NetEase Cloud Music Tech Team

Nov 6, 2020 · Fundamentals

Pure Functions, Functors, and Applicative Functors with LazyBox in JavaScript

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.