Benchmark: String#+ vs String#<<

benchmark.rb

require 'benchmark'
 
s = ""
t = ""
 
n = 100_000
 
Benchmark.bm(10) do |bm|
  bm.report('String#+')   { n.times { s += "A" } }
  bm.report('String#<<')  { n.times { t << "A" } }
end

results.txt

                 user     system      total        real
String#+     1.450000   0.840000   2.290000 (  2.289673)
String#<<    0.010000   0.000000   0.010000 (  0.016658)