A better, self-contained, JavaScript function throttle

throttle.js

  function throttle(fn, limit, scope) {

      var last;
      var deferTimer;

      return function() {

          var context = scope || this;
          var args = arguments;

          var now = Date.now();
          var diff = now - last;
        
          clearTimeout(deferTimer);

          if (diff < limit) {

              deferTimer = setTimeout(function() {
                last = Date.now();
                fn.apply(context, args);
              }, limit - diff);

          } else {

              last = now;
              fn.apply(context, args);
          }
      };

    }