HORIZON PROJECT

/** Error message constants. */

var FUNC_ERROR_TEXT = 'Expected a function';

/**

 * Creates a function that negates the result of the predicate `func`. The

 * `func` predicate is invoked with the `this` binding and arguments of the

 * created function.

 *

 * @static

 * @memberOf _

 * @since 3.0.0

 * @category Function

 * @param {Function} predicate The predicate to negate.

 * @returns {Function} Returns the new negated function.

 * @example

 *

 * function isEven(n) {

 *   return n % 2 == 0;

 * }

 *

 * _.filter([1, 2, 3, 4, 5, 6], _.negate(isEven));

 * // => [1, 3, 5]

 */

function negate(predicate) {

  if (typeof predicate != 'function') {

    throw new TypeError(FUNC_ERROR_TEXT);

  }

  return function() {

    var args = arguments;

    switch (args.length) {

      case 0: return !predicate.call(this);

      case 1: return !predicate.call(this, args[0]);

      case 2: return !predicate.call(this, args[0], args[1]);

      case 3: return !predicate.call(this, args[0], args[1], args[2]);

    }

    return !predicate.apply(this, args);

  };

}

module.exports = negate;