github.com/graybobo/golang.org-package-offline-cache@v0.0.0-20200626051047-6608995c132f/x/talks/2013/advconc/nilselect/nilselect.go (about)

     1  // +build OMIT
     2  
     3  package main
     4  
     5  import (
     6  	"fmt"
     7  	"math/rand"
     8  	"time"
     9  )
    10  
    11  func init() {
    12  	rand.Seed(time.Now().UnixNano())
    13  }
    14  
    15  func main() {
    16  	a, b := make(chan string), make(chan string)
    17  	go func() { a <- "a" }()
    18  	go func() { b <- "b" }()
    19  	if rand.Intn(2) == 0 {
    20  		a = nil // HL
    21  		fmt.Println("nil a")
    22  	} else {
    23  		b = nil // HL
    24  		fmt.Println("nil b")
    25  	}
    26  	select {
    27  	case s := <-a:
    28  		fmt.Println("got", s)
    29  	case s := <-b:
    30  		fmt.Println("got", s)
    31  	}
    32  }