Benchmark: #each vs for

for.rb

require "benchmark"
require "benchmark/ips"

range = Array(1..100_000)

Benchmark.ips do |x|
  x.report("each") { range.each { |x| } }
  x.report("for")  { for x in range; end }
end

# $ ruby -v
# ruby 2.1.0p0 (2013-12-25 revision 44422) [x86_64-darwin13.0]
# $ ruby for.rb  
# Calculating -------------------------------------
#                 each        10 i/100ms
#                  for         9 i/100ms
# -------------------------------------------------
#                 each      107.3 (±2.8%) i/s -        540 in   5.034679s
#                  for       97.5 (±5.1%) i/s -        486 in   4.999733s