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Clojure in Action

Cover of Clojure in Action by Amit Rathore Published by Manning Publications
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Chapter 14. Protocols, records, and types


This chapter covers

  • An overview of the expression problem
  • A custom solution to the expression problem
  • Clojure’s solution to the expression problem
  • A look at deftype, defrecord, reify


Abstraction is an important tenet of software development because it allows code that’s maintainable and extensible. Clojure itself is built on abstractions. For instance, most things in Clojure are coded to interfaces rather than being direct concrete implementations. This allows for reuse of code that expects those interfaces and allows the addition of more implementations to the mix.

Sooner or later, during your time on most projects, you’ll run into an abstraction-oriented issue known as the expression problem ...

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