benchmark_strings.rb

require 'benchmark'

a = "this"
b = "is"
c = "a" 
d = "benchmark"

n = 100000000

Benchmark.bmbm do |x| 
  x.report("plus:") { 
    1.upto(n) do |i| 
      string = a + "::" + b + "::" + c + "::" + d 
    end 
  }
  x.report("interpolate:") {
    1.upto(n) do |i| 
      string = "#{a}::#{b}::#{c}::#{d}"
    end 
  }
  x.report("array:") {
    1.upto(n) do |i| 
      string = [a,b,c,d].join("::")
    end 
  }
end