revert changes, according to PR

snippets/deepMapKeys.md

@@ -0,0 +1,59 @@
+### deepMapKeys
+
+Deep maps an object keys.
+
+Creates an object with the same values as the provided object and keys generated by running the provided function for each key.
+
+Use Object.keys(obj) to iterate over the object's keys. Use Array.prototype.reduce() to create a new object with the same values and mapped keys using fn.
+
+```js
+const deepMapKeys = (obj, f) => (
+  Array.isArray(obj)
+    ? obj.map(val => deepMapKeys(val, f))
+    : (typeof obj === 'object')
+    ? Object.keys(obj).reduce((acc, current) => {
+      const val = obj[current];
+      acc[f(current)] = (val !== null && typeof val === 'object')
+        ? deepMapKeys(val, f)
+        : acc[f(current)] = val;
+      return acc;
+    }, {})
+    : obj
+);
+```
+
+```js
+'use strict';
+const obj = {
+   foo:'1',
+   isnull:null,
+   nested:{
+      bar:'1',
+      child:{
+         withArray:[
+            {
+               grandChild:[ 'hello' ]
+            }
+         ]
+      }
+   }
+}
+const upperKeysObj = deepMapKeys(obj, (key) => key.toUpperCase());
+/*
+Formatted JSON Data
+{
+   "FOO":"1",
+   "ISNULL":null,
+   "NESTED":{
+      "BAR":"1",
+      "CHILD":{
+         "WITHARRAY":[
+            {
+               "GRANDCHILD":[ 'hello' ]
+            }
+         ]
+      }
+   }
+}
+*/
+```

tag_database

@@ -50,6 +50,7 @@ decapitalize:string,array,intermediate
 deepClone:object,recursion,intermediate
 deepFlatten:array,recursion,intermediate
 deepFreeze:object,recursion,intermediate
+deepMapKeys:object,recursion
 defaults:object,intermediate
 defer:function,intermediate
 degreesToRads:math,beginner

test/deepMapKeys.test.js

@@ -0,0 +1,32 @@
+const expect = require('expect');
+const { deepMapKeys, toCamelCase } = require('./_30s.js');
+
+test('deepMapKeys is a Function', () => {
+  expect(deepMapKeys).toBeInstanceOf(Function);
+});
+
+test('Deep maps object keys', () => {
+  const obj = {
+    'foo_bar': 'hello',
+    'deep_child': {
+      'child_array': ['hello'],
+      'child_object_array': [
+        { 'hola_hello': 'Gamarjoba' }
+      ]
+    }
+  };
+  const expected = {
+    fooBar: 'hello',
+    deepChild: {
+      childArray: ['hello'],
+      childObjectArray: [
+        {
+          holaHello: 'Gamarjoba'
+        }
+      ]
+    }
+  };
+  const camleCaseKeys = k => toCamelCase(k);
+  expect(deepMapKeys(obj, camleCaseKeys)).toEqual(expected);
+});
+