Python-style generators in Go

Question

I\'m currently working through the Tour of Go, and I thought that goroutines have been used similarly to Python generators, particularly with Question 66. I thought 66 looked co

Answer 1

Using channels to emulate Python generators kind of works, but they introduce concurrency where none is needed, and it adds more complication than's probably needed. Here, just keeping the state explicitly is easier to understand, shorter, and almost certainly more efficient. It makes all your questions about buffer sizes and garbage collection moot.

type fibState struct {
    x, y int
}

func (f *fibState) Pop() int {
    result := f.x
    f.x, f.y = f.y, f.x + f.y
    return result
}

func main() {
    fs := &fibState{1, 1}
    for i := 0; i < 10; i++ {
        fmt.Println(fs.Pop())
    }
}