1 | var arrayEvery = require('./_arrayEvery'),
|
2 | baseEvery = require('./_baseEvery'),
|
3 | baseIteratee = require('./_baseIteratee'),
|
4 | isArray = require('./isArray'),
|
5 | isIterateeCall = require('./_isIterateeCall');
|
6 |
|
7 | /**
|
8 | * Checks if `predicate` returns truthy for **all** elements of `collection`.
|
9 | * Iteration is stopped once `predicate` returns falsey. The predicate is
|
10 | * invoked with three arguments: (value, index|key, collection).
|
11 | *
|
12 | * **Note:** This method returns `true` for
|
13 | * [empty collections](https://en.wikipedia.org/wiki/Empty_set) because
|
14 | * [everything is true](https://en.wikipedia.org/wiki/Vacuous_truth) of
|
15 | * elements of empty collections.
|
16 | *
|
17 | * @static
|
18 | * @memberOf _
|
19 | * @since 0.1.0
|
20 | * @category Collection
|
21 | * @param {Array|Object} collection The collection to iterate over.
|
22 | * @param {Function} [predicate=_.identity] The function invoked per iteration.
|
23 | * @param- {Object} [guard] Enables use as an iteratee for methods like `_.map`.
|
24 | * @returns {boolean} Returns `true` if all elements pass the predicate check,
|
25 | * else `false`.
|
26 | * @example
|
27 | *
|
28 | * _.every([true, 1, null, 'yes'], Boolean);
|
29 | * // => false
|
30 | *
|
31 | * var users = [
|
32 | * { 'user': 'barney', 'age': 36, 'active': false },
|
33 | * { 'user': 'fred', 'age': 40, 'active': false }
|
34 | * ];
|
35 | *
|
36 | * // The `_.matches` iteratee shorthand.
|
37 | * _.every(users, { 'user': 'barney', 'active': false });
|
38 | * // => false
|
39 | *
|
40 | * // The `_.matchesProperty` iteratee shorthand.
|
41 | * _.every(users, ['active', false]);
|
42 | * // => true
|
43 | *
|
44 | * // The `_.property` iteratee shorthand.
|
45 | * _.every(users, 'active');
|
46 | * // => false
|
47 | */
|
48 | function every(collection, predicate, guard) {
|
49 | var func = isArray(collection) ? arrayEvery : baseEvery;
|
50 | if (guard && isIterateeCall(collection, predicate, guard)) {
|
51 | predicate = undefined;
|
52 | }
|
53 | return func(collection, baseIteratee(predicate, 3));
|
54 | }
|
55 |
|
56 | module.exports = every;
|