Other OOP Patterns and Their Functional Counterparts

This section turns Other OOP Patterns and Their Functional Counterparts into concrete design checkpoints for Java engineers moving toward idiomatic Clojure. Treat the child pages as refactoring lenses: keep the useful design intent, then choose the smallest Clojure mechanism that makes the boundary explicit.

Work through these pages in order when refactoring an existing Java design. For new Clojure code, start with the simplest data flow that passes tests; add abstraction only when call sites repeat the same boundary.

In this section

• Strategy Pattern and Function Passing
  Use Strategy Pattern and Function Passing to compare familiar Java design-pattern habits with smaller Clojure shapes built from data, functions, namespaces, protocols, and explicit boundaries.
  • Defining Strategies as Functions in Clojure: A Functional Approach to Strategy Pattern
    Explore how to define strategies as functions in Clojure, offering a dynamic and flexible alternative to traditional Strategy Pattern implementations in Java.
  • Higher-Order Functions in Clojure: Mastering Functional Abstractions
    Explore the power of higher-order functions in Clojure, learn how they enable flexible and reusable code, and discover practical examples that demonstrate their application in real-world scenarios.
• Decorator Pattern and Function Composition
  Use Decorator Pattern and Function Composition to compare familiar Java design-pattern habits with smaller Clojure shapes built from data, functions, namespaces, protocols, and explicit boundaries.
  • Enhancing Behavior via Composition in Clojure: A Functional Approach
    Explore how function composition in Clojure enhances behavior without altering original functions, offering a powerful alternative to traditional object-oriented design patterns.
  • Mastering Function Composition and Partial Application in Clojure
    Explore the power of function composition with `comp` and partial application with `partial` in Clojure, enhancing code reusability and modularity.
• Command Pattern and First-Class Functions
  Use Command Pattern and First-Class Functions to compare familiar Java design-pattern habits with smaller Clojure shapes built from data, functions, namespaces, protocols, and explicit boundaries.
  • Representing Actions as Data: Simplifying Command Handling in Clojure
    Explore how Clojure leverages the concept of representing actions as data, simplifying command handling and enhancing flexibility in functional programming.
  • Queueing and Executing Commands in Clojure: Functional Patterns for Deferred Execution
    Explore how to implement queueing and executing commands in Clojure, enabling deferred execution and undo/redo functionality with functional programming principles.
• Iterator Pattern and Sequence Abstractions
  Use Iterator Pattern and Sequence Abstractions to compare familiar Java design-pattern habits with smaller Clojure shapes built from data, functions, namespaces, protocols, and explicit boundaries.
  • Understanding Lazy Sequences in Clojure for Efficient Data Processing
    Explore the power of lazy sequences in Clojure, enabling efficient handling of large or infinite data sets through deferred computation and memory optimization.
  • Functional Collection Traversal in Clojure: Mastering Map, Filter, and Reduce
    Explore the power of functional programming in Clojure by mastering collection traversal with map, filter, and reduce. Learn how to process collections efficiently without explicit iteration.
• Summary of Pattern Transformations: Reinterpreting OOP Patterns in Clojure
  Explore how common OOP design patterns are transformed and simplified using functional programming constructs in Clojure, offering a fresh perspective for Java professionals.