imperative.js

/**
 * @author Oleg Kubrakov yellowred.github.com
 * @since 2017
 **/

const Promise = require('Bluebird')
const jwt = require('jsonwebtoken');


let generateOneTimeToken = (value) => {
  // we use promise to stub a request to MongoDB
  let token = jwt.sign({ value }, 'privkey');
  return Promise.resolve({value, token});
}

let data = [
  {
    name: "Michelle Rung",
    contacts: [
      { phone: "7281681726" },
      { emailAddress: "michelle@gmail.com" },
      { emailAddress: "michelle@gmail.com" },
      { emailAddress: "" }
    ]
  },
  {
    name: "Johann Sigh",
    contacts: [
      { phone: "7812787-2667" },
      { emailAddress: "johann@gmail.com" },
      { emailAddress: "johann-md@gmail.com" }
    ]
  }
]

let generateResponse = (data) => {
  return Promise.coroutine(function* () {
    let electronicContacts = []
    let tmpArray = []

    for (let dataValue of data) {

      for (let individualValue of dataValue.contacts) {

        if (individualValue.emailAddress && tmpArray.indexOf(individualValue.emailAddress) < 0) {
          let tokenObject = yield generateOneTimeToken(individualValue.emailAddress)
          electronicContacts.push({
            electronicAddress: individualValue.emailAddress,
            token: tokenObject.token
          })
          tmpArray.push(individualValue.emailAddress)
        }

      } // end for (let individualValue of dataValue.individualAddress)

    }

    return electronicContacts
  })()
}
generateResponse(data).then(console.log)