How to set an object key inside a state object in React Hooks?
We can update a React hooks state object that has a nested object containing objects with index keys with the following approach, Before doing so, consider the following example:
Example: Following is the default state object:
const [data, setData] = useState({
name:'',
contact:'',
address:{
0:{},
1:{},
}
})
Following is the desired output after updating a nested object:
{
name:'',
contact:'',
address:{
0:{"city":'jaipur'},
1:{},
}
}
Solution: We can use the below syntax to set an object key inside a state object:
data.address[0].city = 'jaipur';
setData({...data});
Creating React Application:
Step 1: Create a React application using the following command:
npx create-react-app foldername
Step 2: After creating your project folder i.e. foldername, move to it using the following command:
cd foldername
Filename: App.js
Javascript
import React, { Component, useState } from "react" ;
const App = () => {
const [data, setData] = useState({
name: '' ,
contact: '' ,
address: {
0: {},
1: {},
}
})
const handleUpdate = () => {
data.address[0].city = 'jaipur' ;
setData({ ...data });
}
return (
<div >
<button
style={{ margin: 100 }}
onClick={() => { handleUpdate() }} >
change state
</button>
{ data.address[0].city + " " }
</div>
);
}
export default App;
|
Step to Run Application: Run the application using the following command from the root directory of the project:
npm start
Output:
Last Updated :
14 Jan, 2021
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