class World(pub name: String, pub color: String) end

fn getWorlds() -> List<World> = [
    World('Mercury', 'Red'),
    World('Earth', 'Blue'),
    World('Jupiter', 'Orange')
]

fn findWorldByColor(worlds: List<World>, color: String) -> String
    worlds.find { it -> it.color == color }
        .map { it -> it.name }
        .expect "No world has the given color ${color}"
end

fn main()
    let worlds = getWorlds()
    let blueWorld = findWorldByColor(worlds, 'Blue')
    println "Hello, ${blueWorld}!"
end