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Memo: Debounce Task

To prevent multi-execution from caller in short time, use debounce for single execution.

var debounce = function (func, threshold, execAsap) {
    var timeout;
    return function debounced () {
        var obj = this, args = arguments;
        function delayed () {
            if (!execAsap)
            func.apply(obj, args);
            timeout = null;
        };
        if (timeout)
            clearTimeout(timeout);
        else if (execAsap)
            func.apply(obj, args);
        timeout = setTimeout(delayed, threshold || 100);
    };
}