Merge pull request #431 from atomiks/isPrimitive

[FEATURE] isPrimitive utility snippet

snippets/isPrimitive.md

@@ -0,0 +1,22 @@
+### 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;
+```
+
+```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
+```

tag_database

@@ -75,6 +75,7 @@ isFunction:utility
 isNull:utility
 isNumber:utility
 isPrime:math
+isPrimitive:utility
 isPromiseLike:utility
 isString:utility
 isSymbol:utility