javascript - Get value from function in loop nodejs -


i'm newbie in javascript , node js. want compare 2 data based on mysql value.

what want loop pair of data -> get value db -> concat pair of data , value -> endloop

here's code

routes/masterdata.js

var masterdata = require('../models/masterdata'); var outputfile = {} (var = 0; < datafile.length; i++) {   if (datafile[i]['existing'] != null) {     (var x = 0; x < datafile.length; x++) {       var param = {         tech_row: datafile[i]['existing'],         tech_col: datafile[x]['new']       };        masterdata.comparedata(param, function(err, rows) {         console.log(rows);         outputfile.push({           value: rows         });       });     }   } }  console.log(outputfile);

models/masterdata.js

var masterdata = {   comparedata: function(param, callback) {     return db.query('select value sod_matrix tech_name_row = ? , tech_name_col = ?', [param.tech_row, param.tech_col], callback);    } }

my question how populate data function compare data array in loop?

var promise = require('bluebird'); var completed=[]; var masterdata = require('../models/masterdata'); var outputfile = []; //should array (var = 0; < datafile.length; i++) {   if (datafile[i]['existing'] != null) {     (var x = 0; x < datafile.length; x++) {       var param = {         tech_row: datafile[i]['existing'],         tech_col: datafile[x]['new']       };       completed.push(new promise(resolve, reject){         masterdata.comparedata(param, function(err, rows) {           if(err)           {             reject(err);           }           else           {             console.log(rows);             outputfile.push(rows); //that;s pretty enough             resolve();           }         });       });     }   } } promise.all(completed)  .then((res)  {    console.log(outputfile);  });

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