| .. | ||
| readme.mdx | ||
---
title: Store.setIfUnset()
---
The `Store.set()` method stores the value of `value` in the store under key
`key`, but only if that key does not already hold a value.
## Signature
```js
Store store.set(mixed key, mixed value)
```
:::tip
This method is chainable as it returns the `Store` object
:::
## Example
```js
const store = new Store()
store.set('example', 'Hi there')
store.setIfUnset('example', 'Hi again') // This has no effect
```