36 lines
863 B
JavaScript
36 lines
863 B
JavaScript
var Class = require('./Class');
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var reverse = require('./reverse');
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exports = Class({
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initialize: function Stack() {
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this.clear();
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},
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clear: function() {
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this._items = [];
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this.size = 0;
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},
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push: function(item) {
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this._items.push(item);
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return ++this.size;
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},
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pop: function() {
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if (!this.size) return;
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this.size--;
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return this._items.pop();
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},
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peek: function() {
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return this._items[this.size - 1];
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},
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forEach: function(iterator, ctx) {
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ctx = arguments.length > 1 ? ctx : this;
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var items = this._items;
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for (var i = this.size - 1, j = 0; i >= 0; i--, j++) {
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iterator.call(ctx, items[i], j, this);
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}
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},
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toArr: function() {
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return reverse(this._items);
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}
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});
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module.exports = exports;
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