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https://issues.apache.org/jira/browse/JEXL-369?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17532407#comment-17532407
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Dmitri Blinov edited comment on JEXL-369 at 5/5/22 4:32 PM:
------------------------------------------------------------
In JS you may have a variable redeclared in nested block unlimited number of
times
{code:java}
let x = 1
{
let x = 2;
{
let x = 3;
}
// x = 2
}
// x = 1
{code}
In JEXL (like n java) it is not possible to declare a variable in nested block
if it has already been defined in outer block.
To illustrate how JS variables work lets consider the dummy example
{code:java}
var x = 1;
if (x === 1) {
let x = 2;
console.log(x);
// expected output: 2
{
// let x = 3;
var ddd =function() {return x = x +1}
let x = 4;
}
console.log(x)
console.log(ddd());
}
console.log(x);
// expected output: 1
console.log(ddd());
{code}
The output is 2, 2, 5, 1, 6
was (Author: dmitri_blinov):
In JS you may have a variable redeclared in nested block unlimited number of
times
{code:java}
let x = 1
{
let x = 2;
{
let x = 3;
}
// x = 2
}
x = 1
{code}
In JEXL (like n java) it is not possible to declare a variable in nested block
if it has already been defined in outer block.
To illustrate how JS variables work lets consider the dummy example
{code:java}
var x = 1;
if (x === 1) {
let x = 2;
console.log(x);
// expected output: 2
{
// let x = 3;
var ddd =function() {return x = x +1}
let x = 4;
}
console.log(x)
console.log(ddd());
}
console.log(x);
// expected output: 1
console.log(ddd());
{code}
The output is 2, 2, 5, 1, 6
> Add 'let' and 'const' variable declarations
> -------------------------------------------
>
> Key: JEXL-369
> URL: https://issues.apache.org/jira/browse/JEXL-369
> Project: Commons JEXL
> Issue Type: Improvement
> Affects Versions: 3.2.1
> Reporter: Henri Biestro
> Assignee: Henri Biestro
> Priority: Major
> Fix For: 3.3
>
>
> WHAT:
> Add creation of lexical scope variables, modifiable with 'let',
> non-modifiable through 'const'.
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