# Immutable Updates with "with"

Are you looking to update the value in an array but not change the original? Say hello to `with()`. The `with` function allows you to update a value in an array but return a copy with the updated value, not update the original. Pretty simple to use:

```javascript
const consoles = ["PS4", "Switch"]

const updatedConsoles = consoles.with(0, "PS5")
console.log(updatedConsoles) // [ 'PS5', 'Switch' ]
```

The `with` function has two parameters: the index you want to update and the value you want to update it with. Trying to update an index that is not in the array will throw a [range error](https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/RangeError). `with` is currently supported in all [major browsers](https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/RangeError) and is a handy function for immutable array transformations.