> Le 13 nov. 2019 à 03:43, devlato <ec...@devlato.com> a écrit :
>
> Hey folks,
>
> not sure if you haven't discussed something similar, but what do you think
> about making an enhancement for the ternary operator, to make it more
> powerful?
> I've created a small explanatory doc on GitHub:
> https://github.com/devlato/proposal-ternary-placeholder
>
> Warmest regards,
> Denis
>
The generic problem is: you do some computation, and you want to reuse the
result of that computation later.
The generic solution is to use a temporary variable:
```js
// declare a temporary variable at the top of some scope
var _;
// later, use it:
const X = () => (_ = x?.y?.z) ? doSomethingWithValue(_) : null;
```
Now, you are not satisfied with the existing solution, and you want to avoid
declaration of temporary variables in some outer scope...? Maybe:
```js
const X = () => (#1 = x?.y?.z) ? doSomethingWithValue(#1) : null;
```
(Any similarity with
https://developer.mozilla.org/en-US/docs/Archive/Web/Sharp_variables_in_JavaScript
<https://developer.mozilla.org/en-US/docs/Archive/Web/Sharp_variables_in_JavaScript>
is not at all fortuitous.) However, I’m not convinced that the need to declare
your temporary variables is such a problem that it is worth the introduction of
new syntax.
—Claude
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