Source: enumerable.go in package github.com/emirpasic/gods/lists/arraylist


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