Added getType function

README.md

@@ -261,6 +261,15 @@ const arrayMin = arr => Math.min(...arr);
 // arrayMin([10, 1, 5]) -> 1
 ```
 
+### Get native type of value
+
+Returns lower-cased constructor name of value, "undefined" or "null" if value is undefined or null
+
+```js
+const getType = v => v === undefined ? "undefined" : v === null ? "null" : v.constructor.name.toLowerCase();
+// getType(new Set([1,2,3])) -> "set"
+```
+
 ### Get scroll position
 
 Use `pageXOffset` and `pageYOffset` if they are defined, otherwise `scrollLeft` and `scrollTop`.