Functional Programming in JavaScript

  1. Pure Functions and Side Effects
    1. Pure Functions
      1. Definition and Requirements
        1. Deterministic Behavior
          1. No Side Effects Rule
            1. Referential Transparency
              1. Testing Pure Functions
              2. Side Effects
                1. Definition and Identification
                  1. Common Side Effect Sources
                    1. DOM Manipulation
                      1. Network Requests
                        1. Console Output
                          1. Global State Modification
                            1. File System Operations
                              1. Random Number Generation
                              2. Managing Side Effects
                                1. Isolation Strategies
                                  1. Functional Wrappers
                                    1. Effect Systems
                                  2. Function Purity Best Practices
                                    1. Input Validation
                                      1. Return Value Consistency
                                        1. Avoiding Hidden Dependencies
                                          1. Documentation and Naming

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                                        2. JavaScript Foundations for Functional Programming

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                                        4. Immutability in JavaScript