# Elf > A Reactive Store with Magical Powers Elf is a reactive immutable state management solution built on top of RxJS. It uses custom RxJS operators to query the state and pure functions to update it. Elf encourages simplicity. It saves you the hassle of creating boilerplate code and offers powerful tools with a moderate learning curve, suitable for experienced and inexperienced developers alike. ✅ Modular by design ✅ Tree Shakeable & Fully Typed ✅ CLI ✅ First Class Entities Support ✅ Requests Status & Cache ✅ Persist State ✅ State History ✅ Pagination ✅ Devtools

[![@ngneat/elf](https://github.com/ngneat/elf/actions/workflows/ci.yml/badge.svg)](https://github.com/ngneat/elf/actions/workflows/ci.yml) [![commitizen](https://img.shields.io/badge/commitizen-friendly-brightgreen.svg?style=flat-square)]() [![PRs](https://img.shields.io/badge/PRs-welcome-brightgreen.svg?style=flat-square)]() [![coc-badge](https://img.shields.io/badge/codeof-conduct-ff69b4.svg?style=flat-square)]() [![semantic-release](https://img.shields.io/badge/%20%20%F0%9F%93%A6%F0%9F%9A%80-semantic--release-e5079.svg?style=flat-square)](https://github.com/semantic-release/semantic-release) [![styled with prettier](https://img.shields.io/badge/styled_with-prettier-ff69b4.svg?style=flat-square)](https://github.com/prettier/prettier)

## 🤓 Learn about it on the [docs site](https://ngneat.github.io/elf/) ## 👩‍🎓 Check out the React Todos [example](https://stackblitz.com/edit/react-ts-jidhej?file=todos/todos.tsx) ## 😋 Check out the Angular Todos [example](https://stackblitz.com/edit/angular-ivy-sky1gb?file=src/app/todos/state/todos.repository.ts) or Books [example](https://stackblitz.com/edit/angular-ivy-j9azue?file=src/app/state/books.repository.ts)
```ts import { createStore, withProps, select, setProp } from '@ngneat/elf'; import { withEntities, selectAllEntities, setEntities } from '@ngneat/elf-entities'; interface TodosProps { filter: 'ALL' | 'ACTIVE' | 'COMPLETED'; } interface Todo { id: string; title: string; status: string; } const store = createStore( { name: 'todos' }, withProps({ filter: 'ALL' }), withEntities() ); export const filter$ = store.pipe(select(({ filter }) => filter)); export const todos$ = store.pipe(selectAllEntities()); export function setTodos(todos: Todo[]) { store.update(setEntities(todos)); } export function updateFilter(filter: TodosProps['filter']) { store.update(setProp('filter', filter)); } ``` ## 🗒️ Review the Change Logs - [`@ngneat/elf`](https://github.com/ngneat/elf/blob/master/packages/store/CHANGELOG.md) - [`@ngneat/elf-cli`](https://github.com/ngneat/elf/blob/master/packages/cli/CHANGELOG.md) - [`@ngneat/elf-devtools`](https://github.com/ngneat/elf/blob/master/packages/devtools/CHANGELOG.md) - [`@ngneat/elf-entities`](https://github.com/ngneat/elf/blob/master/packages/entities/CHANGELOG.md) - [`@ngneat/pagination`](https://github.com/ngneat/elf/blob/master/packages/pagination/CHANGELOG.md) - [`@ngneat/persist-state`](https://github.com/ngneat/elf/blob/master/packages/persist-state/CHANGELOG.md) - [`@ngneat/requests`](https://github.com/ngneat/elf/blob/master/packages/requests/CHANGELOG.md) - [`@ngneat/state-history`](https://github.com/ngneat/elf/blob/master/packages/state-history/CHANGELOG.md) ## ⭐ Usage Trend of Elf Packages [Usage Trend of Elf Packages](https://npm-compare.com/@ngneat/elf,@ngneat/elf-entities,@ngneat/elf-devtools,@ngneat/elf-persist-state,@ngneat/elf-requests,@ngneat/elf-pagination,@ngneat/elf-cli-ng,@ngneat/elf-state-history,@ngneat/elf-cli)

	Stars	Issues	Version	Updated	Created
@ngneat/elf	1,555	4	2.5.1	3 months ago	3 years ago
jotai	17,446	9	2.8.0	a month ago	4 years ago
mobx	27,262	61	6.12.3	2 months ago	8 years ago
recoil			0.7.7	a year ago	4 years ago
redux	60,508	41	5.0.1	5 months ago	13 years ago
valtio	8,512	5	1.13.2	3 months ago	4 years ago
zustand	43,171	7	4.5.2	3 months ago	5 years ago

@ngneat/elf vs jotai vs mobx vs recoil vs redux vs valtio vs zustand

Downloads in past1 Month3 Months6 Months1 Year2 Years5 YearsAll time

Stats

Popular Searches

Sick of boring JavaScript newsletters?

Downloads in past