Benchmark of String concatenation

gistfile1.rb

require 'benchmark'

N = 70000

Benchmark.bmbm do |x|
  x.report('foo + bar') { N.times {
    'foo' + 'bar'
  } }
  x.report('#{foo}#{bar})') { N.times {
    "#{'foo'}#{'bar'}"
  } }
  x.report('foo << bar') { N.times {
    'foo' << 'bar'
  } }
  x.report('foo.concat(bar)') { N.times {
    'foo'.concat('bar')
  } }
end


# Rehearsal ---------------------------------------------------
# foo + bar         0.030000   0.000000   0.030000 (  0.027416)
# #{foo}#{bar})     0.010000   0.000000   0.010000 (  0.013595)
# foo << bar        0.020000   0.000000   0.020000 (  0.025066)
# foo.concat(bar)   0.030000   0.000000   0.030000 (  0.031215)
# ------------------------------------------ total: 0.090000sec
# 
#                       user     system      total        real
# foo + bar         0.030000   0.000000   0.030000 (  0.026326)
# #{foo}#{bar})     0.010000   0.000000   0.010000 (  0.012222)
# foo << bar        0.020000   0.000000   0.020000 (  0.025858)
# foo.concat(bar)   0.020000   0.000000   0.020000 (  0.033805)