JS rawat
Chapters-Covered
Q1: what is javascript? What is the role of javascript engine?
Q2: what are client side and server side?
Q4: what are some important string operations in js?
Q5: What is DOM? What is the difference between HTML and DOM?
Q6: What are selectors in JS?
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Q7: What is the difference between getElementById,getElementByClassName and getElementByTagName?
Q8: What are data types in JS?
Q9: What are operations? What are the types of operators in JS?
Q10: What are the types of conditions statements in JS?
Q11: What is loop? What are the types of loops in JS?
Q12: What are Functions in JS? What are the types of function?
Q13: What are Arrow Functions in JS? What is it use?
Q14: What are Arrays in JS? How to get, add & remove elements from arrays?
Q15: What are Objects in JS?
Q16: What is Scope in JS?
Q17: What is Hoisting in JS?
Q18: What is Error Handling in JS?
Q19: What is JSON?
Q20: What is asynchronous programming in JS? What is its use?
Chapter 2 Variables and Datatypes:
Q21: What are variables? what is the difference between var, let and const?
Q22: What are datatypes in JS?
Q23: What is the difference between primitive and non primitive datatypes?
Q24: What is the difference between null and undefined?
Q25: What is the use of typeof operator?
Q26: What is type coercion in jS?
Chapter:3 Operators & Conditions
Q27: What are operators? What are the types of operators in JS?
Q28: What is the difference between unary, binary, and ternary operators?
Q29: What is short-circuit evaluation in JS?
Q30: What is operator precedence?
Q31: What are the types of conditions statements in JS?
Q32: When to use which type of conditions statements in real applications?
Q33: What is the difference between == and ===?
Q34: What is the difference between Spread and Rest operator in JS?
Chapter:4 Arrays
Q35: What are Arrays in JS? How to get, add & remove elements from arrays?
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Q36: What is the indexOf() method of an Array?
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Q37: What is the difference between find() and filter() methods of an Array?
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Q38: What is the slice() method of an Array?
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Q39: What is the difference between push() and concat() methods of an Array?
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Q40: What is the difference between pop() and shift() methods of an Array?
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Q41: What is the splice() method of an Array?
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Q42: What is the difference between the slice() and splice() methods of an Array?
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Q43: What is the difference map() and forEach() array methods of an Array?
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Q44: How to sort and reverse an array?
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Q45: What is Array Destructuring in JS?
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Q46: What are array-like objects In JS?
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Q47: How to convert an array-like object into an array?
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Chapter 5: Loops
Q. What is a loop? What are the types of loops in JS?
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Q. What is the difference between while and for loops?
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Q. What is the difference between while and do-while loops?
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Q. What is the difference between break and continue statement?
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Q. What is the difference between for and for...of loop in JS?
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Q. What is the difference between for...of and for...in loop?
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Q. What is forEach method? Compare it with for...of and for...in loop?
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Q. When to use for...of loop and when to use forEach method in applications?
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Chapter 6: Functions
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Q. What are Functions in JS? What are the types of function?
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Q. What is the difference between named and anonymous functions? When to use what in applications?
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Q. What is function expression in JS?
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Q. What are Arrow Functions in JS? What is it use?
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Q. What are Callback Functions? What is it use?
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Q. What is Higher-order function In JS?
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Q. What is the difference between arguments and parameters?
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Q. In how many ways can you pass arguments to a function?
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Chapter 7: Strings
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Q. What is a String?
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Q. What are template literals and string interpolation in strings?
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Q. What is the difference between single quotes ("), double quotes ("") & backticks (")?
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Q. What are some important string operations in JS?
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Q. What is string immutability?
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Q. In how many ways you can concatenate strings?
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Chapter 8: DOM
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Q. What is DOM? What is the difference between HTML and DOM?
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Q. How do you select, modify, create and remove DOM elements?
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Q. What are selectors in JS?
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Q. What is the difference between getElementByld, getElementsByClassName and getElementsByTagName?
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Q. What is the difference between querySelector() and querySelectorAll()?
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Q. What are the methods to modify elements properties and attributes?
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Q. What is the difference between innerHTML and textContent?
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Q. How to add and remove properties of HTML elements in the DOM using JS?
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Q. How to add and remove style from HTML elements in DOM using JS?
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Q. How to create new elements in DOM using JS? What is the difference between createElement() and cloneNode()?
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Q. What is the difference between createElement() and create TextNode()?
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Chapter 9: Error Handling
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Q. What is Error Handling in JS?
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Q. What is the role of finally block in JS?
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Q. What is the purpose of the throw statement in JS?
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Q. What is Error propagation in JS?
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Q. What are the best practices for error handling?
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Q. What are the different types of errors In JS?
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Chapter 10: Objects
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Q. What are Objects in JS?
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Q. In how many ways we can create an object?
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Q. What is the difference between an array and an object?
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Q. What is the difference between array and objects?
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Q. How do you add or modify or delete properties of an object?
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Q. Explain the difference between dot notation and bracket notation?
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Q. What are some common methods to iterate over the properties of an object?
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Q. How do you check if a property exists in an object?
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Q. How do you clone or copy an object?
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Q. What is the difference between deep copy and shallow copy in JS?
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Q. What is Set Object in JS?
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Q. What is Map Object in JS?
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Q. What is the difference between Map and Object in JS?
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Chapter 11: Events
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Q. What are Events? How are events triggered?
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Q. What are the types of events in JS?
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Q. What is Event Object in JS?
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Q. What is Event Delegation in JS?
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Q. What is Event Bubbling In JS?
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Q. How can you stop event propagation or event bubbling in JS?
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Q. What is Event Capturing in JS?
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Q. What is the purpose of the event.preventDefault() method in JS?
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Q. What is the use of "this" keyword in the context of event handling in JS?
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Q. How to remove an event handler from an element in JS?
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Chapter 12: Closures
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Q. Explain the concept of Lexical Scoping?
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Q. What is Closure?
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Q. What are the benefits of Closures?
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Q. What is the concept of Encapsulation in the context of closures?
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Q. What are the disadvantage or limitations of Closures?
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Q. How can you release the variable references or closures from memory?
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Q. What is the difference between a Regular Function and a Closure?
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Chapter 13: Asynchronous programming - Basics
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Q. What is asynchronous programming in JS? What is its use?
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Q. What is the difference between synchronous and asynchronous programming?
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Q. What are the techniques for achieving asynchronous operations in JS?
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Q. What is setTimeout()? How is it used to handle asynchronous operations?
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Q. What is setInterval()? How is it used to handle asynchronous operations?
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Q. What is the role of callbacks in fetching API data asynchronously?
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Q. What is callback hell? How can it be avoided?
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Chapter 14: Asynchronous programming - Promises
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Q. What are Promises in JavaScript?
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Q. How to implement Promises in JavaScript?
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Q. When to use Promises in real applications?
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Q. What is the use of Promise.all() method?
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Q. What is the use of Promise.race() method?
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Q. What is the difference between Promise.all() and Promise.race()?
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Chapter 15: Asynchronous Programming - Async Await JS
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Q. What is the purpose of async/ await? Compare it with Promises?
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Q. Explain the use of async and await keywords in JS?
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Q. Can we use async keyword without await keyword and vice versa?
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Q. How do you handle errors in async/ await functions?
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Chapter 16: Browser APIs & Web Storage
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Q. What is a window object?
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Q. What are Browser APIs in JS?
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Q. What is Web Storage, and its use? How many types of web storage are there?
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Q. What is Local Storage? How to store, retrieve and remove data from it?
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Q. What is Session Storage? How to store, retrieve and remove data from it?
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Q. What is the difference between LocalStorage and SessionStorage?
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Q. How much data can be stored in localStorage and sessionStorage?
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Q. What are cookies? How do you create and read cookies?
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Q. What is the difference between cookies and web storage?
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Q. When to use cookies and when to use web storage?
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Chapter 17: Classes, Constructors, this & Inheritance
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Q. What are Classes in JS?
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Q. What is a constructor?
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Q. What are constructor functions?
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Q. What is the use of this keyword?
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Q. Explain the concept of prototypal inheritance?
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Chapter 18: ECMAScript & Modules
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Q. What is ES6? What are some new features introduced by it?
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Q. What are Modules in JS?
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Q. What is the role of export keyword?
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Q. What are the advantages of modules?
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Q. What is the difference between named exports and default exports?
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Q. What is the difference between static and dynamic imports?
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Q. What are module bundlers?
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Chapter 19: Security & Performance
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Q. What is eval() function in JS?
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Q. What is XSS (Cross-Site Scripting) attack?
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Q. What is SQL Injection attack?
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Q. What are some best practices for security in JS?
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Q. What are the best practices for improving performance in JS?
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Chapter 20: Scenario based - Tricky Short Questions
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Q. How to execute a piece of code repeatedly after some fix time?
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Q. How to handle asynchronous operations In JS?
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Q. How to manipulate and modify CSS styles of HTML elements dynamically?
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Q. How to handle errors and exceptions in your code?
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Q. How to store key-value pairs & efficiently access and manipulate the data?
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Q. How to iterate over elements in an array and perform a specific operation on each element?
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Q. How to dynamically add or remove elements from a web page?
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Q. What method is used to retrieve data from an external API?
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Q. How to manage the state in a web application?
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Q. How to implement a queue or a stack like data structure in JS?
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Chapter 20: Scenario based – Tricky Short Questions
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Q. How do you attach an event handler to an HTML element?
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Q. How to perform actions based on keyboard events in JS?
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Q. How to fetch data from multiple APIs in parallel and process the results together?
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Q. What are the methods to manipulate JSON data efficiently?
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Q. How to get the current URL of a webpage?
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Q. How do you find the length of an array in JS?
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Q. How to create a copy of an array?
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Q. How do you access individual characters in a string?
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Q. How can you check if a string contains a specific substring?
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Q. Can you modify the value of a variable captured in a Closure?
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Chapter 21: Scenario based - Feature Development
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Q. How to validate user input as they type in a form?
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Q. How to implement pagination for displaying large sets of data?
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Q. How to implement drag-and-drop functionality for elements on a web page?
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Q. How to implement a feature that allows users to search for specific items in a large dataset?
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Q. How to implement a feature that allows users to perform live search suggestions as they type?
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Q. How to implement a real-time chat application using JS.
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Q. How to create an infinite scrolling feature using JS when a user reaches the bottom of a webpage?
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Q. How to implement a toggle switch that changes the theme (light/dark mode) of a website when clicked.
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Q. How to use JS to dynamically update date in real time on webpage?
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Q. How to prevent a form from being submitted without required fields being filled?
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Chapter 12: Coding
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Q. Write a function that returns the reverse of a string?
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Q. Write a function that returns the longest word in the sentence.
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Q. Write a function that checks whether a given string is a palindrome or not?
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Q. Write a function to remove duplicate elements from an array.
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Q. Write a function that checks whether two strings are anagrams or not?
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Q. Write a function that returns the number of vowels in a string.
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Q. Write a function to find the largest number in an array.
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Q. Write a function to check if a given number is prime or not?
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Q. Write a function to calculate the factorial of a number.
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Q. Write a program to remove all whitespace characters from a string.
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Q. Write a function to find the sum of all elements in an array
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Chapter 12: Coding
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Q. Write a function to find the average of an array of numbers.
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Q. Write a function to sort an array of numbers in ascending order.
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Q. Write a function to check if a given array is sorted in ascending order or not.
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Q. Write a function to merge two arrays into a single sorted array.
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Q. Write a function to remove a specific element from an array.
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Q. Write a function to find the second largest element in an array.
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Q. Write a function to reverse the order of words in a given sentence.
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Q. Write a function to find the longest common prefix among an array of strings.
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Q. Write a function to find the intersection of two arrays.
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Q. Write a function to calculate the Fibonacci sequence up to a given number.
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