function throttle(func, wait, options) {
	      var leading = true,
	          trailing = true;

	      if (typeof func != 'function') {
	        throw new TypeError(FUNC_ERROR_TEXT);
	      }
	      if (options === false) {
	        leading = false;
	      } else if (isObject(options)) {
	        leading = 'leading' in options ? !!options.leading : leading;
	        trailing = 'trailing' in options ? !!options.trailing : trailing;
	      }
	      return debounce(func, wait, { 'leading': leading, 'maxWait': +wait, 'trailing': trailing });
	    }
Creates a throttled function that only invokes `func` at most once per
every `wait` milliseconds. The throttled function comes with a `cancel`
method to cancel delayed invocations. Provide an options object to indicate
that `func` should be invoked on the leading and/or trailing edge of the
`wait` timeout. Subsequent calls to the throttled function return the
result of the last `func` call.

**Note:** If `leading` and `trailing` options are `true`, `func` is invoked
on the trailing edge of the timeout only if the the throttled function is
invoked more than once during the `wait` timeout.

See [David Corbacho's article](http://drupalmotion.com/article/debounce-and-throttle-visual-explanation)
for details over the differences between `_.throttle` and `_.debounce`.

@static
@memberOf _
@category Function
@param {Function} func The function to throttle.
@param {number} [wait=0] The number of milliseconds to throttle invocations to.
@param {Object} [options] The options object.
@param {boolean} [options.leading=true] Specify invoking on the leading
 edge of the timeout.
@param {boolean} [options.trailing=true] Specify invoking on the trailing
 edge of the timeout.
@returns {Function} Returns the new throttled function.
@example

// avoid excessively updating the position while scrolling
jQuery(window).on('scroll', _.throttle(updatePosition, 100));

// invoke `renewToken` when the click event is fired, but not more than once every 5 minutes
jQuery('.interactive').on('click', _.throttle(renewToken, 300000, {
  'trailing': false
}));

// cancel a trailing throttled call
jQuery(window).on('popstate', throttled.cancel);