Quick error handling function

fail.js

function fail(errorCb, successCb, context) {
    return function () {
        var args = Array.prototype.slice.call(arguments),
            isError = !!args[0];

        ((isError ? errorCb : successCb) || function () {
            return arguments;
        }).apply(context || null, isError ? args : args.splice(1));
    };
}

Usage

fs.readDir('/tmp', fail(function (error) {
    console.log(error);
}, function (files) {
    console.log(files);
}));

Predefined error handling

function myFail(done) {
    return fail(function (error) {
        throw error;
    }, done);
}
fs.readDir('/tmp', myFail(function (files) {
    console.log(files);
}));