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# Fn
---
```text
Fn_class `alias Enum[.partial; .native; .process; .iterator; .closure; .bound; .regex]
Fn[Fn_class; RETURN_TYPE; ARGS; STATE; List]
```
## \`return
## Transient Union Return Chaining
# Iterating
## \`yield
Yielding wraps the value in the transient union `Next`
Return `Void` to stop iteration
```text
fn : Fn[n] $ ( @ 1 .. n { `yield 2 * x }[x] )
it : fn `call 10
// invoking
@ it { `log v }[v] // 2 4 6 8 10 12 14 16 18 20
// same as above
@ {
# `call it {
.value { `log v }[v]
.done { `break }
}
}
```
# Calling
## \`fork
```text
task : `fork fn
value : `wait task
```
## \`call
```text
fn `call args // `wait fn `task args
```
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