Concurrent Fibonacci sequence calculation w/ Golang

fibonacci.go

package main

import(
  "fmt"
  "time"
)

func main(){
  defer elapsed()()
  jobs := make(chan int, 100)
  results := make(chan int, 100)

  // concurrent workers
  // remove or add some to test different configs
  go worker(jobs, results)
  go worker(jobs, results)
  go worker(jobs, results)
  go worker(jobs, results)


  for i := 0; i < 100; i++ {
    jobs <- i
  }
  close(jobs)

  for j := 0; j < 50; j++ {
    fmt.Println(<-results)
  }
}

func worker(jobs <-chan int, results chan<- int){
  for n := range jobs {
    results <- fib(n)
  }
}

func fib(n int) int {
  if n <= 1 {
    return n
  }
  return fib(n-1) + fib(n-2)
}

// calculate time elapsed
func elapsed() func(){
  start := time.Now()
  return func(){
    fmt.Printf("Calculation took %v\n", time.Since(start))
  }
}
// Happy Fibonacci day :)