Experimental
Building blocks for composing lists.
Globals
Constructors
List(element1, element2, ...)
Constructor can takes any number of elements and creates an instance of List populated with the specified elements.
Parameters
element1 : Object|String|Number
element2 : Object|String|Number
... : Object|String|Number
Functions
addListItem(list, item)
Function adds a item to a List.
removeListItem(list, item)
Function removes an item from a List
List
An ordered collection (also known as a sequence) disallowing duplicate elements. List is composed out of Iterable, therefore it provides custom enumeration behavior that is similar to array (enumerates only on the elements of the list).
List is a base trait and is meant to be part of a composition, since all of its API is private except for the length property.
Examples:
var { List } = require("sdk/util/list");
var MyList = List.compose({
add: function add(item1, item2, /*item3...*/) {
Array.slice(arguments).forEach(this._add.bind(this));
},
remove: function remove(item1, item2, /*item3...*/) {
Array.slice(arguments).forEach(this._remove.bind(this));
}
});
MyList('foo', 'bar', 'baz').length == 3; // true
new MyList('new', 'keyword').length == 2; // true
MyList.apply(null, [1, 2, 3]).length == 3; // true
let list = MyList();
list.length == 0; // true
list.add(1, 2, 3) == 3; // true
Properties
length
Number of elements in this list.