Go quiz

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What does the `:=` blank identifier `_` do?

1. What does the `:=` blank identifier `_` do?
2. What is a goroutine?
3. Which built-in adds an element to a slice?
4. What does `defer` do?
5. What does the `:=` operator do that `=` does not?
6. What does this compute: `len([]int{1, 2, 3, 4})`?
7. What is the right way to declare a struct?
8. How do you pause until a channel receives a value?
9. What does `go fmt` do?
10. Which idiomatic pattern returns errors from a function?
11. Which built-in returns the capacity (not length) of a slice?
12. What does `if err != nil { return err }` represent?

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