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