String Concatenation Benchmarks

string_test.rb

require 'benchmark'

first_name = "first"
last_name = "last"

Benchmark.bm do |x|
  x.report { 100000.times do; "#{first_name} #{last_name}" ; end; }
  x.report { 100000.times do; [first_name, last_name].join(' ') ; end; }
  x.report { 100000.times do; '%s %s' % [first_name, last_name] ; end; }
  x.report { 100000.times do; first_name + ' ' + last_name ; end; }
end

#       user     system      total        real
#   0.040000   0.000000   0.040000 (  0.042028)
#   0.090000   0.000000   0.090000 (  0.087404)
#   0.120000   0.000000   0.120000 (  0.126011)
#   0.040000   0.000000   0.040000 (  0.040019)