When I was first learning to program, a long time ago, it was in BASIC, and you had to annotate your variable names to indicate what type something is. foo would be a number, whereas foo$ would be a string. This meant that there could only be as many types of information as there were symbols to put after your variable, but that was okay for the sort of programming BASIC was used for.

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The post discusses the use of Hungarian notation in programming, including its origins in BASIC and its implementation in Perl and Haskell. It explores the benefits of annotating variable names with functors in Haskell and recommends this naming convention.

The Haskeller’s Hungarian Notation