Proposal: Syntax sugar for single exit and early exit functions.

[Jeremy Martin]

OH JEEZ. Please ignore previous email.

On Mon, Nov 17, 2014 at 12:00 PM, Jeremy Martin <jmar777 at gmail.com> wrote:

> `validate: { ... }`
>
> Is that an ES7 feature? I don't recognize it from ES6, and can't seem to
> find a relevant proposal with that syntax...
>
> On Mon, Nov 17, 2014 at 11:51 AM, Andreas Rossberg <rossberg at google.com>
> wrote:
>
>> On 17 November 2014 17:29, Alex Kocharin <alex at kocharin.ru> wrote:
>> > 17.11.2014, 03:07, “Biju” bijumaillist at gmail.com:
>> >> I wish, I could write elegant two of the code pattern I use frequently.
>> >> [...]
>> >> Patten 2.
>> >> I do like to code functions with early exit, like
>> >>
>> >> function someValidationProcess(){
>> >>
>> >>     doStuff();
>> >>     if(condition_1()){
>> >>         doCleanUp_1();
>> >>         doCleanUp_2();
>> >>     }
>> >>
>> >>     doAnotherStuff();
>> >>     if(condition_2()){
>> >>         doCleanUp_1();
>> >>         doCleanUp_2();
>> >>      }
>> >>
>> >>     doYetAnotherStuff();
>> >>     if(condition_3()){
>> >>         doCleanUp_1();
>> >>         doCleanUp_2();
>> >>      }
>> >>
>> >>     doMoreStuff();
>> >>     doCleanUp_1();
>> >>     doCleanUp_2();
>> >> }
>>
>> Sounds like you would like to have monad comprehension syntax. :)
>>
>> > How about a loop?
>> >
>> > function someValidationProcess() {
>> >   do {
>> >     doStuff()
>> >     if (condition_1()) break
>> >
>> >     doAnotherStuff()
>> >     if (condition_2()) break
>> >
>> >     doYetAnotherStuff()
>> >     if (condition_3()) break
>> >
>> >     doMoreStuff()
>> >   } while(0)
>> >
>> >   doCleanUp_1()
>> >   doCleanUp_2()
>> > }
>>
>> No need for a fake loop:
>>
>> function someValidationProcess() {
>>    validate: {
>>      doStuff()
>>      if (condition_1()) break validate
>>      doOtherStuff()
>>      if (condition_2()) break validate
>>      // etc.
>>    }
>>    doCleanUp_1()
>>    doCleanUp_2()
>>  }
>>
>> But I'd rather use a separate function for the clean-up.
>>
>> /Andreas
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>>
>
>
>
> --
> Jeremy Martin
> 661.312.3853
> http://devsmash.com
> @jmar777
>



-- 
Jeremy Martin
661.312.3853
http://devsmash.com
@jmar777
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