`of` operator ES7 proposal from Ian Bicking
brendan at mozilla.org
Mon Mar 30 19:00:46 UTC 2015
Axel Rauschmayer wrote:
> * Name-wise, is `has` a possibility? It feels more intuitive and I
> don’t think the duality with `in` matters (given that `for-in` will
> probably rarely be used in the future, due to `for-of` and `Map`).
You don't want `has` for two reasons: it un-transposes operands back to
receiver has value, which is almost as long as, and less worth a special
form than, receiver.has(value) -- but that walks back into the has vs.
Second reason: the parallel is in : for-in :: of : for-of. That's why
the value goes on the left of the *operator*, the object (in method call
terms, receiver) on the right.
> * Will it ever be possible to define arbitrary infix operators? If
> yes, should this operator wait until that feature is available?
Again we don't wait for macros before adding syntax. Takes too long,
multiples risk, starves users of affordances.
People who know more about such things (dherman!) caution against ever
getting sweet.js support into the browser-staged runtimes. It's an AOT tool.
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