source: trip-planner-front/node_modules/lodash/negate.js@ bdd6491

Last change on this file since bdd6491 was 6a3a178, checked in by Ema <ema_spirova@…>, 3 years ago

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1/** Error message constants. */
2var FUNC_ERROR_TEXT = 'Expected a function';
3
4/**
5 * Creates a function that negates the result of the predicate `func`. The
6 * `func` predicate is invoked with the `this` binding and arguments of the
7 * created function.
8 *
9 * @static
10 * @memberOf _
11 * @since 3.0.0
12 * @category Function
13 * @param {Function} predicate The predicate to negate.
14 * @returns {Function} Returns the new negated function.
15 * @example
16 *
17 * function isEven(n) {
18 * return n % 2 == 0;
19 * }
20 *
21 * _.filter([1, 2, 3, 4, 5, 6], _.negate(isEven));
22 * // => [1, 3, 5]
23 */
24function negate(predicate) {
25 if (typeof predicate != 'function') {
26 throw new TypeError(FUNC_ERROR_TEXT);
27 }
28 return function() {
29 var args = arguments;
30 switch (args.length) {
31 case 0: return !predicate.call(this);
32 case 1: return !predicate.call(this, args[0]);
33 case 2: return !predicate.call(this, args[0], args[1]);
34 case 3: return !predicate.call(this, args[0], args[1], args[2]);
35 }
36 return !predicate.apply(this, args);
37 };
38}
39
40module.exports = negate;
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