> For the complete documentation index, see [llms.txt](https://trizen.gitbook.io/sidef-lang/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://trizen.gitbook.io/sidef-lang/programming_tasks/s/string_prepend.md).

# String prepend

```ruby
var str = 'llo!'
str.sub!(/^/, 'He')
say str
```

or

```ruby
var str = 'llo!'
str.prepend!('He')
say str
```

#### Output:

```
Hello!
```