Function _indexOf

deps/async.js:67–77

(arr, item)

    };

    var _indexOf = function (arr, item) {
        if (arr.indexOf) {
            return arr.indexOf(item);
        }
        for (var i = 0; i < arr.length; i += 1) {
            if (arr[i] === item) {
                return i;
            }
        }
        return -1;
    };

    //// exported async module functions ////