# 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

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## 🤓 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
mobx	27,262	61	6.12.3	2 months ago	8 years ago
nanostores	4,800	22	0.10.3	a month ago	3 years ago
recoil			0.7.7	a year ago	4 years ago
redux	60,505	41	5.0.1	5 months ago	13 years ago
valtio	8,508	5	1.13.2	3 months ago	4 years ago
zustand	43,143	7	4.5.2	3 months ago	5 years ago

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