imperative_noloops.js

let generateResponse = (data) => {
  return Promise.coroutine(function* () {

    let emails = data
                    .map(getEmailsFromIndividual)

    return emails
  })()
}

let getEmailsFromIndividual = (individual) => {
    if (!Array.isArray(individual.contacts)) return []
    return individual
            .contacts
            .map(value => value['emailAddress'])
}