Server/internal/gentools/slices.go

package gentools

func IndexOf[T comparable](arr []T, value T) int {
	for i, v := range arr {
		if v == value {
			return i
		}
	}

	return -1
}

func AddUniques[T comparable](arr *[]T, values ...T) {
Outer:
	for _, v := range values {
		for _, v2 := range *arr {
			if v2 == v {
				continue Outer
			}
		}

		*arr = append(*arr, v)
	}
}