# React state

When a query returns an object and you want to store it in React State, you can use GraphQL Zeus to have 100% type-safe objects in your state.

Here's an example schema:

```graphql
type Query {
  listUsers: [User!]
}

type User {
  createdAt: String!
  firstName: String!
  lastName: String!
  age: Int
  username: String!
  id: String!
}
```

You can use Zeus types to get the type of the objects received from a GraphQL Backend

```tsx
import React, { useState } from 'react';
import { GraphQLTypes, InputType, Selector, Chain } from './zeus';

const userSelector = Selector('User')({
  createdAt: true,
  firstName: true,
  lastName: true,
  id: true,
});

type StoredUser = InputType<GraphQLTypes['User'], typeof userSelector>

const getFullName = (u:StoredUser) => u.firstName + ' ' + u.lastName

export const UsersList: React.FC = () => {
  const [users, setUsers] = useState<Array<StoredUser>>([]);

  useEffect(()=>{
      Chain('https://yourschemaurl.com/graphql', {})('query')({
        listUsers: userSelector
      }).then( response => {
        // 100% type-safe
        setUsers(response.data)
      })
    };
  },[])

  return (
    <div>
      {users.map((u) => (
        <div key={u.id} className="flex items-center">
          <div className="font-bold p-4 flex-1">{getFullName(u)}</div>
          <div className="p-4">{u.createdAt}</div>
        </div>
      ))}
    </div>
  );
};
```


---

# Agent Instructions: Querying This Documentation

If you need additional information that is not directly available in this page, you can query the documentation dynamically by asking a question.

Perform an HTTP GET request on the current page URL with the `ask` query parameter:

```
GET https://guide.graphqleditor.com/tools/index/index-2/state.md?ask=<question>
```

The question should be specific, self-contained, and written in natural language.
The response will contain a direct answer to the question and relevant excerpts and sources from the documentation.

Use this mechanism when the answer is not explicitly present in the current page, you need clarification or additional context, or you want to retrieve related documentation sections.