cycle

gleam add cycle@1

import cycle

pub fn main() -> Nil {
  echo cycle.start(with: #([], 0), run: fn(state) {
    let #(is, i) = state
    case i < 5 {
      True -> {
        let i = i + 1
        cycle.continue(#(list.prepend(is, i), i))
      }
      _ -> cycle.stop(is)
    }
  })

  // output: [5, 4, 3, 2, 1]
}

Further documentation can be found at https://hexdocs.pm/cycle.

Development

gleam run   # Run the cycle
gleam test  # Run the tests