I think it's trying to show a mapping operation for a generic container where the container values are of one type and the mapping function is allowed to return a container with values of a different type.
type MySlice []int
// Map maps from a slice of ints to a slice of float64s.
func (s MySlice) Map(f func(int) float64) []float64 {
var out []float64
for i := range s {
out = append(out, f(s[i]))
}
return out
}
From a quick search, this seems to be better explanation of this new 1.27 feature:
(That uses an example that seems similar in spirit to the Interactive Tour's example, but with a more useful type of a Stack[T] and corresponding explanation seem clearer.)
I think it's trying to show a mapping operation for a generic container where the container values are of one type and the mapping function is allowed to return a container with values of a different type.
Without generics, something along the lines of the following (with runnable example at https://go.dev/play/p/KHBI1uAhbO0):
From a quick search, this seems to be better explanation of this new 1.27 feature:https://www.gopherguides.com/articles/golang-generic-methods
(That uses an example that seems similar in spirit to the Interactive Tour's example, but with a more useful type of a Stack[T] and corresponding explanation seem clearer.)