hash_selector_pattern.rb

type = :info

time = Time.now
2_000_000.times do
  msg = case type
        when :success then 'alert-success'
        when :error then 'alert-danger'
        when :warn then 'alert-warning'
        when :info then 'alert-info'
        end
end
puts "case: #{Time.now - time}"

time = Time.now
2_000_000.times do
  msg = if type == :success then 'alert-success'
        elsif type == :error then 'alert-danger'
        elsif type == :warn then 'alert-warning'
        elsif type == :info then 'alert-info'
        end
end
puts "if: #{Time.now - time}"

time = Time.now
msg = { 
   success: 'alert-success',
   error:   'alert-danger',
   notice:  'alert-info',
   warn:    'alert-warning'
}

2_000_000.times do
  msg[type]
end

puts "hash: #{Time.now - time}"