es6 import-statements are effectively with-statements … actually, they're *async* with-statements, with no callback-handling and non-obvious dependency-resolution logic, for those of us trying to debug them when things go wrong.
On Aug 22, 2018 15:58, "Claude Pache" <[email protected]> wrote: > > > > Le 21 août 2018 à 21:20, Herbert Vojčík <[email protected]> a écrit : > > > > Hi! > > > > It would be nice to know if do expressions have some a chance, otherwise > some other syntax for let-in would be really helpful, especially now that > we have arrow functions. > > > > I would propose to use different variant of let (maybe also const): > > > > OP 1: > > > > let in a = b(), if (a) a.c(); > > > > OP 2: > > > > let in a = b(), if (a) c(a); > > > > Instead of > > const big = raw => { > > let cooked = cook(raw); > > return consumer => { > > // do things with consumer and cooked > > }; > > }; > > > > const big = raw => > > let in cooked = cook(raw), consume => { > > // do things with consumer and cooked > > }; > > > > In short, > > > > let in binding = expr, stmt|expr > > > > It may work for `const in` as well. > > > > Herby > > > > P.S.: Alternative syntax is "let a=3, b=4, ..., in foo(a,b,c,d)" but > this can only tell late if it is plain let-up-to-end-of-scope or > local-scope-let, so not sure if that may be a problem; OTOH you can chain > more of them and resembles classical let-in better. > > Please, don’t take it too seriously: but have you thought about > resuscitating the (in)famous `with` statement? > > ```js > const big = raw => > do with ({cooked: cook(raw)}) > consumer => { > // do things with consumer and cooked > };; > ``` > > And no the two ”;”s are not a typo: I need to end both the `with` > statement and the `const` declaration. > > But more seriously... those sorts of “clever” syntaxes (`let-in` or > `do-with` or whatever), apart from complicating the language, are in danger > of raising as much issues than they’re resolving; the double-semicolon > oddity is one of them. > > —Claude > > _______________________________________________ > es-discuss mailing list > [email protected] > https://mail.mozilla.org/listinfo/es-discuss >
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