JavaScript: debounce

Published on Author craigzearfossLeave a comment
/* 
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` is passed, trigger the function on the
leading edge, instead of the trailing.

Usage:
var myEfficientFn = debounce(function() {
   // All the taxing stuff you do
}, 250);
window.addEventListener('resize', myEfficientFn);

reference: http://davidwalsh.name/essential-javascript-functions
*/

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);
   };
};

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