while(true) vs loop

_while_true_vs_loop.rb

require 'benchmark'

MAX = 10**8

puts Benchmark.measure{
  a = MAX

  while(true)
    a -= 1
    break if a == 0
  end
}

puts Benchmark.measure{
  a = MAX

  loop do
    a -= 1
    break if a == 0
  end
}

output.txt

  1.720000   0.000000   1.720000 (  1.722252)
  5.220000   0.000000   5.220000 (  5.219000)