This article offers a concise introduction to functional programming’s history, core concepts such as currying, composition, and immutability, and demonstrates their implementation in JavaScript using arrow functions and utilities like curry, compose, pipe, and map, while comparing functional and object‑oriented approaches.
This article introduces lambda calculus, explains its syntax and variable binding, details α, β, and η transformations, shows how to represent numbers and arithmetic with Church encoding, and walks through the Y combinator and its role in enabling recursion in pure functional expressions.
The article surveys functional programming’s origins, from Hilbert and Church to lambda calculus, explains its pure‑computation model versus imperative state mutation, outlines essential concepts such as currying, higher‑order functions, and immutability, discusses JavaScript‑specific practices and limitations, and notes the growing impact of functional ideas in modern front‑end frameworks.
