When you need to take a variety of different actions based on the value of a single variable, multiple
if..elsif tests are verbose and repetitive.
A neater alternative is provided by a
case statement. This begins with the word
case followed by the variable name to test. Then comes a series of
when sections, each of which specifies a “trigger” value followed by some code.
This code executes only when the test variable equals the trigger value:
case( i ) when 1 then puts("It's Monday" ) when 2 then puts("It's Tuesday" ) when 3 then puts("It's Wednesday" ) when 4 then puts("It's Thursday" ) when 5 then puts("It's Friday" ) when (6..7) then puts( "Yippee! It's the weekend! " ) else puts( "That's not a real day!" ) end