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Gleam decode Option

gleam add gledo
import gledo

pub fn main() {
  Some(123) |> dynamic.from |> gledo.decode_option // Ok(Some(123))

  None |> dynamic.from |> gledo.decode_option // Ok(None)

  123 |> dynamic.from |> gledo.decode_option // Error([DecodeError("Option", "Int", [])])

Further documentation can be found at

Why not stdlib dynamic.optional?

dynamic.optional from stdlib has permissive design and will successfully decode any value.
If need to have strict decoding for Option value only, feel free to use gledo


gleam run   # Run the project
gleam test  # Run the tests
gleam shell # Run an Erlang shell
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