A callback function in JavaScript is a function that is passed as an argument to another function and is invoked after some kind of event.
it continues with the execution of the next statement (console.log("End")). After the timeout, the asynchronous function is invoked, andAsync operation completedis logged
Node.js: It is used to handle the server-side. Now that we know about MEAN stack, let’s further see each of its components in detail. We will start with MongoDB, and then we will learn the different versions of it, why it is used in MEAN, and much more. What is MongoDB? Mong...
Let’s start by creating a fetcher.js in the src folder of our application. We have abstracted out the logic of the application to make the fetchPerson function take an argument of the id of the person that we are interested in. In the context of SWAPI, those are integer values startin...
Is React frontend or backend? React is considered frontend. It’s commonly used to create interactive and dynamic UI components for web applications. However, React can also be used on the backend with technologies like Next.js, which allows for server-side rendering of React applications, blurri...
Creating a React component is the easiest way to create a JavaScript function. function Welcome(props) { return Hello World ; } To render the above component or simply function, follow the below script in your main app.js file. const root = ReactDOM.createRoot(document.getElementById('r...
The Version 16.8 of Facebook’s React JavaScript UI library add the hooks capability, for using state and other React features without having to write a class
In the other cases, we’ll have errors.A general rule of thumb is to always define functions, variables, objects and classes before using them, to avoid surprises.Suppose we have a function:function bark() { alert('wof!') }Due to hoisting, we can technically invoke bark() before it ...
In which ArkTS file is the lifecycle callback function of the EntryFormAbility invoked? How do I update an ArkTS widget using a UIAbility? Can a UIAbility be visible only to applications in a trustlist? What should I do when error code 16000001 is returned during the call of start...
functionwithDataFetching(WrappedComponent,fetchData){returnclassextendsReact.Component{constructor(props){super(props);this.state={data:null,isLoading:true,error:null};}asynccomponentDidMount(){try{constdata=awaitfetchData();this.setState({data,isLoading:false});}catch(error){this.setState({error,is...