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@patio11
Created June 22, 2015 08:21
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An easy way to shoot yourself in the foot with 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
}
}
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