code: public static double length(int x, int y, int z, int w) {
          return Math.sqrt(lengthSquared(x, y, z, w));
      }
docs: Get the length of a 4-dimensional single-precision vector.
  
  @param x The vector's x component
  @param y The vector's y component
  @param z The vector's z component
  @param w The vector's w component
  
  @return the length squared of the given vector