Interpolate.rb

require 'benchmark/ips'
require 'benchmark'

Benchmark.ips do |r|
  r.report("one") do
    'string' + 'string'
  end

  r.report("two") do
    "string" + "string"
  end

  r.report("interpolate") do
    string = "string"
    "#{string}" + "#{string}"
  end
end

# Calculating -------------------------------------
#                  one     58967 i/100ms
#                  two     60432 i/100ms
#          interpolate     53134 i/100ms
# -------------------------------------------------
#                  one  1738566.2 (±5.9%) i/s -    8668149 in   5.004113s
#                  two  1727485.3 (±5.4%) i/s -    8641776 in   5.017653s
#          interpolate  1328588.0 (±5.8%) i/s -    6641750 in   5.018399s