Question

the basic syntax of switch statement in ruby is

case expression
  when condition1
    statements1
  when condition2
    statements2
  else
    statements
end

Is there a way to get control expression value in statements?

Means, is there some variable which stores expression value which can be used directly – and expression need not be called again in statements body?

Answer 1

There is no magic variable. It’s no trouble to use an ordinary variable:

case a = expensive_method
  when condition1
    puts "#{a} meets condition 1"
  when condition2
    puts "#{a} meets condition 2"
end