Most Asked JavaScript Interview (100 Q&A) PDF

JS Interview Questions and Answers

JavaScript is a popular programming language that is used for front-end and back-end web development. If you’re looking to land a job as a JavaScript developer, you’ll need to be well-prepared for the interview process.

To help you prepare, we have compiled a list of the most commonly asked JavaScript interview questions and answers. This PDF contains 100 Q&A that cover topics such as JavaScript basics, DOM manipulation, event handling, asynchronous programming, closures, and more.

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JavaScript Interview Questions PDF

By studying these questions and answers, you’ll be well-equipped to tackle any JavaScript interview with confidence. So, let’s dive in and start preparing for your next JavaScript interview!

Contents

1. What is JavaScript?
2. What are the data types in JavaScript?
3. What is the difference between null and undefined?
4. What is the DOM in JavaScript?
5. What is an event in JavaScript?
6. What is an anonymous function in JavaScript?
7. What are closures in JavaScript?
8. What is the difference between == and === in JavaScript?
9. What is hoisting in JavaScript?
10. What is the this keyword in JavaScript?
11. What are the different ways to define a function in JavaScript?
12. What is the purpose of the let keyword in JavaScript?
13. What is the purpose of the const keyword in JavaScript?
14. What are template literals in JavaScript?
15. What are JavaScript promises?
16. What is the async/await syntax in JavaScript?
17. What are arrow functions in JavaScript?
18. What is event delegation in JavaScript?
19. What is the purpose of the map() function in JavaScript?
20. What is the purpose of the filter() function in JavaScript?
21. What is the purpose of the reduce() function in JavaScript?
22. What is a callback function in JavaScript?
23. What is the difference between let and var in JavaScript?
24. What are JavaScript modules?
25. What is object destructuring in JavaScript?
26. What are JavaScript classes?
27. What is inheritance in JavaScript?
28. What are JavaScript getters and setters?
29. What is the purpose of the try/catch statement in JavaScript?
30. What is the difference between let and const in JavaScript?
31. What is the purpose of the forEach() function in JavaScript?
32. What is the purpose of the localStorage object in JavaScript?
33. What are arrow functions? How are they different from regular functions?
34. What is the purpose of the setTimeout() function in JavaScript?
35. What is event bubbling in JavaScript?
36. What is the purpose of the fetch() function in JavaScript?
37. What is the difference between null and undefined?
38. What is event propagation in JavaScript?
39. What is the purpose of the Object.keys() function in JavaScript?
40. What is the difference between null and undefined in JavaScript?
41. What is the purpose of the addEventListener() method in JavaScript?
42. What is the purpose of the parentNode property in JavaScript?
43. What is the purpose of the querySelector() method in JavaScript?
44. What is the purpose of the querySelectorAll() method in JavaScript?
45. What is the difference between querySelector() and getElementById()?
46. What is the difference between function declarations and function expressions in JavaScript?
47. What is the purpose of the bind() method in JavaScript?
48. What is the purpose of the call() method in JavaScript?
49. What is the purpose of the apply() method in JavaScript?
50. What is the purpose of the Array.isArray() method in JavaScript?
51. What is event capturing in JavaScript?
52. What is event delegation in JavaScript?
53. What is the purpose of the startsWith() method in JavaScript?
54. What is the purpose of the endsWith() method in JavaScript?
55. What is the purpose of the includes() method in JavaScript?
56. What is the purpose of the padStart() method in JavaScript?
57. What is the purpose of the padEnd() method in JavaScript?
58. What is the purpose of the charAt() method in JavaScript?
59. What is the purpose of the charCodeAt() method in JavaScript?
60. What is the purpose of the String.fromCharCode() method in JavaScript?
61. What is the purpose of the JSON.stringify() method in JavaScript?
62. What is the purpose of the JSON.parse() method in JavaScript?
63. What is the purpose of the encodeURIComponent() function in JavaScript?
64. What is the purpose of the decodeURIComponent() function in JavaScript?
65. What is the purpose of the Math.random() function in JavaScript?
66. What is the purpose of the Math.floor() function in JavaScript?
67. What is the purpose of the Math.ceil() function in JavaScript?
68. What is the purpose of the Math.round() function in JavaScript?
69. What is the purpose of the Math.max() function in JavaScript?
70. What is the purpose of the Math.min() function in JavaScript?
71. What is the purpose of the Math.pow() function in JavaScript?
72. What is the purpose of the Math.sqrt() function in JavaScript?
73. What is the purpose of the Math.abs() function in JavaScript?
74. What is the purpose of the Math.floor() and Math.random() functions together?
75. What is the purpose of the Date() constructor in JavaScript?
76. What is the purpose of the getFullYear() method in JavaScript Date objects?
77. What is the purpose of the getMonth() method in JavaScript Date objects?
78. What is the purpose of the getDate() method in JavaScript Date objects?
79. What is the purpose of the getDay() method in JavaScript Date objects?
80. What is the purpose of the getHours() method in JavaScript Date objects?
81. What is the purpose of the getMinutes() method in JavaScript Date objects?
82. What is the purpose of the getSeconds() method in JavaScript Date objects?
83. What is the purpose of the getFullYear() and getMonth() methods together in JavaScript Date objects?
84. What is the purpose of the setFullYear() method in JavaScript Date objects?
85. What is the purpose of the setMonth() method in JavaScript Date objects?
86. What is the purpose of the setDate() method in JavaScript Date objects?
87. What is the purpose of the setHours() method in JavaScript Date objects?
88. What is the purpose of the setMinutes() method in JavaScript Date objects?
89. What is the purpose of the setSeconds() method in JavaScript Date objects?
90. What is the purpose of the toLocaleString() method in JavaScript Date objects?
91. What is the purpose of the toDateString() method in JavaScript Date objects?
92. What is the purpose of the getTime() method in JavaScript Date objects?
93. What is the purpose of the setTime() method in JavaScript Date objects?
94. What is the purpose of the setTimeout() function in JavaScript?
95. What is the purpose of the setInterval() function in JavaScript?
96. What is the purpose of the clearTimeout() function in JavaScript?
97. What is the purpose of the clearInterval() function in JavaScript?
98. What is the purpose of the isNaN() function in JavaScript?
99. What is the purpose of the isFinite() function in JavaScript?
100. What is the purpose of the parseFloat() function in JavaScript?

Nu Of Pages

12 Pages

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