Bump to v4.0.0.

map.js

@@ -0,0 +1,52 @@
+import arrayMap from './internal/arrayMap';
+import baseIteratee from './internal/baseIteratee';
+import baseMap from './internal/baseMap';
+import isArray from './isArray';
+
+/**
+ * Creates an array of values by running each element in `collection` through
+ * `iteratee`. The iteratee is invoked with three arguments:
+ * (value, index|key, collection).
+ *
+ * Many lodash methods are guarded to work as iteratees for methods like
+ * `_.every`, `_.filter`, `_.map`, `_.mapValues`, `_.reject`, and `_.some`.
+ *
+ * The guarded methods are:
+ * `ary`, `curry`, `curryRight`, `drop`, `dropRight`, `every`, `fill`,
+ * `invert`, `parseInt`, `random`, `range`, `rangeRight`, `slice`, `some`,
+ * `sortBy`, `take`, `takeRight`, `template`, `trim`, `trimEnd`, `trimStart`,
+ * and `words`
+ *
+ * @static
+ * @memberOf _
+ * @category Collection
+ * @param {Array|Object} collection The collection to iterate over.
+ * @param {Function|Object|string} [iteratee=_.identity] The function invoked per iteration.
+ * @returns {Array} Returns the new mapped array.
+ * @example
+ *
+ * function square(n) {
+ *   return n * n;
+ * }
+ *
+ * _.map([1, 2], square);
+ * // => [3, 6]
+ *
+ * _.map({ 'a': 1, 'b': 2 }, square);
+ * // => [3, 6] (iteration order is not guaranteed)
+ *
+ * var users = [
+ *   { 'user': 'barney' },
+ *   { 'user': 'fred' }
+ * ];
+ *
+ * // using the `_.property` iteratee shorthand
+ * _.map(users, 'user');
+ * // => ['barney', 'fred']
+ */
+function map(collection, iteratee) {
+  var func = isArray(collection) ? arrayMap : baseMap;
+  return func(collection, baseIteratee(iteratee, 3));
+}
+
+export default map;