There was a suggestion that came up in my original reddit post that I think merits discussion here.
I know one of the main arguments against this new operator is to prevent needless and confusing language explosion, but u/notNullOrVoid pointed out that this bears similarity to another operator already under TC39 consideration, the pipeline-operator ( https://github.com/tc39/proposal-pipeline-operator). My suggestion could then be implemented as follows: const foo = getSomething() |> x => x ? dosomething(x) : doSomethingElse(); And this ternary could be simply a pipeline variant: const foo = getSomething() ?> x => dosomething(x) : doSomethingElse(); That reads much clearer and also takes care of the syntactically invalid ?! formularion. On Wed, 20 Sep 2017 at 14:22 Naveen Chawla <[email protected]> wrote: > As your example shows, for loops can be reduced to array reduction > function calls. `if` `else`s can be represented by ternaries. > > `while` loops aren't so straightforward but can be factored into single > function calls. They are less common anyway. > > I find single expressions listed as `(a, b, c)` more readable than code > blocks who eventually evaluate to a single value each. > > So, even if `do` expressions were introduced into ES, I would avoid using > them as much as I could, unless it were really smarter and more readable to > use them than any of the alternatives > > On Wed, 20 Sep 2017 at 16:11 T.J. Crowder <[email protected]> > wrote: > >> On Wed, Sep 20, 2017 at 11:28 AM, Naveen Chawla <[email protected]> >> wrote: >> > >> > The comma operator seems to make the `do` concept redundant, at >> > least for me. >> >> No, not at all. Again: With the comma operator, you can't use >> *statements*, only expressions. With the `do` expression, you can use >> actual statements: >> >> ```js >> const x = do { >> for (const x of getTheThings()) { >> if (x.id == something) { >> x.foo; >> } >> } >> }; >> ``` >> >> ...which is basically: >> >> ```js >> const x = getTheThings().find(x => x.id == something).foo; >> ``` >> >> ...except it doesn't throw if `find` returns `undefined`, and isn't a >> series of function calls. >> >> `do` expressions are basically to address overly-complex conditional >> expressions and IIFEs. >> More: https://gist.github.com/dherman/1c97dfb25179fa34a41b5fff040f9879 >> >> -- T.J. Crowder >> >> _______________________________________________ > es-discuss mailing list > [email protected] > https://mail.mozilla.org/listinfo/es-discuss >
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