Using tuples proposal: arr[#[a,b]] instead of arr[a:b]

[caub]

The benefit is to not introduce new syntax

Tuple proposal: https://github.com/tc39/proposal-record-tuple

This idea comes from @brigand

What do you guys think about using tuples notation for this proposal? They'd be used in arrays property accessors, and return a slice

[ljharb]

Assuming Tuples already existed, that would already be the same as:

const t = #[a, b];
arr[t]

iow, inside the brackets, any expression is already legal - so the only syntactic options are something that’s a syntax error already in expression position. So, for your syntax to work, Tuple syntax wouldn’t be able to.

[caub]

@ljharb arr[#[0,2]] would be valid syntax when tuple are added in the spec. I was thinking that the spec could then allow a special behavior for array[tuple] since tuples are new, there would be no backward-compatibility issues.

But after more thoughts, this syntax is heavy anyway, it doesn't look that appealing

[ljharb]

There would be consistency issues, though.

[caub]

ok, thanks, closing