medium_prompt_article_1.js

'use strict';
const Promise = require("bluebird");
const readline = require('readline');

const rl = readline.createInterface(process.stdin, process.stdout, null);

//Some dummy data
const records = [{
    'title': null,
    'lat'  : 9.1111,
    'lng'  : 5.1111,
    'desc' : 'A record missing a title'
},{
    'title': "Not missing data",
    'lat'  : 9.1111,
    'lng'  : 5.1111,
    'desc' : 'Some description'
},{
    'title': null,
    'lat'  : 9.1111,
    'lng'  : 5.1111,
    'desc' : 'Another record missing a title with unicode chars (هذا نص عربي)'
}];

//This function when "await"ed should act as javascript blocking "prompt"
async function getUserInput(missing_record) {
    return new Promise( (resolve, reject) => {
        rl.question(`Missing data: ${missing_record.desc}, please input value \n`, (line) => {
            resolve(line);
        });
    });
}

//Loop through our data and prompt the user when records with empty title are encountered
async function processData() {

    for(const record of records) {
        if(!record.title) {
            //Execution will wait for user input and store it in record.title
            record.title = await getUserInput(record);
        }
        console.log(`Record title is ${record.title}`);
    }
    //Exit
    rl.close();
    process.stdin.destroy();
  
}

processData();