Implement Fibonacci sequence with GO closure

fibonacci.go

package main

import (
    "fmt"
)

// fibonacci is a function that returns
// a function that returns an int.
func fibonacci() func() int {
    prev1, prev2 := 0, 1
    return func() int {
        val := prev1
        prev1, prev2 = prev2, prev1+prev2
        return val
    }
}

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