Compare '+' vs '\' for multiline string concatenation in Ruby

results.txt

Running with n of 1000000
                   user     system      total        real
slash:         0.170000   0.010000   0.180000 (  0.164066)
plus:          0.430000   0.000000   0.430000 (  0.439272)
interpolate:   0.170000   0.000000   0.170000 (  0.161643)

test.rb

require 'benchmark'

def multiline_with_slash
  'hello world'\
  '  how are you today?'
end

def multiline_with_plus
  'hello world' +
  '  how are you today?'
end

def multiline_with_interpolate
  "#{'hello world'}  how are you today?"
end

n = 1000000

puts "Running with n of #{n}"
Benchmark.bm(12) do |x|
  x.report("slash:") { n.times { multiline_with_slash } }
  x.report("plus:") { n.times { multiline_with_plus } }
  x.report("interpolate:") { n.times { multiline_with_interpolate } }
end