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out of range index in a tuple magically works #5203

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out of range index in a tuple magically works#5203
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CommittedThe team has roadmapped this issueGood First IssueWell scoped, documented and has the green lightHelp WantedYou can do thisSuggestionAn idea for TypeScript
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Community (deprecated)

Description

@zpdDG4gta8XKpMCd
ZpdDG4gta (zpdDG4gta8XKpMCd)
opened on Oct 10, 2015
var x : [number, number] = [1, 2];
var y = x[2]; // expected a compile error, actual ok

By design, isn't it?

Activity

  1. Ryan Cavanaugh (RyanCavanaugh)
    added
    SuggestionAn idea for TypeScript
    In DiscussionNot yet reached consensus
    on Oct 12, 2015

  2. RyanCavanaugh commented on Oct 12, 2015

    @RyanCavanaugh
    Ryan Cavanaugh (RyanCavanaugh)
    on Oct 12, 2015
    Member

    It is currently per spec, but I don't think this behavior is desirable. This should probably be an error by some new rule.

  3. DanielRosenwasser commented on Oct 12, 2015

    @DanielRosenwasser
    Daniel Rosenwasser (DanielRosenwasser)
    on Oct 12, 2015
    Member

    Well the problem is that you're going to get that numeric index signature from Array<T>. There is another discussion about having an alternative interface for tuples at #4988 (comment).

  4. zpdDG4gta8XKpMCd commented on Oct 12, 2015

    @zpdDG4gta8XKpMCd
    ZpdDG4gta (zpdDG4gta8XKpMCd)
    on Oct 12, 2015
    Author

    I know guys you are trying your best, but I don't see an array, I only see a tuple which is not an array in a broad sense.

  5. falsandtru commented on Oct 14, 2015

    @falsandtru
    falsandtru (falsandtru)
    on Oct 14, 2015
    Contributor

    👍 This is invalid behavior.

  6. OliverJAsh commented on Dec 23, 2015

    @OliverJAsh
    Oliver Joseph Ash (OliverJAsh)
    on Dec 23, 2015
    Contributor

    I ran into exactly the same issue.

  7. Igorbek commented on Sep 19, 2016

    @Igorbek
    Igor Oleinikov (Igorbek)
    on Sep 19, 2016
    Contributor

    See proposal #6229

  9. Ryan Cavanaugh (RyanCavanaugh)
    added
    CommittedThe team has roadmapped this issue
    and removed
    In DiscussionNot yet reached consensus
    on Aug 6, 2018
  10. Ryan Cavanaugh (RyanCavanaugh)
    added this to the TypeScript 3.1 milestone on Aug 6, 2018
  11. Ryan Cavanaugh (RyanCavanaugh)
    added
    Help WantedYou can do this
    on Aug 6, 2018

  12. RyanCavanaugh commented on Aug 6, 2018

    @RyanCavanaugh
    Ryan Cavanaugh (RyanCavanaugh)
    on Aug 6, 2018
    Member

    Aleksey-Bykov the arc of language design is long but it bends toward justice. Accepting PRs

  13. zpdDG4gta8XKpMCd commented on Aug 6, 2018

    @zpdDG4gta8XKpMCd
    ZpdDG4gta (zpdDG4gta8XKpMCd)
    on Aug 6, 2018
    Author

    god works in mysterious ways

  14. Ryan Cavanaugh (RyanCavanaugh)
    modified the milestones: TypeScript 3.1, Community on Aug 8, 2018
  15. Ryan Cavanaugh (RyanCavanaugh)
    added
    Good First IssueWell scoped, documented and has the green light
    on Aug 8, 2018
  16. Ryan Cavanaugh (RyanCavanaugh)
    closed this as completedin #26292on Sep 5, 2018
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