Prefix Notation

Prefix notation, also known as Polish notation, is a mathematical and programming notation where operators precede their operands. It eliminates the need for parentheses by defining a clear order of evaluation based on operator precedence and operand count. This notation is commonly used in Lisp-family programming languages and in compilers for expression parsing.

Also known as: Polish Notation, PN, Lisp Notation, Operator-First Notation, Pre-order Notation

Why learn Prefix Notation?

Developers should learn prefix notation when working with functional programming languages like Lisp, Scheme, or Clojure, as it is their default syntax for expressions. It is also useful for understanding compiler design, expression parsing algorithms, and implementing calculators or interpreters that handle mathematical expressions without ambiguity.

Learning Resources

• docs: Wikipedia: Polish Notation
• tutorial: GeeksforGeeks: Prefix Notation Tutorial
• course: MIT OpenCourseWare: Structure and Interpretation of Computer Programs (Lisp)
• video: YouTube: Prefix Notation Explained
• book: Book: 'The Little Schemer' by Daniel P. Friedman