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- // Copyright (c) 2015, Emir Pasic. All rights reserved.
- // Use of this source code is governed by a BSD-style
- // license that can be found in the LICENSE file.
-
- package arraylist
-
- import "github.com/emirpasic/gods/containers"
-
- func assertEnumerableImplementation() {
- var _ containers.EnumerableWithIndex = (*List)(nil)
- }
-
- // Each calls the given function once for each element, passing that element's index and value.
- func (list *List) Each(f func(index int, value interface{})) {
- iterator := list.Iterator()
- for iterator.Next() {
- f(iterator.Index(), iterator.Value())
- }
- }
-
- // Map invokes the given function once for each element and returns a
- // container containing the values returned by the given function.
- func (list *List) Map(f func(index int, value interface{}) interface{}) *List {
- newList := &List{}
- iterator := list.Iterator()
- for iterator.Next() {
- newList.Add(f(iterator.Index(), iterator.Value()))
- }
- return newList
- }
-
- // Select returns a new container containing all elements for which the given function returns a true value.
- func (list *List) Select(f func(index int, value interface{}) bool) *List {
- newList := &List{}
- iterator := list.Iterator()
- for iterator.Next() {
- if f(iterator.Index(), iterator.Value()) {
- newList.Add(iterator.Value())
- }
- }
- return newList
- }
-
- // Any passes each element of the collection to the given function and
- // returns true if the function ever returns true for any element.
- func (list *List) Any(f func(index int, value interface{}) bool) bool {
- iterator := list.Iterator()
- for iterator.Next() {
- if f(iterator.Index(), iterator.Value()) {
- return true
- }
- }
- return false
- }
-
- // All passes each element of the collection to the given function and
- // returns true if the function returns true for all elements.
- func (list *List) All(f func(index int, value interface{}) bool) bool {
- iterator := list.Iterator()
- for iterator.Next() {
- if !f(iterator.Index(), iterator.Value()) {
- return false
- }
- }
- return true
- }
-
- // Find passes each element of the container to the given function and returns
- // the first (index,value) for which the function is true or -1,nil otherwise
- // if no element matches the criteria.
- func (list *List) Find(f func(index int, value interface{}) bool) (int, interface{}) {
- iterator := list.Iterator()
- for iterator.Next() {
- if f(iterator.Index(), iterator.Value()) {
- return iterator.Index(), iterator.Value()
- }
- }
- return -1, nil
- }
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