Bump to v4.0.0.

filter.js

@@ -0,0 +1,44 @@
+import arrayFilter from './internal/arrayFilter';
+import baseFilter from './internal/baseFilter';
+import baseIteratee from './internal/baseIteratee';
+import isArray from './isArray';
+
+/**
+ * Iterates over elements of `collection`, returning an array of all elements
+ * `predicate` returns truthy for. The predicate is invoked with three arguments:
+ * (value, index|key, collection).
+ *
+ * @static
+ * @memberOf _
+ * @category Collection
+ * @param {Array|Object} collection The collection to iterate over.
+ * @param {Function|Object|string} [predicate=_.identity] The function invoked per iteration.
+ * @returns {Array} Returns the new filtered array.
+ * @example
+ *
+ * var users = [
+ *   { 'user': 'barney', 'age': 36, 'active': true },
+ *   { 'user': 'fred',   'age': 40, 'active': false }
+ * ];
+ *
+ * _.filter(users, function(o) { return !o.active; });
+ * // => objects for ['fred']
+ *
+ * // using the `_.matches` iteratee shorthand
+ * _.filter(users, { 'age': 36, 'active': true });
+ * // => objects for ['barney']
+ *
+ * // using the `_.matchesProperty` iteratee shorthand
+ * _.filter(users, ['active', false]);
+ * // => objects for ['fred']
+ *
+ * // using the `_.property` iteratee shorthand
+ * _.filter(users, 'active');
+ * // => objects for ['barney']
+ */
+function filter(collection, predicate) {
+  var func = isArray(collection) ? arrayFilter : baseFilter;
+  return func(collection, baseIteratee(predicate, 3));
+}
+
+export default filter;