syntax for case ranges

Mark S. Miller erights at gmail.com
Sat Feb 1 17:41:49 UTC 2020


3 < 2 < 1;  // true


On Sat, Feb 1, 2020 at 3:03 AM Naveen Chawla <naveen.chwl at gmail.com> wrote:

> Certain languages allow the expression 0<x<5. Does anybody know if this
> would be syntactically possible in JavaScript? Of course this would only
> apply for "if"/"while" statements.
>
> On Fri, 31 Jan 2020 at 22:41, Isiah Meadows <contact at isiahmeadows.com>
> wrote:
>
>> Still better to discuss it there - it's highly related to your
>> suggestion. And I'm pretty sure an issue already exists related to that.
>>
>> On Fri, Jan 31, 2020 at 09:06 Sultan <thysultan at gmail.com> wrote:
>>
>>> The pattern matching proposal does not handles the mentioned case:
>>>
>>> switch(type) { case 0...5: } being the equivalent of switch(type) { case
>>> 0: case 1: case 2: case 3: case 4: case 5: }
>>>
>>> On Fri, Jan 31, 2020 at 7:36 PM Bruno Macabeus <bruno.macabeus at gmail.com>
>>> wrote:
>>>
>>>> I agree with Oriol.
>>>> We already have the proposal pattern matching, that has a very similar
>>>> effect.
>>>> I think that is better to improve pattern matching proposal in order to
>>>> be able to match using ranges (or at least check if it's good to do)
>>>> instead of create a new proposal.
>>>>
>>>> On Fri, 31 Jan 2020 at 14:08, Oriol _ <oriol-bugzilla at hotmail.com>
>>>> wrote:
>>>>
>>>>> This sounds like https://github.com/tc39/proposal-pattern-matching
>>>>>
>>>>> El 31/1/20 a les 10:57, Sultan ha escrit:
>>>>>
>>>>> For example, the following:
>>>>>
>>>>> switch (value) {
>>>>>     case 0...9: break
>>>>>     case 'a'...'z': break
>>>>> }
>>>>>
>>>>>
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>>>>>
>>>>>
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>> --
>> -----
>>
>> Isiah Meadows
>> contact at isiahmeadows.com
>> www.isiahmeadows.com
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-- 
  Cheers,
  --MarkM
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