Proposal for variable keys: a.["b"].["c"].["d"]
On Thu, Oct 29, 2015 at 3:32 PM, Eli Perelman <[email protected]> wrote: > 2 dots may be problematic when parsing numbers (yeah, I know it's probably > not common, but it's still valid): > > 3..toString() > > Eli Perelman > > On Thu, Oct 29, 2015 at 1:29 PM, Sander Deryckere <[email protected]> > wrote: > >> >> >> 2015-10-29 19:22 GMT+01:00 Laurentiu Macovei <[email protected]>: >> >>> This would be amazing operator!! >>> >>> var error = a.b.c.d; //this would fail with error if a, b or c are null >>> or undefined. >>> var current = a && a.b && a.b.c && a.b.c.d; // the current messy way to >>> handle this >>> var typeScript = a?.b?.c?.d; // The typescript way of handling the above >>> mess with no errors >>> >>> However I propose a more clear one - as not to confuse ? from the a ? b >>> : c statements with a?.b statements: >>> >>> var x = a..b..c..d; //this would be ideal to understand that you assume >>> that if any of a, b, c is null or undefined the result will be null or >>> undefined. >>> >>> Two dots, means if its null or undefined stop processing further and >>> assume the result of expression is null or undefined. (as d would be null >>> or undefined). >>> >>> Two dots make it more clear, more visible and more space-wise so you >>> understand what's going on. >>> >>> What do you think folks? >>> >>> >> Do you also have a proposal on how to handle a["b"]["c"]["d"], so with >> possibly variable keys. >> >> In any case, I think that the existential operator (whatever the exact >> sign used is) will be better then the current way of chaining &&. >> >> Regards, >> Sander >> >> >> _______________________________________________ >> 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 > >
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