Return array from Node.js function

Question

I'd like to read some information from an remote CSV file using a callback function. Not sure, how exactly to do this.

function:

function getRoomsFromCSV(allRoomsArray) {
  var request = require('request');
  request('http://localhost:3333/rooms.csv', function (error, response, body) {
    if (!error && response.statusCode == 200) {
...
      allRoomsText = allRoomsText.substr(0,allRoomsText.length-1) + ']}';
      var allRoomsArray = JSON.parse(allRoomsText);
  }
 })
}

I'd like to call the function and loop through the result array.

 var rooms = [];
 getRoomsFromCSV( function (rooms) {
   for(var i = 0; i < rooms.length; i++) {
      console.log("i:",i);
  }

However, the for loop is never called and the result (room) seems to be empty.

You are re declaring var allRoomsArray

Jyothi Babu Araja
– Jyothi Babu Araja

2017-01-16 11:37:32 +00:00
Commented Jan 16, 2017 at 11:37 — Jyothi Babu Araja
– Jyothi Babu Araja, Commented Jan 16, 2017 at 11:37

Jyothi Babu Araja · Accepted Answer · 2017-01-16 11:40:29Z

1

Try like this

function getRoomsFromCSV(allRoomsArray) {
  var request = require('request');
  request('http://localhost:3333/rooms.csv', function (error, response, body) {
    if (!error && response.statusCode == 200) {
...
      allRoomsText = allRoomsText.substr(0,allRoomsText.length-1) + ']}';
      allRoomsArray(JSON.parse(allRoomsText)); //response params to callback
  }
 })
}

You sent callback to retrieve response. so call that callback inside the async function

answered Jan 16, 2017 at 11:40

Jyothi Babu Araja

10.3k3 gold badges33 silver badges41 bronze badges

Sign up to request clarification or add additional context in comments.

1 Comment

jpsstack Over a year ago

thx, that was it! However, rooms.length is undefined, although it has a value when I watch the rooms variable in the debugger

Collectives™ on Stack Overflow

Return array from Node.js function

1 Answer 1

1 Comment

Your Answer

Hot Network Questions

Collectives™ on Stack Overflow

1 Answer 1

1 Comment

Your Answer

Sign up or log in

Post as a guest

Related