Generic sample function

[nevrome]

I would like to implement a generic sample function for arrays in V. The inspiration for this is base::sample() in R.

Related stackoverflow question: https://stackoverflow.com/questions/57997114/how-to-write-a-generic-sample-function-in-v

[Delta456]

Please check the reply.

[Delta456]

Templates still don't work because of module error.

[nevrome]

Thank you for helping me in this question @Delta456
Could you elaborate a little bit what is broken? Modules and Templates just don't work together atm?

The following independent code works:

import rand

fn main() {

  arr := [0].repeat(10)
  println(sample(arr, 5).str())


  arr2 := ["test"].repeat(10)
  println(sample(arr2, 5).str())

}

fn sample<T>(arr[] T, size int) []T {

  mut res := [arr[1]].repeat(size)
  for i := 0; i < size; i++ {
    res[i] = arr[rand.next(arr.len)]
  }

  return res

}

I can't really test the module version any more because I have an another issue with module building. I will open another issue for that.

[nevrome]

If you adjust your answer accordingly ([0].repeat(size) has to be changed to [arr[1]].repeat(size) or a more fancy solution to define the array type dynamically), then I will accept it and mark my question as solved.

[Delta456]

Thank you for helping me in this question @Delta456
Could you elaborate a little bit what is broken? Modules and Templates just don't work together atm?

The following independent code works:

import rand

fn main() {

  arr := [0].repeat(10)
  println(sample(arr, 5).str())


  arr2 := ["test"].repeat(10)
  println(sample(arr2, 5).str())

}

fn sample<T>(arr[] T, size int) []T {

  mut res := [arr[1]].repeat(size)
  for i := 0; i < size; i++ {
    res[i] = arr[rand.next(arr.len)]
  }

  return res

}

I can't really test the module version any more because I have an another issue with module building. I will open another issue for that.

There are some problems with public generics function and method. It is similar to vlang/v#2547 and vlang/v#2528

[nevrome]

There are some problems with public generics function and method. It is similar to vlang/v#2547 and vlang/v#2528

Ah - I see. Generics currently seem to be a hot topic anyway. I guess it's best to just wait until this is sorted out.

[Delta456]

As generics are back in the new backend. Your function works. Here my implementation of sample in V which is better.

[nevrome]

Excellent! Thanks for keeping me in the loop. I guess your module random is a better implementation of what I had in mind for this package, so I will deprecate it. Didn't touch this in many months.

[Delta456]

@nevrome You can improve and keep this. Someone will use it.

[nevrome]

Maybe I will come back to it eventually, but right now I have enough side projects. If you find some code in here that you find useful, then feel free to steal it. 😄

[Delta456]

@nevrome You should archive it for now. Don't forget to make more modules with V! Its way better now!!