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This article traces the history of functional programming, explains why its pure‑function mindset is essential for modern front‑end development with React Hooks, and demonstrates practical patterns such as functors, monads, partial application, and memoization using concise JavaScript examples.
The article explains JavaScript’s Functor, Applicative, and Monad abstractions—showing how map, ap, and chain (flatMap) on Box types such as Either, LazyBox, and a lazy Task can replace nested try‑catch and null checks, enable composable synchronous and asynchronous code, and support parallel execution with Task.ap.
The article introduces pure functions and shows how JavaScript functors like Box can lazily transform values with map, uses LazyBox to defer side effects until fold, then extends the concept to applicative functors and Either for composable validation via ap and liftA2 helpers.