var toInteger = require('./toInteger');
  
  /** Error message constants. */
  var FUNC_ERROR_TEXT = 'Expected a function';
  
  /**
   * 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.
   */
  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;
    };
  }
  
  module.exports = before;