diff --git a/snippets/functions.md b/snippets/functions.md
index fff51096a..3c9550d34 100644
--- a/snippets/functions.md
+++ b/snippets/functions.md
@@ -1,11 +1,15 @@
 ### functions
 
-Returns an array of function property names from own enumerable properties of object.
+Returns an array of function property names from own (and optionally inherited) enumerable properties of an object.
 
-Use `Object.keys(obj)` to iterate over the object's own properties, `Array.filter()` to keep only those that are functions.
+Use `Object.keys(obj)` to iterate over the object's own properties.
+If `inherited` is `true`, use `Object.get.PrototypeOf(obj)` to also get the object's inherited properties.
+Use `Array.filter()` to keep only those properties that are functions.
+Omit the second argument, `inherited`, to not include inherited properties by default.
 
 ```js
-const functions = obj => Object.keys(obj).filter(key => typeof obj[key] === 'function');
+const functions = (obj, inherited = false) =>
+  (inherited ? [...Object.keys(obj), ...Object.keys(Object.getPrototypeOf(obj))] : Object.keys(obj)).filter(key => typeof obj[key] === 'function');
 ```
 
 ```js
@@ -13,5 +17,7 @@ function Foo() {
   this.a = () => 1;
   this.b = () => 2;
 }
+Foo.prototype.c = () => 3;
 functions(new Foo()); // ['a', 'b']
+functions(new Foo(), true); // ['a', 'b', 'c']
 ```
diff --git a/snippets/functionsIn.md b/snippets/functionsIn.md
deleted file mode 100644
index 09a1d4d34..000000000
--- a/snippets/functionsIn.md
+++ /dev/null
@@ -1,22 +0,0 @@
-### functionsIn
-
-Returns an array of function property names from own and inherited enumerable properties of object.
-
-Use `Object.keys(obj)` and `Object.get.PrototypeOf(obj)` to iterate over the object's own and inherited properties, `Array.filter()` to keep only those that are functions.
-Use the spread operator (`...`) to combine all returned property names into one array.
-
-```js
-const functionsIn = obj =>
-  [...Object.keys(obj), ...Object.keys(Object.getPrototypeOf(obj))].filter(
-    key => typeof obj[key] === 'function'
-  );
-```
-
-```js
-function Foo() {
-  this.a = () => 1;
-  this.b = () => 2;
-}
-Foo.prototype.c = () => 3;
-functionsIn(new Foo()); // ['a', 'b', 'c']
-```
diff --git a/tag_database b/tag_database
index 812a08a5c..d9ad2a94e 100644
--- a/tag_database
+++ b/tag_database
@@ -52,7 +52,6 @@ formatDuration:date,math,string,utility
 fromCamelCase:string
 functionName:function,utility
 functions:object,function
-functionsIn:object,function
 gcd:math,recursion
 geometricProgression:math
 getDaysDiffBetweenDates:date