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/**
 * Creates and returns a new, throttled version of the passed
 *  function, that, when invoked repeatedly, will only actually
 *  call the original function at most once per every 'threshold'
 *  milliseconds. Useful for rate-limiting events that occur
 *  faster than you can keep up with.
 *
 * @link - https://remysharp.com/2010/07/21/throttling-function-calls
 *
 * @usage
 * $(window).on( 'scroll', throttle( function( event ){
 *     // do things on scroll
 * }, 50 ) );
 *
 */
function throttle(fn, threshhold, scope) {
    threshhold = threshhold || (threshhold = 250);
    var last, deferTimer;

    return function () {
        var context = scope || this;

        var now  = +new Date(),
            args = arguments;
        
        if (last && now < last + threshhold) {
            // hold on to it
            clearTimeout(deferTimer);
            deferTimer = setTimeout(function () {
                last = now;
                fn.apply(context, args);
            }, threshhold);
        } else {
            last = now;
            fn.apply(context, args);
        }
    };
}