An easy way to shoot yourself in the foot with go

example.go

// The wrong way to do things:

for {
	switch {
	case <- channelA:
  		doSomething()
 	case <- channelB:
 		doSomethingElse()
 	default:
 	// Do nothing.
 	
 	// I tend to put empty default blocks in switch statements out of habit, and did this in a Go program. 
 	// Surprise!  If you have two non-blocking channel reads in a switch statement, the goroutine will only get executed
 	// when there is something to read from them.  But if you put in an empty default, ho ho ho, now you are spinning
 	// in a very tight loop.
	}
}

// the right way

for {
	switch {
	case <- channelA:
  		doSomething()
 	case <- channelB:
 		doSomethingElse()
 	// note absence of default statement
	}
}