runa/runa-std/actors/counter.rn

pub fn handle(state, message) {
    if message.op == "send" {
        (state + 1, [(message.target, #{op: "add", value: message.value})])
    } else if message.op == "add" {
        (state + message.value, [])
    } else {
        panic("unknown counter operation")
    }
}