Javascript - how to get variable value from another function in different function

Question

I'm trying to get variable d value from function b in function e, but the result not value from function b. The result just from variable outside the function b.

var d = "maybe";
var a = 1;

function b() {
    if (a == 1) {
        var d = "yes";
    } else {
        var d = "no";
    }
}
b();

function e() {
console.log(d); //output maybe
}
e();

How do I get the result to be the value from function b, or equal to "yes"?

Inside your function b delete the var for parameter d, it should work. Do some search on the global and local variables. — zhiqiang huang, Feb 17 '18 at 23:58
Thanks @MikeMcCaughan. I really don't know if the keyword is scope of variable, but again thank you very much. — Ras, Feb 18 '18 at 00:11

score 0 · Answer 1 · answered Feb 18 '18 at 00:01

0

You only have to use the var keyword when you define the variable. If you want to change the variable afterwords, don't use var. If you do you'll actually be making a new variable inside the function. So the code you want is:

var d = "maybe";
var a = 1;

function b() {
    if (a == 1) {
        d = "yes";
    } else {
        d = "no";
    }
}
b();

function e() {
    console.log(d); // now it outputs yes
}
e();

answered Feb 18 '18 at 00:01

Anonymous

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12

Yes, that was my mistake. Thank you very much.. – Ras Feb 18 '18 at 00:16

Javascript - how to get variable value from another function in different function

1 Answers1