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[yaffs-website] / node_modules / grunt-legacy-log / node_modules / lodash / collection / filter.js

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+var arrayFilter = require('../internal/arrayFilter'),
+    baseCallback = require('../internal/baseCallback'),
+    baseFilter = require('../internal/baseFilter'),
+    isArray = require('../lang/isArray');
+
+/**
+ * Iterates over elements of `collection`, returning an array of all elements
+ * `predicate` returns truthy for. The predicate is bound to `thisArg` and
+ * invoked with three arguments: (value, index|key, collection).
+ *
+ * If a property name is provided for `predicate` the created `_.property`
+ * style callback returns the property value of the given element.
+ *
+ * If a value is also provided for `thisArg` the created `_.matchesProperty`
+ * style callback returns `true` for elements that have a matching property
+ * value, else `false`.
+ *
+ * If an object is provided for `predicate` the created `_.matches` style
+ * callback returns `true` for elements that have the properties of the given
+ * object, else `false`.
+ *
+ * @static
+ * @memberOf _
+ * @alias select
+ * @category Collection
+ * @param {Array|Object|string} collection The collection to iterate over.
+ * @param {Function|Object|string} [predicate=_.identity] The function invoked
+ *  per iteration.
+ * @param {*} [thisArg] The `this` binding of `predicate`.
+ * @returns {Array} Returns the new filtered array.
+ * @example
+ *
+ * _.filter([4, 5, 6], function(n) {
+ *   return n % 2 == 0;
+ * });
+ * // => [4, 6]
+ *
+ * var users = [
+ *   { 'user': 'barney', 'age': 36, 'active': true },
+ *   { 'user': 'fred',   'age': 40, 'active': false }
+ * ];
+ *
+ * // using the `_.matches` callback shorthand
+ * _.pluck(_.filter(users, { 'age': 36, 'active': true }), 'user');
+ * // => ['barney']
+ *
+ * // using the `_.matchesProperty` callback shorthand
+ * _.pluck(_.filter(users, 'active', false), 'user');
+ * // => ['fred']
+ *
+ * // using the `_.property` callback shorthand
+ * _.pluck(_.filter(users, 'active'), 'user');
+ * // => ['barney']
+ */
+function filter(collection, predicate, thisArg) {
+  var func = isArray(collection) ? arrayFilter : baseFilter;
+  predicate = baseCallback(predicate, thisArg, 3);
+  return func(collection, predicate);
+}
+
+module.exports = filter;