Calling variables outside of a function in javascript

Question

I'm new to javascript and firebase. I would just like to ask if there is a chance to call my variables outside of my function?

Here is my sample code:

function gotData (data) {
  console.log(data.val())
  var promotions = data.val()
  var keys = Object.keys(promotions)
  console.log(keys)
  for (var i = 0; i < keys.length; i++) {
    var k = keys[i]
    var name = promotions[k].promotionName
    var description = promotions[k].description
    var validityFrom = promotions[k].validityPeriodFrom
    var validityTo = promotions[k].validityPeriodTo
    var dateCreated = promotions[k].dateCreated
    var dateUpdated = promotions[k].dateUpdated
    console.log(name, description, validityFrom, validityTo, dateCreated, dateUpdated)
  }
}

Can I call name, description, validityFrom, etc outside of the function gotData? I'll appreciate a help. Thank you in advance! :)

Short answer: no. Here is a page about "variable scope": https://www.w3schools.com/js/js_scope.asp — ADreNaLiNe-DJ, Sep 13 '17 at 08:24
Can you show the code of `call my variables inside of a function outside of it`? — m00n, Sep 13 '17 at 08:24
@JudeAquino, you can create an array to get that values with global scope, check my answer — Jigar Shah, Sep 13 '17 at 08:48

Jigar Shah · Accepted Answer · 2017-09-13T08:44:14.280

Define variable as global variable

//above function
var name, description, validityFrom, validityTo, dateCreated, dateUpdated;
function gotData (data) {
  console.log(data.val())
  var promotions = data.val()
  var keys = Object.keys(promotions)
  console.log(keys)
  for (var i = 0; i < keys.length; i++) {
    var k = keys[i]
    name = promotions[k].promotionName
    description = promotions[k].description
    validityFrom = promotions[k].validityPeriodFrom
    validityTo = promotions[k].validityPeriodTo
    dateCreated = promotions[k].dateCreated
    dateUpdated = promotions[k].dateUpdated
    console.log(name, description, validityFrom, validityTo, dateCreated, dateUpdated)
  }
}
// now you can access variables here
console.log(name, description, validityFrom, validityTo, dateCreated, dateUpdated)

EDIT

You can create an array to get all variables as you may have multidimensional data

var objData = [];
function gotData (data) {

  console.log(data.val())
  var promotions = data.val()
  var keys = Object.keys(promotions)

  for (var i = 0; i < keys.length; i++) {
    var tempObj = [];
    var k = keys[i]
    tempObj['promotionName'] = promotions[k].promotionName;
    tempObj['description'] = promotions[k].description;
    tempObj['validityPeriodFrom'] = promotions[k].validityPeriodFrom;
    tempObj['validityPeriodTo'] = promotions[k].validityPeriodTo;
    tempObj['dateCreated'] = promotions[k].dateCreated;
    tempObj['dateUpdated'] = promotions[k].dateUpdated;

    objData.push(tempObj);
  }
  console.log(objData)
}

The values are assigned in a loop so they keep changing. This might not help much. — Mehravish Temkar, Sep 13 '17 at 08:28
Well, which ones from the loop he wants to access then, can't have it both ways — Dellirium, Sep 13 '17 at 08:29
An array should do the work. Not arrays of description, name, etc but multi dimensional array with indexes as description, name, etc. The array can be returned in the end of the function instead of global variables. — Mehravish Temkar, Sep 13 '17 at 08:32
This still can be improved as now it is difficult to figure out which one is the name or description — Mehravish Temkar, Sep 13 '17 at 08:37
added associative array code, but by doing this some array methods may not have accurate result :) — Jigar Shah, Sep 13 '17 at 08:46

Calling variables outside of a function in javascript

1 Answers1