Split map out.

.internal/arrayMap.js

@@ -1,20 +0,0 @@
-/**
- * A specialized version of `map` for arrays.
- *
- * @private
- * @param {Array} [array] The array to iterate over.
- * @param {Function} iteratee The function invoked per iteration.
- * @returns {Array} Returns the new mapped array.
- */
-function arrayMap(array, iteratee) {
-  let index = -1
-  const length = array == null ? 0 : array.length
-  const result = new Array(length)
-
-  while (++index < length) {
-    result[index] = iteratee(array[index], index, array)
-  }
-  return result
-}
-
-export default arrayMap

.internal/baseMap.js

@@ -1,22 +0,0 @@
-import baseEach from './baseEach.js'
-import isArrayLike from '../isArrayLike.js'
-
-/**
- * The base implementation of `map`.
- *
- * @private
- * @param {Array|Object} collection The collection to iterate over.
- * @param {Function} iteratee The function invoked per iteration.
- * @returns {Array} Returns the new mapped array.
- */
-function baseMap(collection, iteratee) {
-  let index = -1
-  const result = isArrayLike(collection) ? new Array(collection.length) : []
-
-  baseEach(collection, (value, key, collection) => {
-    result[++index] = iteratee(value, key, collection)
-  })
-  return result
-}
-
-export default baseMap

map.js

@@ -1,23 +1,10 @@
-import arrayMap from './.internal/arrayMap.js'
-import baseMap from './.internal/baseMap.js'
-
 /**
- * Creates an array of values by running each element in `collection` thru
+ * Creates an array of values by running each element of `array` thru `iteratee`.
- * `iteratee`. The iteratee is invoked with three arguments:
+ * The iteratee is invoked with three arguments: (value, index, array).
- * (value, index|key, collection).
  *
- * Many lodash methods are guarded to work as iteratees for methods like
+ * @since 5.0.0
- * `every`, `filter`, `map`, `mapValues`, `reject`, and `some`.
+ * @category Array
- *
+ * @param {Array} array The array to iterate over.
- * The guarded methods are:
- * `ary`, `chunk`, `curry`, `curryRight`, `drop`, `dropRight`, `every`,
- * `fill`, `invert`, `parseInt`, `random`, `range`, `rangeRight`, `repeat`,
- * `sampleSize`, `slice`, `some`, `sortBy`, `split`, `take`, `takeRight`,
- * `template`, `trim`, `trimEnd`, `trimStart`, and `words`
- *
- * @since 0.1.0
- * @category Collection
- * @param {Array|Object} collection The collection to iterate over.
  * @param {Function} iteratee The function invoked per iteration.
  * @returns {Array} Returns the new mapped array.
  * @example
@@ -28,13 +15,16 @@ import baseMap from './.internal/baseMap.js'
  *
  * map([4, 8], square)
  * // => [16, 64]
- *
- * map({ 'a': 4, 'b': 8 }, square)
- * // => [16, 64] (iteration order is not guaranteed)
  */
-function map(collection, iteratee) {
+function map(array, iteratee) {
-  const func = Array.isArray(collection) ? arrayMap : baseMap
+  let index = -1
-  return func(collection, iteratee)
+  const length = array == null ? 0 : array.length
+  const result = new Array(length)
+
+  while (++index < length) {
+    result[index] = iteratee(array[index], index, array)
+  }
+  return result
 }
 
 export default map

mapObject.js

@@ -0,0 +1,29 @@
+/**
+ * Creates an array of values by running each property of `object` thru
+ * `iteratee`. The iteratee is invoked with three arguments: (value, key, object).
+ *
+ * @since 5.0.0
+ * @category Object
+ * @param {Object} object The object to iterate over.
+ * @param {Function} iteratee The function invoked per iteration.
+ * @returns {Array} Returns the new mapped array.
+ * @example
+ *
+ * function square(n) {
+ *   return n * n
+ * }
+ *
+ * map({ 'a': 4, 'b': 8 }, square)
+ * // => [16, 64] (iteration order is not guaranteed)
+ */
+function mapObject(object, iteratee) {
+  const props = Object.keys(object);
+  const result = new Array(props.length)
+
+  props.forEach((key, index) => {
+    result[index] = iteratee(object[key], key, object)
+  })
+  return result
+}
+
+export default mapObject