Editing WoW:UI best practices (section)

==== Lazy Coding ====

You can utilize the Short-Circuiting functionality to make sure a variable has a value before comparing it to a literal:

 if foo[bar] == 5 then -- might throw "attempting to index field ? a nil value"
     DoStuff()
 end
 if foo and foo[bar] == 5 then -- will not throw an error
     DoStuff()
 end

You can also "cheat" if all you want to do is make sure a variable has a value other than nil or false:
 -- This:
 if foo then
     print(foo)
 elseif bar then
     print(bar)
 else
     print("nothing to print")
 end
 -- Can be written as:
 print(foo or bar or "nothing to print")