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80 lines
2.4 KiB
Go
80 lines
2.4 KiB
Go
// Copyright (c) 2015, Emir Pasic. All rights reserved.
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// Use of this source code is governed by a BSD-style
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// license that can be found in the LICENSE file.
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package doublylinkedlist
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import "github.com/emirpasic/gods/v2/containers"
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// Assert Enumerable implementation
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var _ containers.EnumerableWithIndex[int] = (*List[int])(nil)
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// Each calls the given function once for each element, passing that element's index and value.
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func (list *List[T]) Each(f func(index int, value T)) {
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iterator := list.Iterator()
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for iterator.Next() {
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f(iterator.Index(), iterator.Value())
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}
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}
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// Map invokes the given function once for each element and returns a
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// container containing the values returned by the given function.
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func (list *List[T]) Map(f func(index int, value T) T) *List[T] {
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newList := &List[T]{}
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iterator := list.Iterator()
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for iterator.Next() {
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newList.Add(f(iterator.Index(), iterator.Value()))
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}
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return newList
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}
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// Select returns a new container containing all elements for which the given function returns a true value.
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func (list *List[T]) Select(f func(index int, value T) bool) *List[T] {
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newList := &List[T]{}
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iterator := list.Iterator()
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for iterator.Next() {
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if f(iterator.Index(), iterator.Value()) {
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newList.Add(iterator.Value())
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}
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}
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return newList
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}
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// Any passes each element of the container to the given function and
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// returns true if the function ever returns true for any element.
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func (list *List[T]) Any(f func(index int, value T) bool) bool {
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iterator := list.Iterator()
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for iterator.Next() {
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if f(iterator.Index(), iterator.Value()) {
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return true
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}
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}
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return false
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}
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// All passes each element of the container to the given function and
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// returns true if the function returns true for all elements.
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func (list *List[T]) All(f func(index int, value T) bool) bool {
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iterator := list.Iterator()
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for iterator.Next() {
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if !f(iterator.Index(), iterator.Value()) {
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return false
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}
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}
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return true
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}
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// Find passes each element of the container to the given function and returns
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// the first (index,value) for which the function is true or -1,nil otherwise
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// if no element matches the criteria.
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func (list *List[T]) Find(f func(index int, value T) bool) (index int, value T) {
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iterator := list.Iterator()
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for iterator.Next() {
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if f(iterator.Index(), iterator.Value()) {
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return iterator.Index(), iterator.Value()
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}
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}
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var t T
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return -1, t
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}
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