Challenge 3 — Solution

Task: Write a function printAll(items []any) that takes a slice of
any and prints each item on its own line. Call it with a slice
containing a mix of an int, a string, and a Circle value.

package main

import "fmt"

type Circle struct {
	Radius float64
}

func printAll(items []any) {
	for _, item := range items {
		fmt.Println(item)
	}
}

func main() {
	items := []any{42, "hello", Circle{Radius: 5}}
	printAll(items)
}


Expected output:

42
hello
{5}

Notes:
- []any can hold completely unrelated types side by side — an int, a
  string, and a Circle struct — since any has zero required methods
  and is satisfied by literally everything.
- fmt.Println's default formatting for a struct like Circle{5} shows
  its field values inside curly braces ({5}), since Circle has no
  custom String() method to control how it prints.
- printAll itself has no idea what type each item really is — it
  only relies on fmt.Println accepting any value, which is itself
  built to handle any type generically.