Преобразование Integer в ObservableValue в javafx

Основываясь на @ jfriend00, вот прототип версии:

if (Array.prototype.forEachAsync == null) {
    Array.prototype.forEachAsync = function forEachAsync(fn, thisArg, maxTimePerChunk, callback) {
        let that = this;
        let args = Array.from(arguments);

        let lastArg = args.pop();

        if (lastArg instanceof Function) {
            callback = lastArg;
            lastArg = args.pop();
        } else {
            callback = function() {};
        }
        if (Number(lastArg) === lastArg) {
            maxTimePerChunk = lastArg;
            lastArg = args.pop();
        } else {
            maxTimePerChunk = 200;
        }
        if (args.length === 1) {
            thisArg = lastArg;
        } else {
            thisArg = that
        }

        let index = 0;

        function now() {
            return new Date().getTime();
        }

        function doChunk() {
            let startTime = now();
            while (index < that.length && (now() - startTime) <= maxTimePerChunk) {
                // callback called with args (value, index, array)
                fn.call(thisArg, that[index], index, that);
                ++index;
            }
            if (index < that.length) {
                // set Timeout for async iteration
                setTimeout(doChunk, 1);
            } else {
                callback();
            }
        }

        doChunk();
    }
}