case-switch-bm.rb

case-switch-bm.rb

require 'benchmark'

def with_if_else(symbol)
  if symbol == :success
    'alert-success'
  elsif symbol == :error
    'alert-danger'
  elsif symbol == :warn
    'alert-warning'
  elsif symbol == :info
    'alert-info'
  end
end

def with_case(symbol)
  case symbol
    when :success   then 'alert-success'
    when :error     then 'alert-danger'
    when :warn      then 'alert-warning'
    when :info      then 'alert-info'
  end
end

def with_hash(symbol)
  {
    success:  'alert-success',
    error:    'alert-danger',
    warn:     'alert-warning',
    info:     'alert-info'
  }[symbol]
end

puts "If/Else"
b = Benchmark.measure do
  10_000.times do
    with_if_else :success
    with_if_else :error
    with_if_else :warn
    with_if_else :info
  end
end
puts b

puts "Case"
b = Benchmark.measure do
  10_000.times do
    with_case :success
    with_case :error
    with_case :warn
    with_case :info
  end
end
puts b

puts "Hash lookup"
b = Benchmark.measure do
  10_000.times do
    with_hash :success
    with_hash :error
    with_hash :warn
    with_hash :info
  end
end
puts b

results.txt

ruby case-switch.rb
If/Else
  0.010000   0.000000   0.010000 (  0.011829)
Case
  0.010000   0.000000   0.010000 (  0.006596)
Hash lookup
  0.040000   0.000000   0.040000 (  0.047209)

This is using Ruby 2.1.1p76 on OS X.