer elements than size.
final def sortBy[U](f: (T) => U)(implicit ord: Ordering[U]): NonEmptyList[T]
Sorts this NonEmptyList according to the Ordering of the result of applying the given function to every element.
Sorts this NonEmptyList according to the Ordering of the result of applying the given function to every element.
U
the target type of the transformation f, and the type where the Ordering ord is defined.
f
the transformation function mapping elements to some other domain U.
ord
the ordering assumed on domain U.
returns
a NonEmptyList consisting of the elements of this NonEmptyList sorted according to the Ordering where x < y if ord.lt(f(x), f(y)).
final def sortWith(lt: (T, T) => Boolean): NonEmptyList[T]
Sorts this NonEmptyList according to a comparison function.
Sorts this NonEmptyList according to a comparison function.
The sort is stable. That is, elements that are equal (as determined by lt) appear in the same order in the sorted NonEmptyList as in the original.
returns
a NonEmptyList consisting of the elements of this NonEmptyList sorted according to the comparison function lt.
final def sorted[U >: T](implicit ord: Ordering[U]): NonEmptyList[U]
Sorts this NonEmptyList according to an Ordering.
Sorts this NonEmptyList according to an Ordering.
The sort is stable. That is, elements that are equal (as determined by lt) appear in the same order in the sorted NonEmptyList as in the original.
ord
the Ordering to be used to compare elements.
returns
a NonEmptyList consisting of the elements of this NonEmptyList sorted according to the comparison function lt.
final def startsWith[B](that: NonEmptyList[B], offset: Int): Boolean
Indicates whether this NonEmptyList starts with the given NonEmptyList at the given index.
Indicates whether this NonEmptyList starts with the given NonEmptyList at the given index.
that
the NonEmptyList slice to look for in this NonEmptyList
offset
the index at which this NonEmptyList is searched.
returns
true if this NonEmptyList has that as a slice at the index offset, false otherwise.
final def startsWith[B](that: Every[B], offset: Int): Boolean
Indicates whether this NonEmptyList starts with the given Every at the given index.
Indicates whether this NonEmptyList starts with the given Every at the given index.
that
the Every slice to look for in this NonEmptyList
offset
the index at which this NonEmptyList is searched.
returns
true if this NonEmptyList has that as a slice at the index offset, false otherwise.
final def startsWith[B](that: NonEmptyList[B]): Boolean
Indicates whether this NonEmptyList starts with the given NonEmptyList.
Indicates whether this NonEmptyList starts with the given NonEmptyList.
that
the NonEmptyList to test
returns
true if this collection has that as a prefix, false otherwise.
final def startsWith[B](that: Every[B]): Boolean
Indicates whether this NonEmptyList starts with the given Every.
Indicates whether this NonEmptyList starts with the given Every.
that
the Every to test
returns
true if this collection has that as a prefix, false otherwise.
final def startsWith[B](that: GenSeq[B], offset: Int): Boolean
Indicates whether this NonEmptyList starts with the given GenSeq at the given index.
Indicates whether this NonEmptyList starts with the given GenSeq at the given index.
that
the GenSeq slice to look for in this NonEmptyList
offset
the index at which this NonEmptyList is searched.
returns
true if this NonEmptyList has that as a slice at the index offset, false otherwise.
final def startsWith[B](that: GenSeq[B]): Boolean
Indicates whether this NonEmptyList starts with the given GenSeq.
Indicates whether this NonEmptyList starts with the given GenSeq.
that
the GenSeq slice to look for in this NonEmptyList
returns
true if this NonEmptyList has that as a prefix, false otherwise.
def stringPrefix: String
Returns "NonEmptyList", the prefix of this object's toString representation.
Returns "NonEmptyList", the prefix of this object's toString representation.
returns
the string "NonEmptyList"
final def sum[U >: T](implicit num: Numeric[U]): U
The result of summing all the elements of this NonEmptyList.
The result of summing all the elements of this NonEmptyList.
This method can be invoked for any NonEmptyList[T] for which an implicit Numeric[T] exists.
returns
the sum of all elements
final def to[Col[_]](factory: Factory[T, Col[T]]): Col[T]
Converts this NonEmptyList into a collection of type Col by copying all elements.
Converts this NonEmptyList into a collection of type Col by copying all elements.
Col
the collection type to build.
returns
a new collection containing all elements of this NonEmptyList.
final def toArray[U >: T](implicit classTag: ClassTag[U]): Array[U]
Converts this NonEmptyList to an array.
Converts this NonEmptyList to an array.
returns
an array containing all elements of this NonEmptyList. A ClassTag must be available for the element type of this NonEmptyList.
final def toBuffer[U >: T]: Buffer[U]
Converts this NonEmptyList to a mutable buffer.
Converts this NonEmptyList to a mutable buffer.
returns
a buffer containing all elements of this NonEmptyList.
final def toIndexedSeq: IndexedSeq[T]
Converts this NonEmptyList to an immutable IndexedSeq.
Converts this NonEmptyList to an immutable IndexedSeq.
returns
an immutable IndexedSeq containing all elements of this NonEmptyList.
final def toIterable: Iterable[T]
Converts this NonEmptyList to an iterable collection.
Converts this NonEmptyList to an iterable collection.
returns
an Iterable containing all elements of this NonEmptyList.
final def toIterator: Iterator[T]
Returns an Iterator over the elements in this NonEmptyList.
Returns an Iterator over the elements in this NonEmptyList.
returns
an Iterator containing all elements of this NonEmptyList.
val toList: List[T]
final def toMap[K, V](implicit ev: <:<[T, (K, V)]): Map[K, V]
Converts this NonEmptyList to a map.
Converts this NonEmptyList to a map.
This method is unavailable unless the elements are members of Tuple2, each ((K, V)) becoming a key-value pair in the map. Duplicate keys will be overwritten by later keys.
returns
a map of type immutable.Map[K, V] containing all key/value pairs of type (K, V) of this NonEmptyList.
final def toSeq: Seq[T]
Converts this NonEmptyList to an immutable IndexedSeq.
Converts this NonEmptyList to an immutable IndexedSeq.
returns
an immutable IndexedSeq containing all elements of this NonEmptyList.
final def toSet[U >: T]: Set[U]
Converts this NonEmptyList to a set.
Converts this NonEmptyList to a set.
returns
a set containing all elements of this NonEmptyList.
final def toStream: Stream[T]
Converts this NonEmptyList to a stream.
Converts this NonEmptyList to a stream.
returns
a stream containing all elements of this NonEmptyList.
def toString(): String
Returns a string representation of this NonEmptyList.
Returns a string representation of this NonEmptyList.
returns
the string "NonEmptyList" followed by the result of invoking toString on this NonEmptyList's elements, surrounded by parentheses.
Definition Classes
NonEmptyList → Any
final def toVector: Vector[T]
Converts this NonEmptyList to a Vector.
Converts this NonEmptyList to a Vector.
returns
a Vector containing all elements of this NonEmptyList.
final def transpose[U](implicit ev: <:<[T, NonEmptyList[U]]): NonEmptyList[NonEmptyList[U]]
final def union[U >: T](that: GenSeq[U]): NonEmptyList[U]
Produces a new NonEmptyList that contains all elements of this NonEmptyList and also all elements of a given GenSeq.
Produces a new NonEmptyList that contains all elements of this NonEmptyList and also all elements of a given GenSeq.
nonEmptyListX union ys is equivalent to nonEmptyListX ++ ys.
Another way to express this is that nonEmptyListX union ys computes the order-presevring multi-set union of nonEmptyListX and ys. This union method is hence a counter-part of diff and intersect that also work on multi-sets.
that
the GenSeq to add.
returns
a new NonEmptyList that contains all elements of this NonEmptyList followed by all elements of that GenSeq.
final def union[U >: T](that: NonEmptyList[U]): NonEmptyList[U]
Produces a new NonEmptyList that contains all elements of this NonEmptyList and also all elements of a given NonEmptyList.
Produces a new NonEmptyList that contains all elements of this NonEmptyList and also all elements of a given NonEmptyList.
nonEmptyListX union nonEmptyListY is equivalent to nonEmptyListX ++ nonEmptyListY.
Another way to express this is that nonEmptyListX union nonEmptyListY computes the order-presevring multi-set union of nonEmptyListX and nonEmptyListY. This union method is hence a counter-part of diff and intersect that also work on multi-sets.
that
the NonEmptyList to add.
returns
a new NonEmptyList that contains all elements of this NonEmptyList followed by all elements of that.
final def union[U >: T](that: Every[U]): NonEmptyList[U]
Produces a new NonEmptyList that contains all elements of this NonEmptyList and also all elements of a given Every.
Produces a new NonEmptyList that contains all elements of this NonEmptyList and also all elements of a given Every.
nonEmptyListX union everyY is equivalent to nonEmptyListX ++ everyY.
Another way to express this is that nonEmptyListX union everyY computes the order-presevring multi-set union of nonEmptyListX and everyY. This union method is hence a counter-part of diff and intersect that also work on multi-sets.
that
the Every to add.
returns
a new NonEmptyList that contains all elements of this NonEmptyList followed by all elements of that Every.
final def unzip[L, R](implicit asPair: (T) => (L, R)): (NonEmptyList[L], NonEmptyList[R])
Converts this NonEmptyList of pairs into two NonEmptyLists of the first and second half of each pair.
Converts this NonEmptyList of pairs into two NonEmptyLists of the first and second half of each pair.
L
the type of the first half of the element pairs
R
the type of the second half of the element pairs
asPair
an implicit conversion that asserts that the element type of this NonEmptyList is a pair.
returns
a pair of NonEmptyLists, containing the first and second half, respectively, of each element pair of this NonEmptyList.
final def unzip3[L, M, R](implicit asTriple: (T) => (L, M, R)): (NonEmptyList[L], NonEmptyList[M], NonEmptyList[R])
Converts this NonEmptyList of triples into three NonEmptyLists of the first, second, and and third element of each triple.
Converts this NonEmptyList of triples into three NonEmptyLists of the first, second, and and third element of each triple.
L
the type of the first member of the element triples
R
the type of the third member of the element triples
asTriple
an implicit conversion that asserts that the element type of this NonEmptyList is a triple.
returns
a triple of NonEmptyLists, containing the first, second, and third member, respectively, of each element triple of this NonEmptyList.
final def updated[U >: T](idx: Int, elem: U): NonEmptyList[U]
A copy of this NonEmptyList with one single replaced element.
A copy of this NonEmptyList with one single replaced element.
idx
the position of the replacement
elem
the replacing element
returns
a copy of this NonEmptyList with the element at position idx replaced by elem.
Exceptions thrown
IndexOutOfBoundsException if the passed index is greater than or equal to the length of this NonEmptyList
final def zipAll[O, U >: T](other: Iterable[O], thisElem: U, otherElem: O): NonEmptyList[(U, O)]
Returns a NonEmptyList formed from this NonEmptyList and an iterable collection by combining corresponding elements in pairs.
Returns a NonEmptyList formed from this NonEmptyList and an iterable collection by combining corresponding elements in pairs. If one of the two collections is shorter than the other, placeholder elements will be used to extend the shorter collection to the length of the longer.
other
the Iterable providing the second half of each result pair
thisElem
the element to be used to fill up the result if this NonEmptyList is shorter than that Iterable.
returns
a new NonEmptyList containing pairs consisting of corresponding elements of this NonEmptyList and that. The length of the returned collection is the maximum of the lengths of this NonEmptyList and that. If this NonEmptyList is shorter than that, thisElem values are used to pad the result. If that is shorter than this NonEmptyList, thatElem values are used to pad the result.
final def zipWithIndex: NonEmptyList[(T, Int)]
Zips this NonEmptyList with its indices.
Zips this NonEmptyList with its indices.
returns
A new NonEmptyList containing pairs consisting of all elements of this NonEmptyList paired with their index. Indices start at 0.

Deprecated Value Members

final def /:[B](z: B)(op: (B, T) => B): B
The /: method has been deprecated and will be removed in a future version of Scalactic. Please use foldLeft instead.
The /: method has been deprecated and will be removed in a future version of Scalactic. Please use foldLeft instead.
This method has been deprecated for consistency with Scala 2.13's collections API.
Fold left: applies a binary operator to a start value, z, and all elements of this NonEmptyList, going left to right.
Note: /: is alternate syntax for the foldLeft method; z /: non-empty list is the same as non-empty list foldLeft z.
B
the result of the binary operator
z
the start value
op
the binary operator
returns
the result of inserting op between consecutive elements of this NonEmptyList, going left to right, with the start value, z, on the left:
```
op(...op(op(z, x_1), x_2), ..., x_n)
```
where x₁, ..., x_n are the elements of this NonEmptyList.
Annotations
@deprecated
Deprecated
(Since version 3.1.x) The /: method has been deprecated and will be removed in a future version of Scalactic. Please use foldLeft instead.
final def :\[B](z: B)(op: (T, B) => B): B
The :\\ method has been deprecated and will be removed in a future version of Scalactic. Please use foldRight instead.
The :\\ method has been deprecated and will be removed in a future version of Scalactic. Please use foldRight instead.
This method has been deprecated for consistency with Scala 2.13's collections API.
Fold right: applies a binary operator to all elements of this NonEmptyList and a start value, going right to left.
Note: :\ is alternate syntax for the foldRight method; non-empty list :\ z is the same as non-empty list foldRight z.
B
the result of the binary operator
z
the start value
op
the binary operator
returns
the result of inserting op between consecutive elements of this NonEmptyList, going right to left, with the start value, z, on the right:
```
op(x_1, op(x_2, ... op(x_n, z)...))
```
where x₁, ..., x_n are the elements of this NonEmptyList.
Annotations
@deprecated
Deprecated
(Since version 3.1.x) The :\ method has been deprecated and will be removed in a future version of Scalactic. Please use foldRight instead.

Packages

NonEmptyList

Companion object NonEmptyList

final class NonEmptyList[+T] extends AnyVal

Constructing `NonEmptyList`s

Working with `NonEmptyList`s

Value Members

Deprecated Value Members

Inherited from AnyVal

Inherited from Any

Ungrouped

Packages

NonEmptyList

Companion object NonEmptyList

final class NonEmptyList[+T] extends AnyVal

Constructing NonEmptyLists

Working with NonEmptyLists

Value Members

Deprecated Value Members

Inherited from AnyVal

Inherited from Any

Ungrouped

NonEmptyList

Constructing `NonEmptyList`s

Working with `NonEmptyList`s