Statusneo Reactjs Developer Interview Questions and Answers

Redux is a predictable state container for JavaScript apps. It helps manage the state of an application in a more organized way.

• Redux is a state management tool commonly used with React to manage the state of an application.

• It follows a unidirectional data flow, where the state is stored in a single store.

• Actions are dispatched to update the state, and reducers specify how the state should change in response to actions...read more

Context API is used in React to pass data through the component tree without having to pass props down manually at every level.

• Avoids prop drilling by providing a way to share values like themes, user data, etc. across the component tree.

• Helps in managing global state in React applications.

• Context API consists of Provider and Consumer components to provide and consume the context data.

• Can be used for theming, localizat

Context API or Redux can be used as alternative ways for prop drilling in React.

• Use Context API to pass data down the component tree without having to manually pass props at every level.

• Implement Redux to manage global state and access data from any component without prop drilling.

• Consider using React's useContext hook with Context API for a simpler way to consume context in functional components.

Hosting is the process of storing a website or application on a server, while closure is a function that retains access to variables from its parent scope.

• Hosting involves storing a website or application on a server to make it accessible on the internet.

• Closure is a function that retains access to variables from its parent scope, even after the parent function has finished executing.

var, let, and const are used to declare variables in JavaScript. var has function scope, let has block scope, and const is a constant with block scope.

• var has function scope, meaning it is accessible throughout the function it is declared in.

• let has block scope, meaning it is only accessible within the block it is declared in.

• const is similar to let in terms of block scope, but the value cannot be reassigned.

Asynchronous programming allows tasks to run independently of the main program flow, improving performance and responsiveness.

• Asynchronous code does not block the main thread, allowing other tasks to continue while waiting for a response.

• Callbacks, promises, and async/await are common ways to handle asynchronous operations in JavaScript.

• Example: fetching data from an API while the rest of the application continues to r

The output for the given code snippets will be: 1) 20 2) ReferenceError: Cannot access 'b' before initialization 3) ReferenceError: b is not defined

• In the first snippet, variable 'a' is declared using 'var' after it is assigned a value, so it logs 20 without any issues.

• In the second snippet, variable 'b' is declared using 'let' after it is assigned a value, so it throws a ReferenceError as 'b' is accessed before initia...read more

Use HTML and CSS to center a div with text and apply animation

• Create a div element with text inside

• Apply CSS to center the div on the page using flexbox or margin auto

• Use CSS animations like keyframes to add animation effects

Semantic tags are HTML tags that provide meaning to the content they enclose, helping search engines and screen readers understand the structure of a webpage.

• Semantic tags help improve SEO by providing context to search engines.

• They also improve accessibility for screen readers by clearly defining the structure of a webpage.

• Examples of semantic tags include

  ,