Challenge 1 — Solution

Task: Create a map stock := map[string]int{"apples": 10, "bananas":
5}. Add "oranges": 8 to it, update "apples" to 15, then print the
whole map.

package main

import "fmt"

func main() {
	stock := map[string]int{"apples": 10, "bananas": 5}

	stock["oranges"] = 8
	stock["apples"] = 15

	fmt.Println(stock)
}


Expected output:

map[apples:15 bananas:5 oranges:8]

Notes:
- Go's default Println formatting for a map always prints keys in
  alphabetical order, regardless of the order they were added or
  updated — this is a printing detail only, not the same as the
  randomised order seen when using for...range (Chapter 4).
- stock["oranges"] = 8 adds a brand-new key since "oranges" didn't
  exist yet; stock["apples"] = 15 updates the existing "apples" key
  instead — the exact same syntax does both jobs.
- No comma-ok form was needed here since the challenge isn't
  checking whether a key already exists, just assigning to it.