Function _keys

deps/async.js:54–65

(obj)

    };

    var _keys = function (obj) {
        if (Object.keys) {
            return Object.keys(obj);
        }
        var keys = [];
        for (var k in obj) {
            if (obj.hasOwnProperty(k)) {
                keys.push(k);
            }
        }
        return keys;
    };

    var _indexOf = function (arr, item) {
        if (arr.indexOf) {