Mastering Concurrency in Go/

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The For-Select Loop

The For-Select Loop

Let's see how we can combine the `for` and `select` statements in order to communicate over channels in Go.

We'll cover the following...

The for-select loop can be structured as follows:

Go (1.6.2)
for { //either range over a channel or loop infinitely
  select {
    //handle channel operations
  }
}

First, let’s try to loop over something that goes on infinitely.

Go (1.6.2)
package main
import "fmt"
func getNews(newsChannel chan string){
  NewsArray := [] string {"Roger Federer wins the Wimbledon","Space Exploration has reached new heights","Wandering cat prevents playground accident"}
  for _, news := range NewsArray{
    newsChannel <- news 
  }
  newsChannel <- "Done"
  close(newsChannel)
}
func main() {
  myNewsChannel := make(chan string)
  go getNews(myNewsChannel)
  
  for {
    select{
      case news := <-myNewsChannel:
        fmt.Println(news)
        if news == "Done"{
          return
        }
      default:
    }
    
  }
}

You might have wondered why the loop did not run infinitely. Well, that’s because I checked for my "Done" signal and returned from the ...