HCLTech Front end Developer Interview Questions and Answers

Q1. Reverse the string
Ans. 
Reverse a given string
• Use built-in methods like split(), reverse(), and join() to reverse the string

• Alternatively, loop through the string from end to start and build a new reversed string
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It was quit well and easy based on alphabtical or programming based questions

2 3 coding questions on patterend question

Q1. How to handle state in functional components.
Ans. 
State in functional components can be managed using the useState hook in React.
• Use the useState hook to declare state variables in functional components.

• useState returns an array with the current state value and a function to update that value.

• Example: const [count, setCount] = useState(0);

• State variables should be immutable, so always use the setter function to update them.
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Q2. What is event loop in javascript.
Ans. 
Event loop in JavaScript is responsible for handling asynchronous operations by executing callback functions in a non-blocking way.
• Event loop is a mechanism that allows JavaScript to perform non-blocking operations.

• It continuously checks the call stack and the callback queue to see if there are any functions that need to be executed.

• If the call stack is empty, it takes the first function from the callback queue and pus...read more
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Q3. What is hosting in Javascript
Ans. 
Hosting in JavaScript refers to the process of declaring a variable or function before it is used in the code.
• Hosting allows you to use variables and functions before they are declared in the code.

• Variables are hoisted to the top of their scope, while functions are fully hoisted.

• Example: console.log(myVar); var myVar = 10; This will not throw an error because 'myVar' is hoisted to the top of the scope.
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Q1. Based on html,css Javascript
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Q2. Based on ReactJs
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Q3. Javascript promise method
Ans. 
JavaScript Promise is an object representing the eventual completion or failure of an asynchronous operation.
• Promises are used to handle asynchronous operations such as fetching data from an API.

• They have three states: pending, fulfilled, or rejected.

• Promises can be chained using .then() and .catch() methods.

• Promises can also be created using the Promise constructor.
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Q4. Javascript callback funtions
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Based on html, Css, Javascript and React-Js

Q1. What is Event Loop ? How it works?
Ans. 
Event Loop is a mechanism in JavaScript that manages the execution of code and handles asynchronous operations.
• Event Loop continuously checks the call stack and the message queue.

• If the call stack is empty, it takes the first message from the queue and pushes it onto the call stack.

• If the message is a callback function, it is executed and removed from the call stack.

• If the message is not a callback function, it is pass...read more
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Q2. Make a set of 6 boxes Responsive in CSS
Ans. 
Use CSS to make a set of 6 boxes responsive
• Use percentage or viewport units for width and height

• Use media queries to adjust styles for different screen sizes

• Consider using flexbox or grid for layout

• Avoid using fixed pixel values

• Test on different devices and browsers

• Use CSS frameworks like Bootstrap or Foundation for easier implementation
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Q3. Hoisting & Closures Questions
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Q1. What's your Salary expectations ?
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How revere the string without using reverse method

Split duplication from the array

Q1. Salary negotiation, asked about my previous employer
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Q2. Speak bold at time of salary negotiation
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