---
title: getType
tags: type,beginner
---

Returns the native type of a value.

Return `"undefined"` or `"null"` if the value is `undefined` or `null`.
Otherwise, use `Object.prototype.constructor.name` to get the name of the constructor, `String.prototype.toLowerCase()` to return it in lowercase.

```js
const getType = v =>
  v === undefined ? 'undefined' : v === null ? 'null' : v.constructor.name.toLowerCase();
```

```js
getType(new Set([1, 2, 3])); // 'set'
```