Fully renamed and updated everything, tagged, built

snippets/isFunction.md

@@ -0,0 +1,11 @@
+### isFunction
+
+Checks if the given argument is a function.
+
+Use `typeof` to check if a value is classified as a function primitive.
+
+```js
+const isFunction = val => val && typeof val === 'function';
+// isFunction('x') -> false
+// isFunction(x => x) -> true
+```