case matches using ===

output

unknown, String, foo
unknown, Fixnum, 42
unknown, Array,

sscce.rb

def exec_update(*params)
  if params.empty?
    puts 'empty'
  else
    params.each_with_index do |p, i|
      case p
      when String
        puts 'string'
      when Fixnum
        puts 'int'
      else
        puts "unknown, #{p.class.to_s}, #{p.to_s}"
      end
    end
  end
end


exec_update('foo', 42, [])