36 lines
852 B
JavaScript
36 lines
852 B
JavaScript
var Class = require('./Class');
|
|
exports = Class({
|
|
initialize: function Queue() {
|
|
this.clear();
|
|
},
|
|
clear: function() {
|
|
this._items = [];
|
|
this.size = 0;
|
|
},
|
|
enqueue: function(item) {
|
|
this._items.push(item);
|
|
return ++this.size;
|
|
},
|
|
dequeue: function() {
|
|
if (!this.size) return;
|
|
this.size--;
|
|
return this._items.shift();
|
|
},
|
|
peek: function() {
|
|
if (!this.size) return;
|
|
return this._items[0];
|
|
},
|
|
forEach: function(iterator, ctx) {
|
|
ctx = arguments.length > 1 ? ctx : this;
|
|
var items = this._items;
|
|
for (var i = 0, size = this.size; i < size; i++) {
|
|
iterator.call(ctx, items[i], i, this);
|
|
}
|
|
},
|
|
toArr: function() {
|
|
return this._items.slice(0);
|
|
}
|
|
});
|
|
|
|
module.exports = exports;
|