Make Meaningful Distinctions

Programmers create problems for themselves when they write code solely to satisfy a compiler or interpreter. For example, because you can’t use the same name to refer to two different things in the same scope, you might be tempted to change one name in an arbitrary way. Sometimes this is done by misspelling one, leading to the surprising situation where correcting spelling errors leads to an inability to compile.^[2]

^[2] Consider, for example, the truly hideous practice of creating a variable named klass just because the name class was used for something else.