Debounce

debounce.js

function debounce(fn, wait) {
    var timeout;

    return function() {
        var context = this,              // preserve context
            args = arguments,            // preserve arguments
            later = function() {         // define a function that:
                timeout = null;          // * nulls the timeout (GC)
                fn.apply(context, args); // * calls the original fn
            };

        // (re)set the timer which delays the function call
        clearTimeout(timeout);
        timeout = setTimeout(later, wait);
    };
}