es5-ext/test/object/map-keys.js

"use strict";
module.exports = function (t, a) {
	a.deep(t({ 1: 1, 2: 2, 3: 3 }, function (key, value) {
		return "x" + (key + value);
	}), { x11: 1, x22: 2, x33: 3 });
};