I say let's hold off until JavaScript gets pattern matching support (assuming it does). It's rather limiting otherwise, and the use case IMHO doesn't really merit a new syntax for it.
On Thu, Sep 15, 2016, 15:47 Jeremy Martin <[email protected]> wrote: > > If yes ... why would anyone write that ? > > I think it would have to be "yes" (and that's probably just a contrived > example that doesn't demonstrate the usefulness). > > Slightly less contrived, I could see the value in this, though. E.g., > > ``` > router.get('/user', (req, res, next) => { > if (let user = req.session.user) { > // do stuff with user here > } else { > res.status(401).end(); > } > }); > ``` > > I don't think it works as cleanly with `var`, but `const` and `let` has > some nice precedence with for-statements. > > > On Thu, Sep 15, 2016 at 2:45 PM, Andrea Giammarchi < > [email protected]> wrote: > >> > if( let a = ( let b = 10 ) * 3 > 10 ) >> >> I've honestly no idea, at first/quick read, what the hell that would >> produce. >> >> Is `a` going to be just `true` ? 'cause if not, this proposal violates >> operator precedence. >> >> If yes ... why would anyone write that ? >> >> On Thu, Sep 15, 2016 at 7:30 PM, J Decker <[email protected]> wrote: >> >>> Why not more generally - allow let/var declarations in expressions? >>> >>> coming from a long and rich C background, I have no issues with the >>> existing mechanisms... but for those languages that do support variable >>> declarations in for loops; I've always wondered why not any expression? >>> >>> if( let a = ( let b = 10 ) * 3 > 10 ) >>> ... or ... >>> >>> c = (let a = b*d) >>> >>> granted, the scope is extremely limited in the last case... >>> >>> _______________________________________________ >>> 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 >> >> > > > -- > Jeremy Martin > 661.312.3853 > http://devsmash.com > @jmar777 > _______________________________________________ > es-discuss mailing list > [email protected] > https://mail.mozilla.org/listinfo/es-discuss >
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