Function throttle

libs/leaflet/leaflet-src.js:81–107

(fn, time, context)

  // function, followed by any arguments passed when invoking the bound function.
  // Has an `L.throttle` shortcut.
  function throttle(fn, time, context) {
  	var lock, args, wrapperFn, later;

  	later = function () {
  		// reset lock and call if queued
  		lock = false;
  		if (args) {
  			wrapperFn.apply(context, args);
  			args = false;
  		}
  	};

  	wrapperFn = function () {
  		if (lock) {
  			// called too soon, queue to call later
  			args = arguments;

  		} else {
  			// call and lock until later
  			fn.apply(context, arguments);
  			setTimeout(later, time);
  			lock = true;
  		}
  	};

  	return wrapperFn;
  }

  // @function wrapNum(num: Number, range: Number[], includeMax?: Boolean): Number
  // Returns the number `num` modulo `range` in such a way so it lies within