The Eiger Programming Language

class User {
    let email
    let status

    func new(email, status) {
        this.email = email
        this.status = status
    }
}

func getActiveUserEmails(users) {
    func isActive(user) > user.status ?= "active"

    let readonly activeUsers = filter(users, isActive)
    let readonly emails = map(activeUsers, func(user) > user.email)

    ret emails
}

let readonly emails = getActiveUserEmails(fetchUsers())

for i = 0 to emails.length emitln(fmt("Active User #%1 => %2", i + 1, emails[i]))