Golang Note Five

Select

• The select statement lets a goroutine wait on multiple communication operations.
• A select blocks until one of its cases can run, then it executes that case. It chooses one at random if multiple are ready.

Default Selection

• The default case in a select is run if no other case is ready.
• Use a default case to try a send or receive without blocking:

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select {
case i := <-c:
    // use i
default:
    // receiving from c would block
}