Any interest in `collect`/`collectFirst`?

[adamhamlin]

Two of my favorite utility functions from the Scala programming language are collect and collectFirst. I think these would make a great addition to the library.

• collect -- a map+filter combo where, if the result of the mapping function is undefined, that element is filtered out:

  radash.collect([{a: 1}, {b: 2}, {a: 3}], (el) => el.a) // result: [1, 3]

• collectFirst -- same as above, but the first defined result is returned immediately:

  radash.collectFirst([{a: 1}, {b: 2}, {a: 3}], (el) => el.a) // result: 1

They are essentially more generalized versions of filter and find, where you get the opportunity to transform the value(s) at the same time. collect ends up being a very nice alternative when you don't want to iterate twice but using reduce just feels like too much.

@rayepps would you be interested in a PR for these additions?

[sodiray]

Sorry for the long delay @adamhamlin 🙃 These are interesting functions, we do haveselect which is a little similar to collect but I do see the difference.

If you're still interested in making a PR for these I'd be happy to take a look and bring them into radash.

[adamhamlin]

@rayepps I never lost hope, no worries! And yep, I saw select but I think the semantics of collect are a little cleaner/easier to reason about, esp. since it only requires 1 function arg instead of 2. I also expect select would feel a little duplicative if you need to target the same nested property for both mapping and filtering.

But great, I'll go ahead and open a PR soon, thanks

[adamhamlin]

Opened https://github.com/rayepps/radash/pull/327 👍