Scala Library
scala.collection.immutable

object Nil
[source: scala/collection/immutable/Nil.scala]
case object Nil
extends List[Nothing]
The empty list.
Author
Martin Odersky
Version
1.0, 15/07/2003
Since
2.8
Method Summary
override def equals (that : Any) : Boolean
The equality method defined in `AnyRef`.
override def head : Nothing
Returns this first element of the list.
override def isEmpty : Boolean
Returns true if the list does not contain any elements.
override def productArity : Int
return k for a product A(x_1,...,x_k)
override def productElement (arg0 : Int) : Any
for a product A(x_1,...,x_k), returns x_(n+1) for 0 <= n < k
override def productPrefix : java.lang.String
By default the empty string. Implementations may override this method in order to prepend a string prefix to the result of the toString methods.
protected def readResolve : AnyRef
override def tail : List[Nothing]
Returns this list without its first element.
Methods inherited from List
companion, ::, :::, reverse_:::, mapConserve, ++, ++, toList, take, drop, slice, takeRight, splitAt, takeWhile, dropWhile, span, reverse, stringPrefix, toStream, --, -, sort
Methods inherited from Product
productIterator, productElements
Methods inherited from LinearSeqLike
thisCollection, toCollection, length, apply, iterator, foreach, forall, exists, count, find, foldLeft, foldRight, reduceLeft, reduceRight, last, dropRight, sameElements, lengthCompare, isDefinedAt, segmentLength, indexWhere, lastIndexWhere
Methods inherited from SeqLike
size, prefixLength, indexWhere, findIndexOf, indexOf, indexOf, lastIndexOf, lastIndexOf, lastIndexWhere, reverseMap, reverseIterator, reversedElements, startsWith, startsWith, endsWith, indexOfSeq, indexOfSeq, lastIndexOfSeq, lastIndexOfSeq, contains, union, diff, intersect, removeDuplicates, patch, updated, +:, :+, padTo, sortWith, sortWith, sortBy, toSeq, indices, view, view, hashCode, toString, findLastIndexOf, equalsWith, containsSlice, projection
Methods inherited from PartialFunction
orElse, andThen
Methods inherited from Function1
compose
Methods inherited from IterableLike
elements, toIterable, copyToArray, zip, zipAll, zipWithIndex, canEqual, first, firstOption
Methods inherited from GenericTraversableTemplate
newBuilder, genericBuilder, unzip, flatten, transpose
Methods inherited from TraversableLike
repr, nonEmpty, hasDefiniteSize, map, flatMap, filter, filterNot, partialMap, remove, partition, groupBy, /:, :\, reduceLeftOption, reduceRightOption, sum, product, min, max, headOption, lastOption, init, copyToBuffer, copyToArray, toArray, toIndexedSeq, toSet, mkString, mkString, mkString, addString, addString, addString, withFilter
Methods inherited from AnyRef
getClass, clone, notify, notifyAll, wait, wait, wait, finalize, ==, !=, eq, ne, synchronized
Methods inherited from Any
==, !=, isInstanceOf, asInstanceOf
Method Details
override def isEmpty : Boolean
Returns true if the list does not contain any elements.
Returns
true, iff the list is empty.
Overrides
List.isEmpty
override def head : Nothing
Returns this first element of the list.
Returns
the first element of this list.
Throws
Predef.NoSuchElementException - if the list is empty.
Overrides
List.head
override def tail : List[Nothing]
Returns this list without its first element.
Returns
this list without its first element.
Throws
Predef.NoSuchElementException - if the list is empty.
Overrides
List.tail
override def equals(that : Any) : Boolean
The equality method defined in `AnyRef`.
override def productPrefix : java.lang.String
By default the empty string. Implementations may override this method in order to prepend a string prefix to the result of the toString methods.
override def productArity : Int
return k for a product A(x_1,...,x_k)
override def productElement(arg0 : Int) : Any
for a product A(x_1,...,x_k), returns x_(n+1) for 0 <= n < k
Parameters
n - the index of the element to return
Throws
IndexOutOfBoundsException -
Returns
The element n elements after the first element
protected def readResolve : AnyRef
Scala Library