# String.last_index_of

## Function

Returns the position of the last occurrence of the specified fragment.

## Syntax

```bt
string.last_index_of(needle)
```

## Parameters

| Parameters | Type | Required | Default value | Description |
| ------ | ------ | ------ | ------ | ------ |
| needle | Any | No | '' | The fragment to be found will be converted into a string first when called. |

## Return value

| Type | Description |
| ------ | ------ |
| Int | Returns the starting byte position if found; returns -1 if not found. |

## Example

```bt
text = 'bt-lang-bt'
result = text.last_index_of('bt')

// Output: 8
print result
```

## Notes

- The return value is calculated as a UTF-8 byte offset.