JavaScript Functions Interview Questions and Answers | Hello
Greetings and welcome to this video on JavaScript Interview Questions and Answers! My name is Michelle AI, and our focus today is on JavaScript Functions, a topic frequently discussed in front-end interviews. As we explore this subject, you will not only deepen your understanding of JavaScript but also refine your skills for your next JavaScript interview.
During the video, we'll pose a question for you to answer, followed by the correct response. We will give you 15 seconds to answer each question. Optionally, you can pause the video if you need more time.
Although we will be focusing on interview responses, it's important to be familiar with the technical aspect of each topic. You can find detailed technical responses, under the Functions category on our website, at HelloJavaScript.info.
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Questions:
00:00 Introduction
00:59 Can you name at least three types of functions in JavaScript?
01:30 What is a function declaration in JavaScript?
02:09 What is the definition of a JavaScript Function?
02:45 What is hoisting, and how does it affect function declarations?
03:20 What is the primary purpose of JavaScript functions?
03:55 Is there a limitation on variables declared inside a function?
04:31 Can functions access variables outside the function body?
05:09 What is a Global variable?
05:52 What is the Modern JavaScript rule for using Global Variables?
06:35 Can you explain how to use parameters in functions?
07:12 What occurs if a function parameter isn't supplied during invocation?
07:50 How is a default function parameter evaluated in JavaScript?
08:25 Is there a way to check for an omitted function parameter and return a new value?
09:03 Can you implement multiple occurrences of a return statement in a single function?
09:43 Why is it not recommended to use multiple return statements in JavaScript?
10:22 Is it possible to use a return statement without a value?
11:00 What does a return statement with an empty value output?
11:35 What is the most important thing to remember when using a return statement?
12:11 What are good naming practices for JavaScript functions?
12:53 What are the best practices for the creation of a function?
13:33 Should there be a separation of concerns in functions?
14:11 What is a callback function in JavaScript?
14:47 What is a higher-order function in JavaScript?
15:21 What is a closure in JavaScript?
15:59 What is a pure function in JavaScript?
16:37 What are the benefits of using pure functions in JavaScript?
17:15 What are Side-Effects in JavaScript functions?
17:49 Can a function declaration be called earlier than it is defined?
18:26 What is the scope of data in a function?
18:57 What is the purpose of the “this” keyword in JavaScript?
19:32 Conclusion: JavaScript Functions
