Well, for such things as difficulty, there's not a lot of difference in how the code reads and just a verbal explanation. It's kind of just busy work to write it out. But if you have questions, go ahead and ask them.

Every 2016 blocks, look at the last 2016 blocks. IntervalLength=Last blocktime - first blocktime. Adjust the difficulty according to NewDifficulty=OldDifficulty*(2 weeks)/(IntervalLength). If the NewDifficulty is more than 4x or less than .25x, limit it.

There you go.