[AYBABTME]

Something more useful I've found with DeMorgan is to flatten nested ifs:

   if (hasBread) {
      // do something
   }

Can be flattened to:

   if (!hasBread) {
      return
   }

As you start your function, flush out all the edge cases, invalid conditions and errors, then at every step forward in the function, you know you're always in a state were the odd balls have been taken care of and you deal with the general case.

This has two advantages:

   - it keeps the code tidy (the important parts are pretty 
     much never in a nested block).
   - it makes you handle the odd balls explicitely.

I really hate seeing functions such as :

   func cookBread() {
      if (hasBread) {
         do()
         a()
         bunch()
         of()
         stuff()
      }
   }