x/exp/slices: add Map/Extract function

[cpu...@gmail.com]

Playing with 1.18 I've noticed that I can immediately replace pretty much all uses of https://github.com/thoas/go-funk with the new slices package. 

One common use case that I happen to have in the codebase quite a lot is extracting data from a slice of objects:

funk.Map(chargers, func(c easee.Charger) string { return c.ID })

I feel it would be nice to add something like that as part of slices:

func Map[From, To any](s []From, f func(From) To) []To {

res := make([]To, len(s))

for i, v := range s {

res[i] = f(v)

}

return res

}

Has this already been discussed?

Thanks,

Andi

[Carla Pfaff]

On Sunday, 20 March 2022 at 18:14:15 UTC+1 cpu...@gmail.com wrote:

Has this already been discussed?

Yes: https://github.com/golang/go/discussions/47203#discussioncomment-1005237