IGNORE- Get value of variable from function for use in another function (JavaScript)

Question

I know this must have been asked before as it is a very simple question, however I cannot get a clear answer.

How do I get the value of a variable from a function in to another function?

var x = 0;
function firstFunc(){
    x = 1
}

function secondFunc(){
    alert(x);
}

Thank you

It is not clear what you are asking... In your actual case, since your variable is globally scoped, it is modifiable and possible to get within both functions.. — Ulysse BN, Aug 19 '17 at 17:57

score 1 · Accepted Answer · answered Aug 19 '17 at 17:59

1

Exactly like you did. You declared x at the scope of the entire script, so other functions can evaluate it.

Calling both functions in the snippet below shows that the variable was changed by function 1 and evaluated with its new value at function 2:

var x = 0;
function firstFunc(){
    x = 1
}

function secondFunc(){
    alert(x);
}
firstFunc();
secondFunc();

answered Aug 19 '17 at 17:59

Koby Douek

16,156
19
74
103

Apologies and thank you...realised it was an issue in my other code that was not working. Sorry for wasting your time haha – Ed Corke Aug 19 '17 at 18:27

score 0 · Answer 2 · answered Aug 19 '17 at 17:58

You are already getting the value of "x" across both functions. You are just not calling the functions to prove it.

Take a look at this article for more information on global variables

var x = 0;
function firstFunc(){
    x = 1
}

function secondFunc(){
    alert(x);
}
firstFunc();
secondFunc();

score 0 · Answer 3 · answered Aug 19 '17 at 17:58

0

You have several ways to do that one of them is making the first function return the variable and in the second function you can use this variable

var x = 0;
function firstFunc(){
    return x = 1
}

function secondFunc(){
    x= firstFunc();
    alert(x);
}

answered Aug 19 '17 at 17:58

wahdan

1,208
3
16
26

Your function doesn't need to return anything because x = 1 is already being defined – Assafi Cohen-Arazi Aug 19 '17 at 18:02
@AssafiCohen-Arazi well , if you removed it and call secondFunc() x will be undefined – wahdan Aug 19 '17 at 18:12

Karthik Samyak · Answer 4 · 2017-08-19T18:27:49.063

0

Do you mean to get a local variable declared inside the function scope? if so, one way is to call the function inside a function, so we get the variable declared inside the function scope.

x = 0;
function firstFunc(){
   var x = 1;
   secondFunc();
}

function secondFunc(){
   alert(x);
}

edited Aug 19 '17 at 18:27

answered Aug 19 '17 at 18:02

Karthik Samyak

467
2
8
19

score 0 · Answer 5 · answered Aug 19 '17 at 18:07

0

Are expecting alert should show 1 ?? This already working like that only. Check this link

http://ztoi.blogspot.in/2017/08/get-value-of-variable-from-function-for.html

answered Aug 19 '17 at 18:07

Karthick Aravindan

1,042
3
12
19

score 0 · Answer 6 · answered Aug 19 '17 at 18:47

With your current code, you are already able to get the value of the variable x across both functions.

This is possible because the x is defined as global so it can read and set by both functions.

Interesting question to learn more about js scope.

var x = 0;
function firstFunc(){
    x = 1
}

function secondFunc(){
    alert(x);
}

firstFunc();
secondFunc();

IGNORE- Get value of variable from function for use in another function (JavaScript)

6 Answers6