Add Slice.RemoveAt(index int) function to pdata

[tigrannajaryan]

Is your feature request related to a problem? Please describe.
I need to remove an element from a slice.

Describe the solution you'd like
RemoveAt(index int) would be a nice addition to slices.
Alternatively call it Delete and have Delete(i, j int) to match semantics of slices.Delete.

Describe alternatives you've considered
I can use RemoveIf and count until the desired index but it is needlessly complex and slow.

[bogdandrutu]

Trying to better understand:
How do you know which element to remove?

[tigrannajaryan]

I iterate and check adjacent slice elements for certain condition, then combine data in adjacent elements and delete the item with the index found.

I can of course rewrite it using RemoveIf but the code is convoluted and error prone. Compare this:

for i:=0; i<s.Len()-1; i++ {
	if foo(s.At(i), s.At(i+1)) {
		// do some actions to combine s.At(i) and s.At(i+1)
		...
		s.RemoveAt(i)
		break
	}
}

with:

i := 0
done := false
s.RemoveIf(
	func(e ElementType) bool {
		i++
		if done || i >= s.Len() {
			return false
		}
		if foo(e, s.At(i)) == 0 {
			// do some actions to combine e and s.At(i)
			...
			done := true
			return true
		}
		return false
	},
)

Maybe there is a simpler way?

[sfc-gh-bdrutu]

I don't know of a simpler way and I agree it is not nice, but I also find this a bit of an edge case that does not work with "RemoveIf". For this, I would like to have 1-2 more use-case where RemoveIf doesn't work before adding a new API.

[tigrannajaryan]

For this, I would like to have 1-2 more use-case where RemoveIf doesn't work before adding a new API.

Sounds good. I will add more comments if I encounter more uses cases.