Tata Technologies Reactjs Developer Interview Questions and Answers

React and Javascript

Coding test with technical discussion

Q1. Basic question from React JS, Redux, Javascript, HTML and CSS.
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Q2. Core concept like difference between virtual dom and real dom.
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Q3. What is Redux and flow of Redux. Difference between context api and Redux.
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Q1. Project related questions like what had you done in previous project.
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Q2. Some scenarios based questions.
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Q1. General HR questions.
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Q1. Basic Javascript Questions
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Q2. JS Array Questions
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Q1. Alternative way for prop drilling
Ans. 
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.
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Q1. Asked four programs
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Q1. Salary discussion
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Q1. What is hosting and closer
Ans. 
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.
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Q2. What is difference between var let and const give me an explanation on what block scope
Ans. 
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.
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Q3. What is asynchronous and how it works
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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
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Q4. Tell me the output 1)a = 20; console.log(a); var a; 2)b=10; console.log(b); let b; 3)let a =5; if(a<5){ let b = " a lessthen 5"; }else{ let b = "b is grater then 5"; } console.log(b);
Ans. 
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
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Q5. Give a div with text and display center of the page and apply animation using HTML and css
Ans. 
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
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Q6. What are semantic tags and explain

Ans. 

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

  ,

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