jashkenas/coffeescript

Grammar, Nodes: Class fields/class property initializers

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#4,552 opened on May 16, 2017

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 (24 comments) (1 reaction) (0 assignees)CoffeeScript (16,577 stars) (1,980 forks)batch import
enhancementhelp wanted

Description

We should be able to write the equivalent of

class C {
  b = 3;
  c = () => 4;
}

Can it be

class C
  b: 3
  c: () => 4;

or does the b property have different semantics?

Contributor guide

Tech stack
None
Domain
developer experience
Issue type
feature
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
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.
needs investigation
Prerequisites
CoffeeScript grammarCoffeeScript compiler internalsJavaScript class fields
Newbie friendlinessA 1-100 score estimating how approachable this issue is for first-time contributors.
20
Research direction
Investigate the CoffeeScript grammar definition for class declarations, likely in the 'src/grammar.coffee' file. Review existing implementation of class methods and understand how properties could be added. Read through the 24 comments on the issue to understand proposed syntax and semantics, and check for any linked issues or PRs that discuss property initializers.
Grammar, Nodes: Class fields/class property initializers · jashkenas/coffeescript#4552 | Good First Issue