A Tour of Go: Fibonacci closure solution

fibonacci_closure.go

package main

import "fmt"

// fibonacci is a function that returns
// a function that returns an int.
func fibonacci() func() int {
    a,b := 0,1
    return func() int{
        res := a
        tmp := b+a
        a, b = b,tmp
        return res
    }
}

func main() {
    f := fibonacci()
    for i := 0; i < 10; i++ {
        fmt.Println(f())
    }
}

Ok, no need for a temp var and can be further compacted

package main

import "fmt"

// fibonacci is a function that returns
// a function that returns an int.
func fibonacci() func() int {
    a,b,res := 0,1,0
    return func() int{
        res, a, b = a, b, b+a
        return res
    }
}

func main() {
    f := fibonacci()
    for i := 0; i < 10; i++ {
        fmt.Println(f())
    }
}