KPMG India Front end Developer Interview Questions and Answers

Q1. Hoisting concept with examples and guess the output
Ans. 
Hoisting is a JavaScript mechanism where variable and function declarations are moved to the top of their containing scope.
• Variable declarations are hoisted but not their initializations.

• Function declarations are fully hoisted.

• Example: console.log(myVar); var myVar = 10; // Output: undefined

• Example: console.log(myFunc()); function myFunc() { return 'Hello!'; } // Output: Hello!
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Q2. Map functionality with a call back function
Ans. 
Using map function to apply a callback function to each element in an array
• Map function is used to iterate over an array and apply a callback function to each element

• The callback function can perform operations on each element and return a new value

• Example: arr.map(item => item * 2) will double each element in the array
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Q3. Copy object, spread operator usage . Deep copy, sallow copy
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Q4. Flexbox vs grid, dom, box model,
Ans. 
Flexbox is best for one-dimensional layouts, Grid is best for two-dimensional layouts, DOM is the structure of a webpage, Box model is the layout of elements.
• Flexbox is best for creating one-dimensional layouts like navigation bars or sidebars.

• Grid is best for creating two-dimensional layouts like grids of images or cards.

• DOM (Document Object Model) is the structure of a webpage, representing the elements as objects.

• Bo...read more
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Q5. React optimization, why React,
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2 moderate DSA questions and a Question on React on Api's to fetch data

Q1. What are closures with examples ?
Ans. 
Closures are functions that have access to their own scope, as well as the scope in which they were defined.
• Closures allow functions to access variables from their outer function even after the outer function has finished executing.

• Closures are commonly used in event handlers and callbacks.

• Example: function outerFunction() { let outerVar = 'I am outer'; return function innerFunction() { console.log(outerVar); }; }
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Q2. How to get updated content on scroll on e-commerce app?
Ans. 
Use infinite scrolling to fetch new content as user scrolls down the page.
• Implement infinite scrolling to load more products as user scrolls down

• Make AJAX calls to fetch new content from the server

• Update the DOM with the new content dynamically
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Q1. Array linked list queue
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Q1. How to handle error in javascript
Ans. 
Error handling in JavaScript involves using try-catch blocks, throwing custom errors, and using error objects.
• Use try-catch blocks to catch and handle errors

• Throw custom errors using the throw keyword

• Use error objects like Error, SyntaxError, TypeError, etc. for specific types of errors
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Q2. Explain closure
Ans. 
Closure is a function that retains access to variables from its parent scope even after the parent function has finished executing.
• Closure allows a function to access and manipulate variables from its outer scope.

• It forms a 'closed-over' scope that persists even after the outer function has finished executing.

• Closures are commonly used in event handlers, callbacks, and asynchronous code.

• Example: function outerFunction(...read more
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Q1. Tell me about yourself
Ans. 
I am a passionate front end developer with 5 years of experience in creating user-friendly and responsive web applications.
• 5 years of experience in front end development

• Proficient in HTML, CSS, JavaScript, and various front end frameworks

• Strong understanding of UI/UX principles

• Experience in creating responsive web applications

• Passionate about staying updated with the latest web technologies
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Basic angular questions like-lazy loading, == === operator etc

Q1. Map function , hashmap
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Q1. JavaScript Related Questions
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Q2. ReactJs Related Questions
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Q1. Reactjs Use Effects and UseRef
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Q2. JavaScript Closures,Map,CallBack
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