Go Patterns

generator.go

package main

import "fmt"

func fib(n int) chan int {
  out := make(chan int)

  go func () {
    defer close(out)
    for i, j := 0, 1; i < n; i, j = i + j, i {
      out <- i
    }
  }()

  return out
}

func main() {
  for x := range fib(1000000) {
    fmt.Println(x)
  }
}