The For Select Loop

Output:

tick 1
tick 2
tick 3
reporter stopped after 3 ticks

The reporter goroutine does a small piece of work every 100 ms. It stops at once when main closes done. Its body is a for loop with a select inside, and that combination is called a for-select loop. Most long-running goroutines in Go programs have this form: a worker that takes jobs, a cache that refreshes itself, a server loop that accepts events.

The program is short, but each line in the loop has a reason, and small changes to it cause real bugs

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