--- /dev/null
+'use strict';
+
+var copy = require('es5-ext/object/copy')
+ , map = require('es5-ext/object/map')
+ , callable = require('es5-ext/object/valid-callable')
+ , validValue = require('es5-ext/object/valid-value')
+
+ , bind = Function.prototype.bind, defineProperty = Object.defineProperty
+ , hasOwnProperty = Object.prototype.hasOwnProperty
+ , define;
+
+define = function (name, desc, bindTo) {
+ var value = validValue(desc) && callable(desc.value), dgs;
+ dgs = copy(desc);
+ delete dgs.writable;
+ delete dgs.value;
+ dgs.get = function () {
+ if (hasOwnProperty.call(this, name)) return value;
+ desc.value = bind.call(value, (bindTo == null) ? this : this[bindTo]);
+ defineProperty(this, name, desc);
+ return this[name];
+ };
+ return dgs;
+};
+
+module.exports = function (props/*, bindTo*/) {
+ var bindTo = arguments[1];
+ return map(props, function (desc, name) {
+ return define(name, desc, bindTo);
+ });
+};