Fibonacci in Go

fib.go

package main

import "fmt"

// fibonacci is a function that returns
// a function that returns an int.
// this is my solve to https://tour.golang.org/moretypes/26
func fibonacci() func() int {

	next := -1
	sum := 0
	current := 0
	return func() int {
		if (next < 1 ) {
			next = next + 1
			return next
		}
		
		sum = current + next
		current = next
		next = sum
		return sum
		
	}
}

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

better implementation here: https://hackernoon.com/aws-lambda-go-vs-node-js-performance-benchmark-1c8898341982
(JavaScript version)