Thread by @swapnakpanda

JavaScript Interview Questions

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Series: 1️⃣
Level: Beginner
Topics:

➊ Data Types
➋ Boolean
➌ Number
➍ Logical Operators
➎ Comparison Operators
➏ Arithmetic Operators

🚥 Disclaimer

⬖ The questions covered here are mostly conceptual
⬘ I never claim only these type of questions are/should be asked during interviews
⬗ For interviews, you should have fundamentals strong. And you should be able to provide solutions to practical problems.

➊ Data Types

➀ What all data types does JavaScript provide?
➁ How to find out data type of a value? (which operator to use)
➂ What is type coercion?
➃ Any significant difference between "undefined" and "null"?
➄ What is the type of undefined?
➅ What is the type of null?

➋ Boolean

➀ What boolean literals does JavaScript provide?
➁ What all in JavaScript are falsy?
➂ What are different ways to convert any value to a boolean?

➌ Number

➀ How does JavaScript store numbers in memory?
➁ What are different ways to convert a value to a number?
➂ Which all base of numbers JavaScript support?
➃ How to write binary numbers?
➄ How to write octal numbers?
➅ How to write hexadecimal numbers?

➆ How to convert a decimal into binary / octal / hexadecimal?
➇ How to convert a binary / octal / hexadecimal into decimal?
➈ How does parseInt function operate?
➉ What is a numeric separator? Why is it used?

➀➀ What is NaN?
➀➁ Which operations may result into NaN?
➀➂ How to check if a value is NaN?
➀➃ What does NaN === NaN return?

➍ Comparison Operators

➀ What all comparison operators JS has?
➁ What is the data type of result of comparison operators?
➂ How does an equality operator behave?
➃ What is a strict equality operator?
➄ What is the difference between == and ===?

➎ Logical Operators

➀ Why are && and || operators called short-circuit?
➁ Which operator can be used to convert a value of any data type to a boolean?
➂ Which values are Nullish?
➃ Which operator can be used to detect Nullish values?
➄ Difference between || and ??

➏ Arithmetic Operators

➀ How to find out if a binary + operator is meant for arithmetic addition or, string concatenation?
➁ What is the result when something is divided by Zero?
➂ Which operator can be used to convert a value of any data type to a number?

➃ Which arithmetic operations may result into Infinity or, -Infinity?
➄ What is the precedence of arithmetic operators?

⚠️ Repost Notice ⚠️

⬖ This is my original work. But, it was previously posted in [CHIRPBIRDICON]

⬘ Many questions have been taken from the original 🧵

⬙ If you liked these questions and do feel others might learn from it, please support.

End of 🧵

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