Simple JavaScript Debounce Function

debounce.js

// Returns a function, that, as long as it continues to be invoked, will not
// be triggered. The function will be called after it stops being called for
// N milliseconds. If `immediate = true` is passed, trigger the function on the
// leading edge, instead of the trailing.
// Debounce function to slow down the scrolling trigger
    function debounce(func, wait, immediate) {
        var timeout;
        return function() {
            var context = this, args = arguments;
            var later = function() {
                timeout = null;
                if (!immediate) func.apply(context, args);
            };
            var callNow = immediate && !timeout;
            clearTimeout(timeout);
            timeout = setTimeout(later, wait);
            if (callNow) func.apply(context, args);
        };
    }

/* usage */

var myEfficientFn = debounce(function() {
	// All the taxing stuff you do
}, 250, true);

window.addEventListener('resize', myEfficientFn);