# while: repeating while a condition is true

[Syntax and values](README.md)

```text
let count = 3

while count > 0:
    say count
    set count = count - 1
```

The condition is evaluated before each iteration and must be `Boolean`. Each
iteration body has a fresh child scope. Use `set` on an outer variable to retain
changes between iterations.

There is no `break` or `continue` statement. Structure the condition or use a
function return when appropriate. Long-running cooperative loops should call a
positive `wait` so they remain responsive and receive a fresh instruction
budget slice.

## Example

```pliro
# language: en
let count = 3
while count > 0:
    say count
    set count = count - 1
```

## Related entries

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