Store Utilities

createStore

Edit this page

Stores were intentionally designed to manage data structures like objects and arrays but are capable of handling other data types, such as strings and numbers.

Types Signature

import { createStore } from "solid-js/store";
import type { StoreNode, Store, SetStoreFunction } from "solid-js/store";


function createStore<T extends StoreNode>(
  state: T | Store<T>
): [get: Store<T>, set: SetStoreFunction<T>];


type Store<T> = T; // conceptually readonly, but not typed as such

Usage

import { createStore } from "solid-js/store";


// Initialize store
const [store, setStore] = createStore({
  userCount: 3,
  users: [
    {
      id: 0,
      username: "felix909",
      location: "England",
      loggedIn: false,
    },
    {
      id: 1,
      username: "tracy634",
      location: "Canada",
      loggedIn: true,
    },
    {
      id: 1,
      username: "johny123",
      location: "India",
      loggedIn: true,
    },
  ],
});

Getter

Store objects support the use of getters to store derived values.

const [state, setState] = createStore({
  user: {
    firstName: "John",
    lastName: "Smith",
    get fullName() {
      return `${this.firstName} ${this.lastName}`;
    },
  },
});

Setter

Changes can take the form of function that passes previous state and returns new state or a value. Objects are always shallowly merged. Set values to undefined to delete them from the Store. In TypeScript, you can delete a value by using a non-null assertion, like undefined!.

const [state, setState] = createStore({
  firstName: "John",
  lastName: "Miller",
});


setState({ firstName: "Johnny", middleName: "Lee" });
// ({ firstName: 'Johnny', middleName: 'Lee', lastName: 'Miller' })


setState((state) => ({ preferredName: state.firstName, lastName: "Milner" }));
// ({ firstName: 'Johnny', preferredName: 'Johnny', middleName: 'Lee', lastName: 'Milner' })

To learn more about using stores check the Stores Guide, and the Store utilities section for more advanced APIs.

Report an issue with this page