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# Map.prototype.has()

The **`has()`** method returns a boolean indicating whether an element with the
specified key exists or not.

## Syntax

```js
has(key)
```

### Parameters

- `key`
  - : The key of the element to test for presence in the `Map` object.

### Return value

`true` if an element with the specified key exists in the `Map` object;
otherwise `false`.
