You can not select more than 25 topics
Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
35 lines
863 B
35 lines
863 B
var Class = require('./Class');
|
|
var reverse = require('./reverse');
|
|
exports = Class({
|
|
initialize: function Stack() {
|
|
this.clear();
|
|
},
|
|
clear: function() {
|
|
this._items = [];
|
|
this.size = 0;
|
|
},
|
|
push: function(item) {
|
|
this._items.push(item);
|
|
return ++this.size;
|
|
},
|
|
pop: function() {
|
|
if (!this.size) return;
|
|
this.size--;
|
|
return this._items.pop();
|
|
},
|
|
peek: function() {
|
|
return this._items[this.size - 1];
|
|
},
|
|
forEach: function(iterator, ctx) {
|
|
ctx = arguments.length > 1 ? ctx : this;
|
|
var items = this._items;
|
|
for (var i = this.size - 1, j = 0; i >= 0; i--, j++) {
|
|
iterator.call(ctx, items[i], j, this);
|
|
}
|
|
},
|
|
toArr: function() {
|
|
return reverse(this._items);
|
|
}
|
|
});
|
|
|
|
module.exports = exports;
|
|
|