Also, this particular use case could be addressed by adding an equivalent of the stage 3 optional chaining operators to the proposed pipeline operator: https://github.com/tc39/proposal-pipeline-operator.
In this light, I've also filed an issue there: https://github.com/tc39/proposal-pipeline-operator/issues/159 ----- Isiah Meadows [email protected] www.isiahmeadows.com On Thu, Nov 14, 2019 at 4:21 AM Cyril Auburtin <[email protected]> wrote: > > the `do` operator might be good enough > > ```js > const z = do { const z = x?.y?.z; z ? doSomethingWithValue(z) : null; }; > ``` > > On Wed, Nov 13, 2019 at 3:48 PM Claude Pache <[email protected]> wrote: >> >> >> >> Le 13 nov. 2019 à 03:43, devlato <[email protected]> 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 >> 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 >> _______________________________________________ >> es-discuss mailing list >> [email protected] >> https://mail.mozilla.org/listinfo/es-discuss > > _______________________________________________ > es-discuss mailing list > [email protected] > https://mail.mozilla.org/listinfo/es-discuss _______________________________________________ es-discuss mailing list [email protected] https://mail.mozilla.org/listinfo/es-discuss
