# Array.sort

## Function

Sort the array. When no callback is passed, the order is sorted by the element string value; when the callback is passed, the order is determined by the number returned by the callback.

## Syntax

```bt
array.sort(callback)
```

## Parameters

| Parameters | Type | Required | Default value | Description |
| ------ | ------ | ------ | ------ | ------ |
| callback | Fn | No | None | The comparison function signature is fn(left, right), return less than or equal to 0 to maintain the order, return greater than 0 to exchange. |

## Return value

| Type | Description |
| ------ | ------ |
| Array | Returns the original array object. |

## Example

```bt
items = [3, 1, 2]
result = items.sort()

// Output: [1,2,3]
print result
```

## Notes

- This method will modify the original array.
- Callback sorting uses stable merge sorting.