Benchmarks

array-random.rb

def a
  t = Time.now

  Array.new(10_000_000) { rand }

  puts Time.now - t
end

10.times { a }

string-upcase.rb

def a
  t = Time.now

  10_000_000.times { "abcdefg".upcase }

  puts Time.now - t
end

10.times { a }

while-bignum.rb

def a
  t = Time.now
  i = 1
  n = 1

  while i < 100_000
    n *= i
    n += 1

    i += 1
  end

  n

  puts Time.now - t
end

10.times { a }

while-integer.rb

def a
  t = Time.now
  i = 1
  n = 1

  while i < 10_000_000
    n *= i
    n %= 10000
    n += 1

    i += 1
  end

  n

  puts Time.now - t
end

10.times { a }

while-string.rb

def a
  t = Time.now
  i = 0
  str = ""

  while i < 10_000_000
    i += 1

    str << i.to_s
  end

  puts Time.now - t
end

10.times { a }

while.rb

def a
  t = Time.now
  i = 0

  while i < 10_000_000
    i += 1
  end

  puts Time.now - t
end

10.times { a }