57 lines
1.8 KiB
JavaScript
57 lines
1.8 KiB
JavaScript
|
var arrayEvery = require('./_arrayEvery'),
|
||
|
|
baseEvery = require('./_baseEvery'),
|
||
|
|
baseIteratee = require('./_baseIteratee'),
|
||
|
|
isArray = require('./isArray'),
|
||
|
|
isIterateeCall = require('./_isIterateeCall');
|
||
|
|
|
||
|
|
/**
|
||
|
|
* Checks if `predicate` returns truthy for **all** elements of `collection`.
|
||
|
|
* Iteration is stopped once `predicate` returns falsey. The predicate is
|
||
|
|
* invoked with three arguments: (value, index|key, collection).
|
||
|
|
*
|
||
|
|
* **Note:** This method returns `true` for
|
||
|
|
* [empty collections](https://en.wikipedia.org/wiki/Empty_set) because
|
||
|
|
* [everything is true](https://en.wikipedia.org/wiki/Vacuous_truth) of
|
||
|
|
* elements of empty collections.
|
||
|
|
*
|
||
|
|
* @static
|
||
|
|
* @memberOf _
|
||
|
|
* @since 0.1.0
|
||
|
|
* @category Collection
|
||
|
|
* @param {Array|Object} collection The collection to iterate over.
|
||
|
|
* @param {Function} [predicate=_.identity] The function invoked per iteration.
|
||
|
|
* @param- {Object} [guard] Enables use as an iteratee for methods like `_.map`.
|
||
|
|
* @returns {boolean} Returns `true` if all elements pass the predicate check,
|
||
|
|
* else `false`.
|
||
|
|
* @example
|
||
|
|
*
|
||
|
|
* _.every([true, 1, null, 'yes'], Boolean);
|
||
|
|
* // => false
|
||
|
|
*
|
||
|
|
* var users = [
|
||
|
|
* { 'user': 'barney', 'age': 36, 'active': false },
|
||
|
|
* { 'user': 'fred', 'age': 40, 'active': false }
|
||
|
|
* ];
|
||
|
|
*
|
||
|
|
* // The `_.matches` iteratee shorthand.
|
||
|
|
* _.every(users, { 'user': 'barney', 'active': false });
|
||
|
|
* // => false
|
||
|
|
*
|
||
|
|
* // The `_.matchesProperty` iteratee shorthand.
|
||
|
|
* _.every(users, ['active', false]);
|
||
|
|
* // => true
|
||
|
|
*
|
||
|
|
* // The `_.property` iteratee shorthand.
|
||
|
|
* _.every(users, 'active');
|
||
|
|
* // => false
|
||
|
|
*/
|
||
|
|
function every(collection, predicate, guard) {
|
||
|
|
var func = isArray(collection) ? arrayEvery : baseEvery;
|
||
|
|
if (guard && isIterateeCall(collection, predicate, guard)) {
|
||
|
|
predicate = undefined;
|
||
|
|
}
|
||
|
|
return func(collection, baseIteratee(predicate, 3));
|
||
|
|
}
|
||
|
|
|
||
|
|
module.exports = every;
|