Simple JavaScript debounce function - From Grafikart https://www.grafikart.fr/tutoriels/javascript/debounce-throttle-642

debounce.js

function debounce(callback, delay){
    var timer;
    return function(){
        var args = arguments;
        var context = this;
        clearTimeout(timer);
        timer = setTimeout(function(){
            callback.apply(context, args);
        }, delay)
    }
}