Couple nita about your argunents: 1. Most commonly used implementations don't close over more than what they have to. If `this` isn't used, it's not closed over. The addition of one more variable to check has so little overhead you won't gain anything.
2. Deprecating anything in JS is hard in general. The little-used `arguments.caller` itself was a challenge. Not TC39, but I strongly doubt this would have any traction for these + your additional justifications against. On Thu, Oct 25, 2018 at 06:59 manuelbarzi <[email protected]> wrote: > taking this old discussion back a bit ( > https://esdiscuss.org/topic/arrow-function-syntax-simplified), why > shouldn't be a good idea to deprecate the use of "function" in pro of > thin-arrow "->", being applicable in same cases (including named function)? > > just a bit of code with more about proposals: > > const GLOBAL_FACTOR = 2 > > const result = [1, 2, 3].map(function(value) { return GLOBAL_FACTOR * > value }) > > // PROPOSAL 1 - normal anonymous function (same as fat-arrow, but dynamic > binding, nothing much new here as from previous proposals): > // const result = [1, 2, 3].map(value -> GLOBAL_FACTOR * value) > > > function applyFactor(value) { > return GLOBAL_FACTOR * value > } > > // PROPOSAL 2 - named function declaration (without 'function' keyword): > // applyFactor(value) -> GLOBAL_FACTOR * value > > // referenced function (following PROPOSAL 1): > // const applyFactor = value -> GLOBAL_FACTOR * value > > const sameResult = [1, 2, 3].map(applyFactor) > > justification i read against this proposal is mainly that thin-arrow may > bring "more confusion" and may "provide poor or no benefit" co-existing > with fat-arrow. but having both may bring devs the chance to understand the > differences in the learning process as any other feature. the only "big > deal" would be to be aware of fix vs dynamic binding, which is something a > dev must understand sooner or later, independently of syntax (it can be > just explained with traditional function() {} and .bind() method). > > on the other hand it would bring the chance to avoid over-using fat-arrow > when binding it's not really necessary (which may "save" internal binding > processing too). > > finally, a simpler and shorter syntax avoiding the requirement of the > keyword 'function'. > > > _______________________________________________ > es-discuss mailing list > [email protected] > https://mail.mozilla.org/listinfo/es-discuss >
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