diff --git a/snippets/mapKeys.md b/snippets/mapKeys.md
new file mode 100644
index 000000000..2b50ddd84
--- /dev/null
+++ b/snippets/mapKeys.md
@@ -0,0 +1,15 @@
+### mapKeys
+
+Creates an object with keys generated by running the provided function for each key and the same values as the provided object.
+
+Use `Object.keys(obj)` to iterate over the object's keys.
+Use `Array.reduce()` to create a new object with the same values and mapped keys using `fn`.
+
+```js
+const mapKeys = (obj, fn) =>
+  Object.keys(obj).reduce((acc,k) => {acc[fn(obj[k], k, obj)] = obj[k]; return acc;},{});
+```
+
+```js
+mapKeys({ 'a': 1, 'b': 2 }, (val, key) => key + val); // { a1: 1, b2: 2 }
+```
diff --git a/snippets/mapValues.md b/snippets/mapValues.md
new file mode 100644
index 000000000..79dbc7415
--- /dev/null
+++ b/snippets/mapValues.md
@@ -0,0 +1,19 @@
+### mapValues
+
+Creates an object with the same keys as the provided object and values generated by running the provided function for each value.
+
+Use `Object.keys(obj)` to iterate over the object's keys.
+Use `Array.reduce()` to create a new object with the same keys and mapped values using `fn`.
+
+```js
+const mapValues = (obj, fn) =>
+  Object.keys(obj).reduce((acc,k) => {acc[k] = fn(obj[k], k, obj); return acc;},{});
+```
+
+```js
+const users = {
+  'fred':    { 'user': 'fred',    'age': 40 },
+  'pebbles': { 'user': 'pebbles', 'age': 1 }
+};
+mapValues(users, u => u.age); // { fred: 40, pebbles: 1 }
+```
diff --git a/tag_database b/tag_database
index 73d0a8310..353f5fda5 100644
--- a/tag_database
+++ b/tag_database
@@ -103,7 +103,9 @@ lcm:math,recursion
 longestItem:array,string,utility
 lowercaseKeys:object
 luhnCheck:math,utility
+mapKeys:object,function
 mapObject:array,object
+mapValues:object,function
 mask:string,utility,regexp
 maxBy:math,array,function
 maxN:array,math