Functional notation?

[littledan]

Pre-allocating an additional object for each RegExp match, when existing code does not use it, is likely to have some performance cost. Would it be OK to instead have an .offset() method (or start and end methods) on match objects, or is this too unergonomic?

[ljharb]

Can the engine not invisibly lazily allocate the array?

[littledan]

@ljharb Other lazy things that have been specified as such explicitly (e.g., the bound function in Intl methods) ended up not being implemented efficiently enough in some engines, and then libraries like Intl.js cached the result. I'd like to avoid this complexity in the future and do things more directly. Is a method that un-ergonomic here?

[ljharb]

Not that bad I think - but it's not an expensive operation, and I'd expect the result to be memoized - this seems like a lazy getter that replaces itself with a data property might be helpful?

[littledan]

This just sounds really complicated. What's the issue with a method?

[ljharb]

I don't think it's a big issue; it just seems weird.