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What is pure function?
- Functional programming is a paradigm where you build software by creating and combining functions that take an input, perform operations, and produce an output, ensuring predictability.
- Benefits include reusability, statelessness, ease of testing, and concurrency friendliness.
- Pure functions in functional programming strictly adhere to rules like always returning a single value, based only on inputs, and not mutating existing values.
- Impure functions may exist due to violating these rules, which could hinder the alignment with functional programming goals.
- Managing large data sets in functional programming may sometimes require compromises on immutability for performance optimization.
- In Java, manual copying is often necessary to maintain immutability in collections, unlike languages with built-in immutable collections.
- A sample function 'doubleAllValues' is illustrated to create a new collection to prevent mutation, showcasing the balance between immutability and performance.
- Understanding pure functions and following their rules is essential in functional programming, although there are additional concepts to delve into.
- For further exploration of functional programming, references like the book 'Grokking Functional Programming' are suggested.
- Functional programming emphasizes building software by combining predictable functions and adhering to principles like imperative style, statelessness, and immutability.
- The concepts of pure functions serve as a foundational element in understanding and applying functional programming principles.
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