Ruby string interpolation benchmark

gistfile1.rb

require 'benchmark'

first  = 'first'
second = 'second'
n = 1_000_000
Benchmark.bm do |x|
  x.report('string interpolation:    '){ n.times { "#{first}_#{second}" } }
  x.report('string interpolation #2: '){ n.times { first + '_' + second } }
  x.report('string interpolation #3: '){ n.times { "%s_%s" % [first, second] } }
  x.report('join array:              '){ n.times { [first, second].join('_') } }
end

# Result:
#
#        user                 system      total       real
# string interpolation:      0.260000   0.000000   0.260000 (  0.259696)
# string interpolation #2:   0.280000   0.000000   0.280000 (  0.282402)
# string interpolation #3:   0.960000   0.000000   0.960000 (  0.963318)
# join array:                0.680000   0.010000   0.690000 (  0.678449)