Challenge 1 — Solution

Task: Write a classic counting for loop that prints every even
number from 0 to 10 (inclusive), using i += 2 in the post clause
instead of i++.

package main

import "fmt"

func main() {
	for i := 0; i <= 10; i += 2 {
		fmt.Println(i)
	}
}


Expected output:

0
2
4
6
8
10

Notes:
- The condition is i <= 10, not i < 10, since 10 itself needs to be
  included in the output.
- i += 2 in the post clause replaces the usual i++, stepping by 2
  each time instead of 1 — the loop's three clauses (init; condition;
  post) work exactly like JavaScript's for loop, just without the
  surrounding parentheses.
- This same combination (<=, += 2) would not loop at all if i started
  above 10, since the condition would be false immediately.