### isPlainObject

Checks if the provided value is an object created by the Object constructor.

Check if the provided value is truthy, use `typeof` to check if it is an object and `Object.constructor` to make sure the constructor is equal to `Object`.

```js
const isPlainObject = val => !!val && typeof val === 'object' && val.constructor === Object;
```

```js
isPlainObject({ a: 1 }); // true
isPlainObject(new Map()); // false
```