# + — addition and concatenation

[Syntax and values](README.md)

## Behavior and details

The `+` operator works with two values. With Numbers it adds, with Text it joins the texts, and with Lists it makes a new outer list containing the items of both. Joining end to end is called **concatenation**. Both values must have the same one of these types. To join a number to text, first convert the number with `text`.

Here **binary** means “using two values,” such as the 2 and 3 in `2 + 3`. It does not mean writing numbers in zeros and ones. Multiplication groups before addition: `2 + 3 * 4` means `2 + (3 * 4)`. See [calculation order](expressions.md).

## Example

```pliro
# language: en
say 2 + 3 * 4
say "Pli" + "ro"
say([1, 2] + [3])
```

## Related entries

[Syntax and values](README.md) · [Built-ins](../builtins/README.md) · [Programming guides](../guides/README.md)