Front end Interview Questions & Answers

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• Javascript Questions

Table of Contents

• Coding Questions

No.	Questions
1	What is JavaScript?
2	What are JavaScript Data Types?
3	What are the possible ways to create objects in JavaScript ?
4	What is the difference between == and === operators ?
5	What is a first class function ?
6	What is a higher order function ?
7	What is the purpose of the let keyword ?
8	What is the difference between let and var ?
9	What is the reason to choose the name let as a keyword ?
10	How do you redeclare variables in switch block without an error ?
11	What is IIFE(Immediately Invoked Function Expression) ?
12	What is Hoisting ?
13	What are closures?
14	What are modules ?
15	Why do you need modules ?
16	What is scope in javascript ?
17	Why do you need strict mode ?
18	How do you declare strict mode ?
19	What is the typeof operator ?
20	What is undefined property ?
21	What is undefined property ?
22	What is null value ?
23	What is the difference between null and undefined ?
24	What is isNaN ?
25	What are the differences between undeclared and undefined variables ?