Here are 50 JavaScript interview questions that you can use for your YouTube shorts or study material:
### Basic Questions1. What is JavaScript, and how is it different from Java?
2. What are JavaScript data types?3. Explain the difference between
4. What is the use of the
6. What are JavaScript functions, and how do you declare them?7. What is the difference between function expressions and function declarations?
8. Explain arrow functions and their advantages.9. What is the scope of a variable in JavaScript?
10. What are closures in JavaScript?
### Intermediate Questions11. What is the event loop in JavaScript?
12. How does JavaScript handle asynchronous operations?13. Explain the concept of promises in JavaScript.
14. What are async/await in JavaScript?15. How do you create and use modules in JavaScript?
16. What are template literals, and how do you use them?17. Explain the difference between
18. What is prototypal inheritance in JavaScript?19. What is the difference between
20. How do you handle errors in JavaScript?
### Advanced Questions21. What is event delegation in JavaScript?
22. Explain the concept of hoisting in JavaScript.23. What are higher-order functions in JavaScript?
24. What is a pure function in JavaScript?25. How do you debounce and throttle functions in JavaScript?
26. What is the difference between
28. What is the
30. How does the JavaScript garbage collection mechanism work?
### DOM Manipulation and Events31. What is the DOM in JavaScript?
32. How do you select elements in the DOM?33. What are event listeners, and how do you add them?
34. Explain the difference between event bubbling and event capturing.35. How do you create and dispatch custom events in JavaScript?
36. What is the purpose of the
38. What are the different ways to handle events in JavaScript?39. How do you work with forms and form validation in JavaScript?
40. What is the Shadow DOM?
### Miscellaneous41. What is JSON, and how do you work with it in JavaScript?
42. What are Web APIs, and how do you use them?43. How do you handle AJAX requests in JavaScript?
44. What is the Fetch API?45. How do you work with cookies in JavaScript?
46. What is localStorage, and how does it differ from sessionStorage?47. Explain the concept of
48. How do you handle cross-browser compatibility in JavaScript?49. What is a polyfill, and when would you use one?
50. What are ES6 features, and why are they important?
These questions cover a range of topics from basic to advanced JavaScript concepts, including syntax, DOM manipulation, asynchronous programming, and more. They can be useful for both interview preparation and content creation.
### Basic Questions1. What is JavaScript, and how is it different from Java?
2. What are JavaScript data types?3. Explain the difference between
var, let, and const.4. What is the use of the
typeof operator in JavaScript?5. How does the == and === operators differ in JavaScript?6. What are JavaScript functions, and how do you declare them?7. What is the difference between function expressions and function declarations?
8. Explain arrow functions and their advantages.9. What is the scope of a variable in JavaScript?
10. What are closures in JavaScript?
### Intermediate Questions11. What is the event loop in JavaScript?
12. How does JavaScript handle asynchronous operations?13. Explain the concept of promises in JavaScript.
14. What are async/await in JavaScript?15. How do you create and use modules in JavaScript?
16. What are template literals, and how do you use them?17. Explain the difference between
call(), apply(), and bind().18. What is prototypal inheritance in JavaScript?19. What is the difference between
null and undefined?20. How do you handle errors in JavaScript?
### Advanced Questions21. What is event delegation in JavaScript?
22. Explain the concept of hoisting in JavaScript.23. What are higher-order functions in JavaScript?
24. What is a pure function in JavaScript?25. How do you debounce and throttle functions in JavaScript?
26. What is the difference between
map(), filter(), and reduce()?27. What are generator functions in JavaScript?28. What is the
this keyword, and how does it work?29. What are JavaScript proxies, and how do you use them?30. How does the JavaScript garbage collection mechanism work?
### DOM Manipulation and Events31. What is the DOM in JavaScript?
32. How do you select elements in the DOM?33. What are event listeners, and how do you add them?
34. Explain the difference between event bubbling and event capturing.35. How do you create and dispatch custom events in JavaScript?
36. What is the purpose of the
preventDefault() method in events?37. How do you manipulate the DOM using JavaScript?38. What are the different ways to handle events in JavaScript?39. How do you work with forms and form validation in JavaScript?
40. What is the Shadow DOM?
### Miscellaneous41. What is JSON, and how do you work with it in JavaScript?
42. What are Web APIs, and how do you use them?43. How do you handle AJAX requests in JavaScript?
44. What is the Fetch API?45. How do you work with cookies in JavaScript?
46. What is localStorage, and how does it differ from sessionStorage?47. Explain the concept of
strict mode in JavaScript.48. How do you handle cross-browser compatibility in JavaScript?49. What is a polyfill, and when would you use one?
50. What are ES6 features, and why are they important?
These questions cover a range of topics from basic to advanced JavaScript concepts, including syntax, DOM manipulation, asynchronous programming, and more. They can be useful for both interview preparation and content creation.
β€1π₯1
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<meta name="viewport" content="width=device-width, initial-scale=1.0">
<title>Table with Cell Dividers and Rounded Corners</title>
<link rel="stylesheet" href="style.css">
</head>
<body>
<div class="table-container">
<table>
<thead>
<tr>
<th>Header 1</th>
<th>Header 2</th>
<th>Header 3</th>
</tr>
</thead>
<tbody>
<tr>
<td>Row 1, Cell 1</td>
<td>Row 1, Cell 2</td>
<td>Row 1, Cell 3</td>
</tr>
<tr>
<td>Row 2, Cell 1</td>
<td>Row 2, Cell 2</td>
<td>Row 2, Cell 3</td>
</tr>
</tbody>
</table>
</div>
</body>
</html>
<html lang="en">
<head>
<meta charset="UTF-8">
<meta name="viewport" content="width=device-width, initial-scale=1.0">
<title>Table with Cell Dividers and Rounded Corners</title>
<link rel="stylesheet" href="style.css">
</head>
<body>
<div class="table-container">
<table>
<thead>
<tr>
<th>Header 1</th>
<th>Header 2</th>
<th>Header 3</th>
</tr>
</thead>
<tbody>
<tr>
<td>Row 1, Cell 1</td>
<td>Row 1, Cell 2</td>
<td>Row 1, Cell 3</td>
</tr>
<tr>
<td>Row 2, Cell 1</td>
<td>Row 2, Cell 2</td>
<td>Row 2, Cell 3</td>
</tr>
</tbody>
</table>
</div>
</body>
</html>
π1π₯1
body {
font-family: Arial, sans-serif;
background-color: #f0f0f0;
display: flex;
justify-content: center;
align-items: center;
height: 100vh;
margin: 0;
}
.table-container {
overflow: hidden;
border-radius: 10px; /* Rounded corners */
box-shadow: 0 4px 8px rgba(0, 0, 0, 0.1); /* Optional shadow */
}
table {
width: 100%;
border-collapse: collapse; /* Ensures borders are merged */
}
th,
td {
padding: 12px;
text-align: left;
border: 1px solid #ddd; /* Divider for each cell */
}
th {
background-color: #f4f4f4;
font-weight: bold;
}
font-family: Arial, sans-serif;
background-color: #f0f0f0;
display: flex;
justify-content: center;
align-items: center;
height: 100vh;
margin: 0;
}
.table-container {
overflow: hidden;
border-radius: 10px; /* Rounded corners */
box-shadow: 0 4px 8px rgba(0, 0, 0, 0.1); /* Optional shadow */
}
table {
width: 100%;
border-collapse: collapse; /* Ensures borders are merged */
}
th,
td {
padding: 12px;
text-align: left;
border: 1px solid #ddd; /* Divider for each cell */
}
th {
background-color: #f4f4f4;
font-weight: bold;
}
π1π₯1π1
image.png
117 KB
What are Arithmetic Operators in JavaScript.
π₯1π₯°1
50 questions.pdf
226.5 KB
From basics to advanced, these 50 JavaScript interview questions cover it all!
π1
Ans-
β’ eval() is a function in many programming languages, including JavaScript.
β’ Itβs short for evaluate and takes a string as an argument and executes it as if it were actual code.
For example-
let x = 10;
let y = 20;
let result = eval('x + y');
console.log(result); // This will output 30
However, eval() can be risky if itβs used with arbitrary or untrusted strings because it can execute any code passed into it, potentially leading to security vulnerabilities or unexpected behavior.
In general, Itβs recommended to avoid using eval() whenever possible, especially with user generated input.
β’ eval() is a function in many programming languages, including JavaScript.
β’ Itβs short for evaluate and takes a string as an argument and executes it as if it were actual code.
For example-
let x = 10;
let y = 20;
let result = eval('x + y');
console.log(result); // This will output 30
However, eval() can be risky if itβs used with arbitrary or untrusted strings because it can execute any code passed into it, potentially leading to security vulnerabilities or unexpected behavior.
In general, Itβs recommended to avoid using eval() whenever possible, especially with user generated input.
π1
Q.264 What is appendChild method in JavaScript.pdf
18.5 KB
ππ©π©ππ§π ππ‘π’π₯π π¦πππ‘π¨π π’π§ πππ―ππππ«π’π©π