A practical guide to functional programming concepts using JavaScript as the learning language.
Mostly Adequate Guide is a book that teaches functional programming concepts using JavaScript as the primary learning language. It provides a practical approach to FP by leveraging a familiar language, making advanced concepts like monads and functors accessible through real-world examples and exercises. The guide bridges the gap between imperative programming habits and functional paradigms.
JavaScript developers looking to learn functional programming without switching languages, and programmers interested in FP concepts who prefer a practical, incremental learning approach.
It offers a unique blend of theoretical depth and practical applicability by using JavaScript, allowing developers to immediately apply FP principles to their daily work while preparing them for pure functional languages.
Mostly adequate guide to FP (in javascript)
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Uses JavaScript to teach FP, enabling immediate application in daily work without switching languages, as emphasized in the README's rationale for leveraging a familiar ecosystem.
Allows incremental learning without requiring full purity upfront, with runnable exercises and npm support (@mostly-adequate/support) for hands-on practice, accommodating mixed-paradigm codebases.
Covers algebraic data structures and interfaces that translate to other FP languages like Haskell and Scala, providing a solid theoretical base for broader FP adoption.
Available online via Gitbook with interactive features, plus downloadable PDF and EPUB versions, offering flexibility for different learning preferences and offline use.
The README warns that the project setup is old, requiring specific Node versions like v10.22.1 and tools like Calibre, which can lead to compatibility issues and complex local builds.
Future plans indicate parts 2 and 3 are not fully written, leaving advanced topics like monad transformers and categorical constructs unavailable or in draft form.
While it bridges to pure FP languages, JavaScript's dynamic typing and impure features mean learners must adapt concepts to a less rigorous environment, potentially masking some FP benefits.