Grokking Concurrency in Go
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Why Go Has a Context Package

The program below compiles, passes go vet, and never crashes, yet it wastes most of the work it does. Its search function calls the course's simulated fetch three times, one after another, so a full answer takes about 300 ms. The caller waits only 150 ms before it gives up.

Output:

fetched https://example.com/a at 100ms
caller gave up at 150ms
fetched https://example.com/b at 200ms
fetched https://example.com/c at 300ms
search finished at 300ms with nobody waiting

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