Functional Programming in JavaScript

  1. Functional Data Structures
    1. Functor Pattern
      1. Mathematical Definition
        1. Functor Laws
          1. Identity Law
            1. Composition Law
            2. Container Abstraction
            3. Array as Functor
              1. map Method as fmap
                1. Functor Law Verification
                  1. Transformation Chains
                  2. Maybe Functor
                    1. Null Safety Purpose
                      1. Some and None States
                        1. Implementation Structure
                          1. Functor Instance
                            1. Practical Applications
                            2. Either Functor
                              1. Error Handling Purpose
                                1. Left and Right Values
                                  1. Implementation Structure
                                    1. Functor Instance
                                      1. Error Propagation
                                      2. Monad Pattern
                                        1. Mathematical Definition
                                          1. Monad Laws
                                            1. Left Identity
                                              1. Right Identity
                                                1. Associativity
                                                2. Chaining Operations
                                                3. Maybe Monad
                                                  1. flatMap Implementation
                                                    1. Chaining Nullable Operations
                                                      1. Avoiding Nested Checks
                                                      2. Either Monad
                                                        1. flatMap Implementation
                                                          1. Error Handling Chains
                                                            1. Railway-Oriented Programming
                                                            2. Promise as Monad
                                                              1. then Method as flatMap
                                                                1. Asynchronous Chaining
                                                                  1. Error Propagation

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                                                                10. Error Handling in Functional Programming