Goroutines

A goroutine is a lightweight thread managed by the Go runtime. You start one with the go keyword before a function call. Goroutines run concurrently with the rest of the program.

package mainimport (    "fmt"    "time")func say(s string) {    for i := 0; i < 3; i++ {        fmt.Println(s)        time.Sleep(100 * time.Millisecond)    }}func main() {    go say("goroutine")    say("main")}

Terminal

Channels

Goroutines communicate via channels. A channel is a typed pipe — you send values into it with <- and receive values from it the same way.

package mainimport "fmt"func sum(s []int, ch chan int) {    total := 0    for _, v := range s {        total += v    }    ch <- total}func main() {    nums := []int{1, 2, 3, 4, 5, 6}    ch   := make(chan int)    go sum(nums[:3], ch)    go sum(nums[3:], ch)    a, b := <-ch, <-ch    fmt.Println("Sum:", a+b)}

Terminal

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