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68 lines
2.3 KiB
JavaScript
68 lines
2.3 KiB
JavaScript
9 years ago
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var arraySome = require('../internal/arraySome'),
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baseCallback = require('../internal/baseCallback'),
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baseSome = require('../internal/baseSome'),
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isArray = require('../lang/isArray'),
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isIterateeCall = require('../internal/isIterateeCall');
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/**
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* Checks if `predicate` returns truthy for **any** element of `collection`.
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* The function returns as soon as it finds a passing value and does not iterate
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* over the entire collection. The predicate is bound to `thisArg` and invoked
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* with three arguments: (value, index|key, collection).
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*
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* If a property name is provided for `predicate` the created `_.property`
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* style callback returns the property value of the given element.
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*
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* If a value is also provided for `thisArg` the created `_.matchesProperty`
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* style callback returns `true` for elements that have a matching property
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* value, else `false`.
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*
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* If an object is provided for `predicate` the created `_.matches` style
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* callback returns `true` for elements that have the properties of the given
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* object, else `false`.
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*
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* @static
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* @memberOf _
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* @alias any
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* @category Collection
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* @param {Array|Object|string} collection The collection to iterate over.
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* @param {Function|Object|string} [predicate=_.identity] The function invoked
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* per iteration.
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* @param {*} [thisArg] The `this` binding of `predicate`.
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* @returns {boolean} Returns `true` if any element passes the predicate check,
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* else `false`.
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* @example
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*
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* _.some([null, 0, 'yes', false], Boolean);
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* // => true
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*
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* var users = [
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* { 'user': 'barney', 'active': true },
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* { 'user': 'fred', 'active': false }
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* ];
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*
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* // using the `_.matches` callback shorthand
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* _.some(users, { 'user': 'barney', 'active': false });
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* // => false
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*
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* // using the `_.matchesProperty` callback shorthand
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* _.some(users, 'active', false);
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* // => true
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*
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* // using the `_.property` callback shorthand
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* _.some(users, 'active');
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* // => true
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*/
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function some(collection, predicate, thisArg) {
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var func = isArray(collection) ? arraySome : baseSome;
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if (thisArg && isIterateeCall(collection, predicate, thisArg)) {
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predicate = undefined;
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}
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if (typeof predicate != 'function' || thisArg !== undefined) {
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predicate = baseCallback(predicate, thisArg, 3);
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}
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return func(collection, predicate);
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}
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module.exports = some;
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