Functional programming primitives in Javascript

Short summary

The article explains core functional programming primitives—Functors, Monoids, Monads, and Applicatives—through JavaScript code examples, mapping category theory concepts to practical implementations. It shows how native JS constructs like Array.map, Array.prototype.flatMap, and Promise already embody these patterns, and builds custom containers (Box) to demonstrate each primitive from scratch. A summary table ties the primitives together by their core interfaces and purposes.

• •Defines Functors, Monoids, Monads, and Applicatives with custom JS Box container implementations
• •Maps each concept to native JS equivalents like Array.map, reduce, flatMap, and Promise.then
• •Includes a reference table summarizing core interfaces and purposes of each primitive

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