Case statement

General

Method 1
The case statement is used as follows:

operation = 1

case operation
when 1
   puts 'operation is successful'
when 0
   puts 'operation is a failure'
end

The compiler will compare the value after 'when' , which is 1 with operation. If it evaluates to true, then the code after "when 1" is executed.

Results : "operation is successful"

Method 2
Another method of use is :

operation = 1

result = case operation
             when 1
              1 + 1
             when 2
              1 - 1
             end

puts result

Here , result will print 2 because "1+1" is executed. This returns 2 and passed into "result" variable.