Software Design for Flexibility: How to Avoid Programming Yourself into a Corner

by Chris Hanson and Gerald Jay Sussman

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Strategies for building large systems that can be easily adapted for new situations with only minor programming modifications.

Time pressures encourage programmers to write code that works well for a narrow purpose, with no room to grow. But the best systems are evolvable; they can be adapted for new situations by adding code, rather than changing the existing code. The authors describe techniques they have found effective--over their combined 100-plus years of programming experience--that will help programmers avoid programming themselves into corners.

The authors explore ways to enhance flexibility by:
  • Organizing systems using combinators to compose mix-and-match parts, ranging from small functions to whole arithmetics, with standardized interfaces
  • Augmenting data with independent annotation layers, such as units of measurement or provenance
  • Combining independent pieces of partial information using unification or propagation
  • Separating control structure from problem domain with domain models, rule systems and pattern matching, propagation, and dependency-directed backtracking
  • Extending the programming language, using dynamically extensible evaluators
    • ISBN10 0262045494
    • ISBN13 9780262045490
    • Publish Date 9 March 2021
    • Publish Status Active
    • Publish Country US
    • Publisher MIT Press Ltd
    • Imprint MIT Press