What is declarative-js

declarative-js is modern JavaScript library, that helps to:

• tackle array transformation with built in JavaScript array api (e.g. array.filter(toBe.unique())),
• provide a type-level solution for representing optional values instead of null references.

Why declarative-js?

• performance (link to benchmarks)
• ability to use with built in api (js array)
• it is written in typescript. All functions provides great type inference
• declarative code instead of imperative
• reduces boilerplate code providing performant and tested solutions
• comprehensive documentation (link)

Install

pnpm add declarative-js

Exports

All existing exports are still available from their current namespaces (Reducer, Sort, toBe, Filter, Mapper, optional, Optional, JMap, Map).

You can also import everything from the unified d namespace:

import { d } from 'declarative-js'

const grouped = [{ type: 'a', value: 1 }]
    .reduce(d.Reducer.groupBy('type'), d.Reducer.Map())

const mapped = [1, 2, 3].filter(d.toBe.present)

const map: d.MethodMap<number> = d.Map({ a: 1 })
const optional: d.OptionalInterface<number> = d.optional(42)

Documentation

All documentation can be found here: link

License

MIT