> For the complete documentation index, see [llms.txt](https://michaljach.gitbook.io/rapid/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://michaljach.gitbook.io/rapid/language/variables.md).

# Variables \[proposal]

### Example variable declaration

Variable must be of one of known [Types](/rapid/language/types.md).

{% tabs %}
{% tab title="example.rapid" %}

```javascript
let test = 12
```

{% endtab %}
{% endtabs %}

{% tabs %}
{% tab title="example.rapid" %}

```javascript
let users: string[] = ['Annie', 'John']
```

{% endtab %}
{% endtabs %}

{% hint style="info" %}
You don't need to declare variable type for basic types like numbers and strings - they are inferred automatically. Type declaration is necessary in complex data structures like `Arrays`, `Sets` etc.
{% endhint %}

### Definition

{% tabs %}
{% tab title="Definition" %}

```javascript
 let <variable_name>: <type>? = <value>
```

{% endtab %}
{% endtabs %}