ericelliott/rtype

declaration-site variance annotations of generic type arguments

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#81 opened on Apr 14, 2016

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Description

Declaration-site variance annotations in other languages

C#, Kotlin, Ceylon:

  • out covariance
  • in contravariance

Scala, OCaml, Flow:

  • + covariance
  • - contravariance

What should we choose? (see discussion about generic types in #55 and #80)

Contributor guide

Research direction
Review variance annotations in C#, Kotlin, Scala, etc., and propose a syntax for rtype.
Tech stack
javascript
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None
Issue type
Research
DifficultyEstimated implementation difficulty for a new contributor, from 1 for very small changes to 5 for expert-level work.
3
Estimated timeA rough time range for an experienced contributor to investigate, implement, test, and prepare a pull request.
1-2 days
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Active
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Clear
Prerequisites
GenericsType systems
Newbie friendlinessA 1-100 score estimating how approachable this issue is for first-time contributors.
20