feat: mapKeysDeep implemented #26

Author: YuriGor

CHANGELOG.md

@@ -4,8 +4,11 @@
 *(2020-03-21)*
 
 **Breaking Changes**
-- mapDeep renamed to [mapValuesDeep](/#mapvaluesdeep) to conform to Lodash map/mapValues pair of methods.
-- [mapDeep](/#mapdeep) re-implemented to return an array of deep values processed by iteratee.
+- mapDeep renamed to [mapValuesDeep](/#mapvaluesdeep) to conform to Lodash map/mapValues/mapKeys family of methods.
+- [mapDeep](/#mapdeep) re-implemented to return an array of deep values processed by iteratee (same as _.map in Lodash)
+
+**Features added**
+- [mapKeysDeep](/#mapkeysdeep) implemented - returns object with same values but keys modified by iteratee (same as _.mapKeys in Lodash)
 
 ## v4-6-0
 *(2020-03-21)*

README.md

@@ -634,7 +634,7 @@ let children = [
   <summary>expand example</summary>
 
 ```js
-  let res = _.mapValuesDeep(
+  let res = _.mapDeep(
     { hello: { from: { the: 'deep world', and: 'deepdash' } } },
     (v) => v.toUpperCase(),
     { leavesOnly: true }
@@ -646,7 +646,7 @@ let children = [
 [Try it yourself (no yet) ›››](https://codepen.io/yurigor)
 
 ### mapValuesDeep
-› get the same object, but different. [📚 see docs](https://deepdash.io/#mapvaluesdeep)
+› get the object with same structure, but transformed values. [📚 see docs](https://deepdash.io/#mapvaluesdeep)
 <details>
   <summary>expand example</summary>
 
@@ -662,6 +662,22 @@ let children = [
 
 [Try it yourself ›››](https://codepen.io/yurigor/pen/yWBzGV?editors=0010)
 
+### mapKeysDeep
+› get the object with same values, but transformed keys. [📚 see docs](https://deepdash.io/#mapkeysdeep)
+<details>
+  <summary>expand example</summary>
+
+```js
+  let res = _.mapKeysDeep(
+    { hello: { from: { the: 'deep world' } } },
+    (v, k) => k.toUpperCase()
+  );
+  // res -> { HELLO: { FROM: { THE: 'deep world' } } }
+```
+</details>
+
+[Try it yourself (no yet) ›››](https://codepen.io/yurigor/)
+
 ### reduceDeep
 › like reduce, but deep [📚 see docs](https://deepdash.io/#reducedeep)
 <details>

addMapKeysDeep.js

@@ -0,0 +1,13 @@
+'use strict';
+
+var getMixOrPatchIn = require('./private/getMixOrPatchIn.js');
+var getMapKeysDeep = require('./getMapKeysDeep.js');
+
+/* build/tpl */
+
+function addMapKeysDeep(_) {
+  var mixOrPatchIn = getMixOrPatchIn(_);
+  return mixOrPatchIn('mapKeysDeep', getMapKeysDeep(_), !getMapKeysDeep.notChainable);
+}
+
+module.exports = addMapKeysDeep;