I like the idea, and I generally agree that your proposal would increase readability, but I'm not a fan of the colon in parenthesis. In this context, the colon looks like it should represent a member assignment of 'b' to 'a'.
-Ryan Birmingham On 1 February 2017 at 11:27, Felipe Nascimento de Moura < [email protected]> wrote: > Hi. > > I wonder if there is already a proposal for such thing or if it would be > something interesting to be proposal: > > *The motivation:* > Let's say you have an object whose property you want to compare to 'a' or > 'b': > > ``` > if (object.property.secondProp === 'a' || object.property.secondProp === > 'b') { > // do something > } > ``` > > *The proposal:* > Now, with this syntax you would be able to perform such comparisons in a > much simpler, better to read approach: > > ``` > if (object.property.secondProp === ('a' : 'b')) { > // do Something > } > ``` > > And with the advance of the Optional Chaining Operator > <https://github.com/claudepache/es-optional-chaining> proposal, it would > get even better, like so: > > ``` > // this: > if (object && > object.property && > (object.property.secondProp === 'a' || > object.property.secondProp === 'b')) { > // ... > } > > // becomes this: > if (object?.property?.secondProp === ('a' : 'b')) { ... } > ``` > > *Alternatives:* > I do know that we could accomplish that with other techniques, like: > > ``` > ['a', 'b'].includes(object.property.secondProp) > ``` > > I just think it might be counterintuitive and having a syntax for a "short > comparing" would be better for reading and understanding. > > Would make ternary comparison even shorter, too: > > ``` > let currentState = object.property.status === ('fail' : 'ok') ? 'done' : > 'doing' > ``` > > Please let me hear your thoughts on that :) > > Regards. > > > > > > > > _______________________________________________ > es-discuss mailing list > [email protected] > https://mail.mozilla.org/listinfo/es-discuss > >
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