Answer: All APIs of Node.js library are aynchronous that is non-blocking. It essentially means a Node.js based server never waits for a API to return data. Server moves to next API after calling it and a notification mechanism of Events of Node.js helps server to get response from the previous API call.
Source: tutorialspoint.com
| class Node { | |
| public int value; | |
| public Node left, right; | |
| public Node(int value, Node left, Node right) { | |
| this.value = value; | |
| this.left = left; | |
| this.right = right; | |
| } | |
| } |
This application should allow the user to update their username by inputting a custom value and clicking the button.
The Username component is finished and should not be changed, but the App component is missing parts. Finish the App component so that the Username component displays the inputted text when the button is clicked.
The App component should use the React.useRef Hook to pass the input to the Username component for the input element and for the Username component.
For example, if the user inputs a new username of "John Doe" and clicks the button, the div element with id root should look like this:
<div><button>Change Username</button><input type="text"><h1>John Doe</h1></div>