microsoft / microsoft/TypeScript
Provide refactor to convert `[].forEach` to `for`/`for of` (And convert back)
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Description
Suggestion
🔍 Search Terms
refactor, iterator, for
List of keywords you searched for before creating this issue. Write them down here so that others can find this suggestion more easily and help provide feedback.
✅ Viability Checklist
My suggestion meets these guidelines:
- This wouldn't be a breaking change in existing TypeScript/JavaScript code
- This wouldn't change the runtime behavior of existing JavaScript code
- This could be implemented without emitting different JS based on the types of the expressions
- This isn't a runtime feature (e.g. library functionality, non-ECMAScript syntax with JavaScript output, new syntax sugar for JS, etc.)
- This feature would agree with the rest of TypeScript's Design Goals.
⭐ Suggestion
Provide refactor to convert [].forEach to for/for of (And convert back)
📃 Motivating Example
[].forEach((value, index) => {
console.log(value, index)
})
// to
var arr = []
for (let index = 0; index < arr.length, index++) {
let value = arr[index]
console.log(value, index)
}
// or
for (let index of []) {
console.log(value) // disallow index here
}
💻 Use Cases
Contributor guide
First steps
- Read the whole issue, then the project's contributing guide.
- Comment on the issue to say you are picking it up — it saves two people doing the same work.
- Fork the repository and make your change on a branch.
- Open a pull request that references the issue number.
Research direction
No repository files, tests, or entry points are named; start by reviewing the suggestion and its examples. Clarify the supported conversions, scope, and behavior before locating the relevant TypeScript refactor entry point. Done means an agreed proposal with coverage for both conversion directions.
Written by the indexing model from the issue text.
Assessment
- Tech stack
- javascript, typescript
- Domain
- tooling
- Issue type
- Feature
- Difficulty
- 5/5
- Estimated time
- Over a week
- Activity status
- Stale
- Clarity
- Needs clarification
- Newbie friendliness
- 25/100