function before(n, func) {
      var result;
      if (typeof func != 'function') {
        throw new TypeError(FUNC_ERROR_TEXT);
      }
      n = toInteger(n);
      return function() {
        if (--n > 0) {
          result = func.apply(this, arguments);
        }
        if (n <= 1) {
          func = undefined;
        }
        return result;
      };
    }
Creates a function that invokes `func`, with the `this` binding and arguments
of the created function, while it's called less than `n` times. Subsequent
calls to the created function return the result of the last `func` invocation.

@static
@memberOf _
@since 3.0.0
@category Function
@param {number} n The number of calls at which `func` is no longer invoked.
@param {Function} func The function to restrict.
@returns {Function} Returns the new restricted function.
@example

jQuery(element).on('click', _.before(5, addContactToList));
// => Allows adding up to 4 contacts to the list.