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racket / rhombus

Rhombus programming language
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add `..=` for inclusive finite ranges #488

Closed usaoc closed 7 months ago

usaoc commented 7 months ago

The ..= operator has a precedent in Rust.

This PR also includes a commit that fixes suffix ...

mflatt commented 7 months ago

I like the idea of having a way to make an inclusive range, and the Rust choice of ..= (which I didn't know about) seems fine.

I had previously considered trying <expr> .. <expr> ~inclusive (and allowing <expr> .. <expr> ~exclusive to mean the same thing as <expr> .. <expr>), but I never got around investigating how well that would work with expression parsing. If it does work, I think it would be clearer to someone reading code — but I also expect that opinions will vary.

soegaard commented 7 months ago

For comparison Swift uses ..< for the half-open interval and ... for closed ranges.

https://developer.apple.com/documentation/swift/comparable/'.._(_:_:) https://developer.apple.com/documentation/swift/comparable/'...(_:_:)