Travis build: 748 [ci skip]

README.md

@@ -250,6 +250,7 @@
 * [`isFunction`](#isfunction)
 * [`isNull`](#isnull)
 * [`isNumber`](#isnumber)
+* [`isPrimitive`](#isprimitive)
 * [`isPromiseLike`](#ispromiselike)
 * [`isString`](#isstring)
 * [`isSymbol`](#issymbol)
@@ -4204,6 +4205,37 @@ isNumber(1); // true
 <br>[⬆ Back to top](#table-of-contents)
 
 
+### isPrimitive
+
+Returns a boolean determining if the supplied value is primitive or not.
+
+Use `Array.includes()` on an array of type strings which are not primitive,
+supplying the type using `typeof`.
+Since `typeof null` evaluates to `'object'`, it needs to be directly compared.
+
+```js
+const isPrimitive = val => !['object', 'function'].includes(typeof val) || val === null;
+```
+
+<details>
+<summary>Examples</summary>
+
+```js
+isPrimitive(window.someNonExistentProperty); // true
+isPrimitive(null); // true
+isPrimitive(50); // true
+isPrimitive('Hello!'); // true
+isPrimitive(false); // true
+isPrimitive(Symbol()); // true
+isPrimitive([]); // false
+isPrimitive(new String('Hello!')); // false
+```
+
+</details>
+
+<br>[⬆ Back to top](#table-of-contents)
+
+
 ### isPromiseLike
 
 Returns `true` if an object looks like a [`Promise`](https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Promise), `false` otherwise.