8ee50178f3
Correct: `Array.from()` (it’s a static method) Incorrect: `Array.join()` (doesn’t exist; it’s a prototype method) This patch uses the common `#` syntax to denote `.prototype.`.
21 lines
568 B
Markdown
21 lines
568 B
Markdown
### isPrimitive
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Returns a boolean determining if the passed value is primitive or not.
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Use `Array.prototype.includes()` on an array of type strings which are not primitive,
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supplying the type using `typeof`.
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Since `typeof null` evaluates to `'object'`, it needs to be directly compared.
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```js
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const isPrimitive = val => !['object', 'function'].includes(typeof val) || val === null;
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```
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```js
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isPrimitive(null); // true
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isPrimitive(50); // true
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isPrimitive('Hello!'); // true
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isPrimitive(false); // true
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isPrimitive(Symbol()); // true
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isPrimitive([]); // false
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```
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