Debounce Promise

gistfile1.txt

function debouncePromise (func, wait){
    var later, boundFn, promise, min = 10;

    var bind = function (fn, ctx, args){
        boundFn = function (done){
            done(fn.apply(ctx, args));
        };
    };

    var reset = function (){ promise = null; };

    var resolve = function (){
        window.setTimeout(reset, min);
        return promise;
    };

    var sleepLoop = function (done){
        var diff = later - Date.now();
        if (diff > min){
            window.setTimeout(sleepLoop, diff, done);
        } else {
            promise = promise || new Promise(boundFn);
            done();
        }
    };

    return function (/* arguments */){
        later = Date.now() + wait;
        bind(func, this, arguments);
        return new Promise(sleepLoop).then(resolve);
    };
};