Essential JavaScript Interview Questions for Developers
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Course
Cs202 (JAVASCRIPT)
Institution
Sri Venkateshwara College Of Engineering
Prepare for your next web development job interview with this comprehensive PDF featuring 100+ JavaScript interview questions. Covering fundamental concepts like closures, async/await, promises, event loops, and more advanced topics like prototypes, hoisting, and JavaScript design patterns. Whether...
6 Essential Questions 20
6.1 What is the drawback of creating true private methods in JavaScript? . . . . . . . . . . . . . . . . . . . . . . . . 20
6.2 What will be the output of the code below? . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20
6.3 What is a "closure" in JavaScript? Provide an example. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21
6.4 Write a mul function which will produce the following outputs when invoked: . . . . . . . . . . . . . . . . . . . 21
6.5 How to empty an array in JavaScript? . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22
6.5.1 One Solution . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22
6.6 What will be the output of the following code? . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22
6.7 What is the difference between the function declarations below? . . . . . . . . . . . . . . . . . . . . . . . . . . 22
6.8 What will be the output of the code below? . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 23
6.9 Consider the following code: . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 23
6.10 Hoisting . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 23
6.10.1 What’s the result of executing this code and why? . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 23
7 General Questions 25
7.1 What is ‘this’ keyword in JavaScript? . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 25
7.2 What is the difference between ViewState and SessionState? . . . . . . . . . . . . . . . . . . . . . . . . . . . . 25
7.3 Does JavaScript support automatic type conversion? . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 25
7.4 How can you read and write a file using JavaScript? . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 25
7.5 How can you read and write a file using JavaScript? . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 25
7.6 What is the use of Void(0)? . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 26
7.7 What are JavaScript Cookies? . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 26
7.8 How can a particular frame be targeted, from a hyperlink, in JavaScript? . . . . . . . . . . . . . . . . . . . . . . 26
7.9 Explain the role of deferred scripts in JavaScript? . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 26
7.10 How can a particular frame be targeted, from a hyperlink, in JavaScript? . . . . . . . . . . . . . . . . . . . . . . 26
7.11 What does a timer do and how would you implement one? . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 26
7.12 Explain the concept of unobtrusive Javascript? . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 27
7.13 What is "event delegation" and how does it work? . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 27
7.14 What is the importance of tag? . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 27
7.15 What is the difference between window.onload and onDocumentReady? . . . . . . . . . . . . . . . . . . . . . . 27
8 A Final Note 28
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