Proposal: Declaring an enum restricted by a number,string or boolean set #3105

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1. Jon (jbondc)

   changed the title [-]Proposal: Declarating a enum restricted by a set of number/numeric literals[/-] [+]Proposal: Declarating an enum restricted by a set of number/numeric literals[/+] on May 10, 2015
2. Jon (jbondc)

   changed the title [-]Proposal: Declarating an enum restricted by a set of number/numeric literals[/-] [+]Proposal: Declaring an enum restricted by a set of number/numeric literals[/+] on May 11, 2015
3. danquirk commented on May 11, 2015

   

   Dan Quirk (danquirk)

   on May 11, 2015

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   I'm not sure this adds enough value for the complexity it introduces. Are there any other languages that support this kind of feature? It just adds bounds checking to numeric enums but doesn't scale to other enum spaces. We've had requests for string based enums for example which couldn't use this, we use bit flag enums ourselves a lot, and it's not unreasonable to imagine 'illegal' values within a contiguous bound which this wouldn't protect against.
4. Dan Quirk (danquirk)

   added

   SuggestionAn idea for TypeScriptAn idea for TypeScript

   on May 11, 2015
5. Jon (jbondc)

   changed the title [-]Proposal: Declaring an enum restricted by a set of number/numeric literals[/-] [+]Proposal: Declaring an enum restricted by a number,string or boolean set[/+] on May 12, 2015
6. jbondc commented on May 13, 2015

   

   Jon (jbondc)

   on May 13, 2015

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   Dan Quirk (@danquirk) About your mention of other languages, made a weird discovery Pascal has 'set types':
   http://en.wikipedia.org/wiki/Pascal_(programming_language)#Set_types

   Updated the proposal with links. This should be super familiar to Anders Hejlsberg (@ahejlsberg) 😮
7. Gaelan commented on Sep 23, 2015

   

   Gaelan Steele (Gaelan)

   on Sep 23, 2015

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   Dan Quirk (@danquirk) "a" | "b" | "c" syntax would be insanely helpful for writing .d.ts files (lots of JS libraries use magic strings).
8. Mohamed Hegazy (mhegazy)

   added

   Needs ProposalThis issue needs a plan that clarifies the finer details of how it could be implemented.This issue needs a plan that clarifies the finer details of how it could be implemented.

   on Dec 9, 2015
9. Jon (jbondc)

   closed this as completedon Dec 10, 2015
10. Gaelan commented on Dec 10, 2015

    

    Gaelan Steele (Gaelan)

    on Dec 10, 2015

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    Jon (@jbondc) Why the withdrawal? This was a good idea.
11. jbondc commented on Dec 11, 2015

    

    Jon (jbondc)

    on Dec 11, 2015

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    Gaelan Steele (@Gaelan) I'm sure the TS team will come up with something. I've left the link to set types, maybe they will call it collection types or something. When philosophies diverge too much, it's best to part ways.
12. microsoft

    locked and limited conversation to collaborators on Jun 19, 2018