Fibonacci in Go

fibonacci.go

package main

import "fmt"

// fibonacci is a function that returns
// a function that returns an int.
func fibonacci() func() int {
    current_fib_number := 0
    prev_fib_number := 0
    
    f := func() int {
        result := prev_fib_number + current_fib_number
        prev_fib_number = current_fib_number
        
        if result == 0 {
            current_fib_number += 1
        } else {
            current_fib_number = result
        }
        return result
    }
    
    return f
}

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