Functional Tools

This is a repository of all my personal tools for functional programming in TypeScript. Since this library relies heavily on TypeScript's type system, it won't be useful for applications in Vanilla JavaScript or using typecheckers like Flow.

Modules

composition

The composition module provides two versions of functional composition: compose and composeRight. compose performs function composition in the listed order, so the function passed as the first parameter is applied first. While this is not traditionally how function composition works, it's much easier to reason about. Those looking for a more traditional compose function, there's composeRight, which applies functions in the reverse of listed order.

maybe

The maybe module is the smallest module in the lot and quite possibly pointless. This module provides a generic "option" type whose value is either that of the type parameter, or null.

optics

The optics module is the module I am so far most proud of. This provides types for lenses and prisms, as well as a function for composing optics together. For now, optic composition is in listed order.