From: Colin Bartlett <colinb2r@...>
Date: 2009-12-24T06:42:46+09:00
Subject: Date.gregorian_leap? code

from date.rb
  # Is a year a leap year in the Gregorian calendar?
  # All years divisible by 4 are leap years in the Gregorian calendar,
  # except for years divisible by 100 and not by 400.
  def self.gregorian_leap? (y) y % 4 == 0 && y % 100 != 0 || y % 400 == 0 end

Because of the precedence of && and || this is presumably parsed as
     ( y % 4 == 0 && y % 100 != 0 ) || y % 400 == 0
and I'm trying to think of reasons why it is coded as it is instead of, say:
     y % 4 == 0 && ( y % 100 != 0 || y % 400 == 0 )

Any suggestions?