case

# `case`: one value, many branches.

def day_kind(day : String) : String
  case day
  when "Saturday", "Sunday" then "weekend"
  when "Friday"             then "almost"
  else                           "weekday"
  end
end

puts day_kind("Sunday")
puts day_kind("Friday")
puts day_kind("Tuesday")

# A `case` with no value tests each condition in turn.
score = 87
case
when score >= 90 then puts "A"
when score >= 80 then puts "B"
else                  puts "C"
end

# `case ... in` matches on type, and it must cover every possibility.
# `it` is the value, already narrowed to the branch's type.
value = score > 50 ? 1 : "one"
case value
in Int32  then puts "a number: #{it + 1}"
in String then puts "a word: #{it.upcase}"
end