How to access let variable outside a block in javascript?

Question

var x = 10;
{
    let x = 9;
    console.log(x)
}
console.log(x)

This logs 9 and 10

how to get a log as 10 and 10? how to access x declared outside the block?

There isn't any TypeScript in your question. Read about the let declaration in the JavaScript documentation about declarations and statements. — axiac
– axiac, Commented Jul 18, 2021 at 10:59
You use blocks to limit the scope of a variable. The main reason of a block is that x is not accessible outside the block. If you want to access a variable outside a bock, declare it outside the block. — user15388024
– user15388024, Commented Jul 18, 2021 at 10:59
Does this answer your question? Is there a way to access a shadowed variable in JavaScript? — FZs
– FZs, Commented Jul 18, 2021 at 11:11

Kamalakannan J · Accepted Answer · 2021-07-18 11:01:01Z

3

No, You can't access let variables outside the block, if you really want to access, declare it outside, which is common scope.

let x;
{
    x = 9
    console.log(x)
}
x = 10
console.log(x)

answered Jul 18, 2021 at 11:01

Kamalakannan J

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Comments

mk23 · Accepted Answer · 2021-07-18 11:07:29Z

0

let has block scope so it is scoped only inside the brackets. You can define it outside or use var instead of let keyword as below:

{
 var x = 10;
 console.log(x)
}
console.log(x)

With let keyword:

let x = 10;
{
 console.log(x)
}
console.log(x)

For detailed explanation about the variable scope refer this

answered Jul 18, 2021 at 11:07

mk23

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Anonymous Coder · Accepted Answer · 2021-07-18 11:25:30Z

0

you can use 'var' keyword instead of 'let', it can be accessed globally

{
    var x = 10;
    console.log(x)
}
console.log(x)

or in your solution you can also declare let outside the block and reassign it inside the block

 let x = 10;
 {
    x = 9
    console.log(x)
 }
 console.log(x)

answered Jul 18, 2021 at 11:25

Anonymous Coder

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