String Concatenation

gistfile1.rb

# Ruby String Concatenation Benchmarks

require 'benchmark'

n = 100000

a = "a"
b = "b"
c = "c"

Benchmark.bm do |x|
  x.report { for i in 1..n ; str = ""; str << a << b << c   ; end }
  x.report { for i in 1..n ; str = ""; str = a + b + c      ; end }
  x.report { for i in 1..n ; str = ""; str = "#{a}#{b}#{c}" ; end }
  x.report { for i in 1..n ; str = ""; str = [a,b,c].join   ; end }
end

# Ruby 1.9.2
#     user     system      total        real
# 0.050000   0.000000   0.050000 (  0.057254)
# 0.060000   0.000000   0.060000 (  0.061110)
# 0.060000   0.000000   0.060000 (  0.066547)
# 0.120000   0.000000   0.120000 (  0.123455)