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module.exports = ProtoList function setProto(obj, proto) { if (typeof Object.setPrototypeOf === "function") return Object.setPrototypeOf(obj, proto) else obj.__proto__ = proto } function ProtoList () { this.list = [] var root = null Object.defineProperty(this, 'root', { get: function () { return root }, set: function (r) { root = r if (this.list.length) { setProto(this.list[this.list.length - 1], r) } }, enumerable: true, configurable: true }) } ProtoList.prototype = { get length () { return this.list.length } , get keys () { var k = [] for (var i in this.list[0]) k.push(i) return k } , get snapshot () { var o = {} this.keys.forEach(function (k) { o[k] = this.get(k) }, this) return o } , get store () { return this.list[0] } , push : function (obj) { if (typeof obj !== "object") obj = {valueOf:obj} if (this.list.length >= 1) { setProto(this.list[this.list.length - 1], obj) } setProto(obj, this.root) return this.list.push(obj) } , pop : function () { if (this.list.length >= 2) { setProto(this.list[this.list.length - 2], this.root) } return this.list.pop() } , unshift : function (obj) { setProto(obj, this.list[0] || this.root) return this.list.unshift(obj) } , shift : function () { if (this.list.length === 1) { setProto(this.list[0], this.root) } return this.list.shift() } , get : function (key) { return this.list[0][key] } , set : function (key, val, save) { if (!this.length) this.push({}) if (save && this.list[0].hasOwnProperty(key)) this.push({}) return this.list[0][key] = val } , forEach : function (fn, thisp) { for (var key in this.list[0]) fn.call(thisp, key, this.list[0][key]) } , slice : function () { return this.list.slice.apply(this.list, arguments) } , splice : function () { // handle injections var ret = this.list.splice.apply(this.list, arguments) for (var i = 0, l = this.list.length; i < l; i++) { setProto(this.list[i], this.list[i + 1] || this.root) } return ret } }