project_euler_2.go

package main
import (
  "fmt"
  "time"
)

func sum(nums chan int) {
  acc := 0
  for x := range nums {
    acc += x
    fmt.Println(acc)
  }
}

func main() {
  nums := make(chan int)
  go func(nums chan int) {
    for i, j := 0, 1; i < 4000000; i, j = j, j + i {
      if i % 2 == 0 {
        nums <- i
      }
    }
  }(nums)
  go sum(nums)

  // sleep so it doesn't return before any works done, don't know a way around this
  time.Sleep(0.001 * 1e9)
}