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๐Ÿš€ JavaScript Interview Questions with Answers โ€” Part 2

11. What is the typeof operator?

The typeof operator is used to determine the data type of a value.

Example:

console.log(typeof "Hello");   // "string"
console.log(typeof 100); // "number"
console.log(typeof true); // "boolean"
console.log(typeof undefined); // "undefined"


Important Interview Point:

console.log(typeof null);


Output: "object"

This is a historical behavior in JavaScript.

12. What are template literals?

Template literals are strings created using backticks ``.

They allow you to easily embed variables and expressions using ${}.

Example:

const name = "Ajay";
const age = 25;

console.log(`My name is ${name} and I am ${age} years old.`);


Output: My name is Ajay and I am 25 years old.

Benefits:

Easy string interpolation

Supports multi-line strings

Allows expressions inside strings

13. What are JavaScript operators?

Operators are symbols used to perform operations on values.

Common Types:

Arithmetic: + - * / % **

Comparison: == === != !== > < >= <=

Logical: && || !

Assignment: = += -= *= /=

Example:

const a = 10;
const b = 5;
console.log(a + b); // 15
console.log(a > b); // true


14. What is the ternary operator?

The ternary operator is a short way of writing an if...else statement.

Syntax:

condition ? valueIfTrue : valueIfFalse;


Example:

const age = 20;
const result = age >= 18 ? "Adult" : "Minor";
console.log(result);


Output: Adult

Equivalent if...else:

if (age >= 18) {
result = "Adult";
} else {
result = "Minor";
}


Interview Tip: Use ternary operators for simple conditions. Avoid deeply nested ternaries because they reduce readability.

15. What is variable hoisting?

Hoisting is JavaScript's behavior of processing declarations before executing the code in their scope.

With var:

console.log(x);
var x = 10;


Output: undefined

The declaration is hoisted, but the assignment happens later.

With let and const:

console.log(x);
let x = 10;


This results in a ReferenceError.

let and const are hoisted but remain in the Temporal Dead Zone (TDZ) until their declaration is reached.

Function declarations are also hoisted:

greet();
function greet() {
console.log("Hello");
}


16. What is scope in JavaScript?

Scope determines where a variable can be accessed in a program.

Example:

function test() {
let message = "Hello";
console.log(message);
}
test();


message is accessible inside the function but not outside it.

Main Types:

Global Scope

Function Scope

Block Scope

Module Scope

Understanding scope is essential for closures and avoiding variable conflicts.

17. What are global, function, and block scope?

Global Scope

A variable declared outside functions or blocks can generally be accessed throughout the script.

let name = "Deepak";
function greet() {
console.log(name);
}


Function Scope

Variables declared with var inside a function are accessible throughout that function.


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12. Master Window Functions

Once your basics are strong, learn:

โ€ข ROW_NUMBER()

โ€ข RANK()

โ€ข DENSE_RANK()

โ€ข LAG()

โ€ข LEAD()

โ€ข SUM() OVER()

โ€ข AVG() OVER()

These are especially important for Data Analyst interviews.

13. Don't just memorize queries

Instead of memorizing: "This is the query to find the second-highest salary."

Understand the problem: "I need to rank salaries and identify the second position."

Then decide whether DENSE_RANK(), ROW_NUMBER(), a subquery, or another approach is appropriate.

14. Practice with business problems

Don't practice only: Find employees, Find salaries, Find departments

Practice realistic problems:

โ€ข Find customers who haven't purchased in 90 days

โ€ข Find the top 3 products in each category

โ€ข Calculate month-over-month sales growth

โ€ข Find duplicate transactions

โ€ข Identify customers whose spending increased

โ€ข Calculate employee retention

โ€ข Find the second-highest salary in each department

15. Learn to read execution plans later

Once you're comfortable with SQL, start learning:

โ€ข Indexes

โ€ข Query execution plans

โ€ข Table scans

โ€ข Index scans

โ€ข Query optimization

You don't need this on day one, but it's important as you progress.

๐Ÿ”ฅ Most important tip: Don't just watch SQL tutorials. Write SQL every day. Even 5โ€“10 problems daily will build your confidence much faster than passive learning.



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You have orders table with columns: order_id, customer_id, city, amount, status

Find each city's: Completed order count, Unique customers, Total revenue, Average order value. Only include cities where completed revenue is greater than โ‚น10,000. Sort by revenue from highest to lowest.

Solution:

SELECT
city,
COUNT(*) AS completed_orders,
COUNT(DISTINCT customer_id) AS unique_customers,
SUM(amount) AS revenue,
AVG(amount) AS average_order_value
FROM orders
WHERE status = 'Completed'
GROUP BY city
HAVING SUM(amount) > 10000
ORDER BY revenue DESC;



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