module Polyfill::V2_5::Integer::ClassMethods

Public Instance Methods

sqrt(n) click to toggle source
# File lib/polyfill/v2_5/integer.rb, line 9
def sqrt(n)
  n = InternalUtils.to_int(n)
  if n < 0
    raise Math::DomainError, 'Numerical argument is out of domain - "isqrt"'
  end

  res = 0
  bit = 1 << ((n.size * 8) - 2)

  bit >>= 2 while bit > n

  while bit != 0
    res_bit = res + bit
    if n >= res_bit
      n -= res_bit
      res = (res >> 1) + bit
    else
      res >>= 1
    end

    bit >>= 2
  end

  res
end