source: trip-planner-front/node_modules/lodash/cond.js@ 188ee53

Last change on this file since 188ee53 was 6a3a178, checked in by Ema <ema_spirova@…>, 3 years ago

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1var apply = require('./_apply'),
2 arrayMap = require('./_arrayMap'),
3 baseIteratee = require('./_baseIteratee'),
4 baseRest = require('./_baseRest');
5
6/** Error message constants. */
7var FUNC_ERROR_TEXT = 'Expected a function';
8
9/**
10 * Creates a function that iterates over `pairs` and invokes the corresponding
11 * function of the first predicate to return truthy. The predicate-function
12 * pairs are invoked with the `this` binding and arguments of the created
13 * function.
14 *
15 * @static
16 * @memberOf _
17 * @since 4.0.0
18 * @category Util
19 * @param {Array} pairs The predicate-function pairs.
20 * @returns {Function} Returns the new composite function.
21 * @example
22 *
23 * var func = _.cond([
24 * [_.matches({ 'a': 1 }), _.constant('matches A')],
25 * [_.conforms({ 'b': _.isNumber }), _.constant('matches B')],
26 * [_.stubTrue, _.constant('no match')]
27 * ]);
28 *
29 * func({ 'a': 1, 'b': 2 });
30 * // => 'matches A'
31 *
32 * func({ 'a': 0, 'b': 1 });
33 * // => 'matches B'
34 *
35 * func({ 'a': '1', 'b': '2' });
36 * // => 'no match'
37 */
38function cond(pairs) {
39 var length = pairs == null ? 0 : pairs.length,
40 toIteratee = baseIteratee;
41
42 pairs = !length ? [] : arrayMap(pairs, function(pair) {
43 if (typeof pair[1] != 'function') {
44 throw new TypeError(FUNC_ERROR_TEXT);
45 }
46 return [toIteratee(pair[0]), pair[1]];
47 });
48
49 return baseRest(function(args) {
50 var index = -1;
51 while (++index < length) {
52 var pair = pairs[index];
53 if (apply(pair[0], this, args)) {
54 return apply(pair[1], this, args);
55 }
56 }
57 });
58}
59
60module.exports = cond;
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