fn map

use std.stream { map }

fn nums() -> stream<i32> {
  for i in 1..=3 { yield i }
}

fn main() io {
  var out: List<i32> = []
  for await x in nums() |> map(x => x * 10) { out.push(x) }
  print("{out}")
}

[10, 20, 30]