Practice: Strings and Maps

The following exercises cover strings and maps.

1. For s:= "café", print len(s) and len([]rune(s)). Explain the difference using what you know about UTF-8.

2. Convert the string "Go ߦ顢 to []byte and []rune. Print both representations, then convert each back to a string and confirm the round-trip matches the original.

3. Use a map as a set to compute the union of []int{1, 2, 3, 4} and []int{3, 4, 5, 6} as a deduplicated []int. Order doesn’t matter.