racket/typed-racket

TR should provide a Dictionary type

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#31 opened on Feb 21, 2015

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good first issue

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Description

It would be nice if TR provided a built-in Dictionary type. At its simplest, it would just be (U (HashTable a b) (Listof (Pairof a b)), but vectors are also technically dictionaries.

Does TR's type system allow "specializations" of types? I.e. some way to define a special case for (Dictionary Integer b) that includes vectors?

Technically, dictionaries also include structures that implement gen:dict, but obviously generics don't exist in TR yet.

Contributor guide

Research direction
Study the existing dict interface in Racket and Typed Racket's type system. Look at how built in types like List and HashTable are defined in Typed Racket. Understand the specialization mechanism for types.
Tech stack
None
Domain
compilers
Issue type
Feature
DifficultyEstimated implementation difficulty for a new contributor, from 1 for very small changes to 5 for expert-level work.
4
Estimated timeA rough time range for an experienced contributor to investigate, implement, test, and prepare a pull request.
3-5 days
Activity statusHow available the issue appears right now: fresh, active, stale, blocked, or waiting on maintainer input.
Stale
ClarityHow clearly the issue explains the expected change, acceptance criteria, and next step.
Clear
Prerequisites
RacketTyped Racket
Newbie friendlinessA 1-100 score estimating how approachable this issue is for first-time contributors.
30