This is React code... This code includes the React components - BankAccount and Balance. To use the components, create an index.js file in React as follows -

the BankAccount component has a text box and shows the TotalBalance state. you can change the TotalBalance state by putting a +ve or -ve number value in the text box and c lick on submit. the totalbalance state will change. we have overriddent (extended) a button and a div components here. the Balance component is just a formatted div that shows the amount property... import BankAccount from './Components/BankAccountUsingState/BankAccount'; ReactDOM.render ( , document.getElementById('root') );