true-myth

A library for safe functional programming in JavaScript, with first-class support for TypeScript

option-t

A toolkit of Nullable/Option/Result type implementation in ECMAScript. Their APIs are inspired by Rust's `Option<T>` and `Result<T, E>`.

ts-opt

Typed Option/Optional/Maybe for TypeScript and JavaScript, created to simplify code involving optional values (null, undefined, NaN).

monads-io

🚀 Efficient Monads for JS: Maybe (Option) and Either (Result), Identity