Challenge 2: case/when as an Expression — Solution

day_number = 3

day_name = case day_number
when 1 then "Monday"
when 2 then "Tuesday"
when 3 then "Wednesday"
when 4 then "Thursday"
when 5 then "Friday"
when 6, 7 then "Weekend"
else "Not a valid day"
end

puts day_name

=begin
Output:
Wednesday

Notes:
- The whole case/when block is assigned directly to day_name — there's no
  separate puts inside each when branch, and no temp variable declared
  before the case block and mutated inside it.
- when 6, 7 then "Weekend" shows a single branch matching two values at
  once, with no fall-through risk the way an unbroken PHP switch would have.
- Only after the case expression finishes evaluating does the single
  puts day_name line run, printing whichever branch's value was assigned.
=end