An early try at programming-with-cartoons, in the spirit of _why’s Poignant Guide. Current work is at home.
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bubble 1: guy asks bird
What is select?bubble 2: bird explains
It's a control structure for concurrency. And Rob Pike, one of Golang's developers, says it's the reason channels and goroutines are built-in to the language.bubble 3: guy asks "how does it work?"
Bird answers "It waits until 1 channel is ready. Kind of like case, and then runs the code in the corresponding branch."bubble 4: bird explains lines in Rob Pike's example
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select {
case v1 := <-c1:
fmt.Printf("received %v from c1\n", v1)
case v2 := <-c2: // bird says here it is fanning in from c1 and c2 to stdout
fmt.Printf("received %v from c2\n", v1)
case c3 <- 23:
fmt.Printf("sent %v to c3\n", 23)
default: // giraffe says you can give a default if no channel is ready
fmt.Printf("no one was ready to communicate\n")
}