var prng = function()

in tool/seedrandom.js [66:83]

• 16 lines of code
• 3 McCabe index (conditional complexity)

    var prng = function () {
      var n = arc4.g(chunks), // Start with a numerator n < 2 ^ 48
        d = startdenom, //   and denominator d = 2 ^ 48.
        x = 0; //   and no 'extra last byte'.
      while (n < significance) {
        // Fill up all significant digits by
        n = (n + x) * width; //   shifting numerator and
        d *= width; //   denominator and generating a
        x = arc4.g(1); //   new least-significant-byte.
      }
      while (n >= overflow) {
        // To avoid rounding up, before adding
        n /= 2; //   last byte, shift everything
        d /= 2; //   right using integer math until
        x >>>= 1; //   we have exactly the desired bits.
      }
      return (n + x) / d; // Form the number within [0, 1).
    };