JavaScript Operators Assignment: 60+ Real-Life Practice Questions

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Learning JavaScript operators becomes much easier when you practice them with real-world programming problems instead of solving only simple mathematical examples.

In this JavaScript Operators Assignment, you will solve more than 60 practical programming problems based on shopping bills, salary calculations, banking, loan eligibility, electricity bills, cab fares, student results, QA automation reports, and other real-life scenarios.

The exercises cover Arithmetic, Assignment, Comparison, Logical, Unary, Ternary, Optional Chaining, Nullish Coalescing, in, and instanceof operators.

Recommended for: JavaScript beginners, automation testers, QA engineers, SDET candidates, and students preparing for JavaScript or Playwright interviews.

What You Will Practice

  • Arithmetic Operators
  • Assignment Operators
  • Comparison Operators
  • Logical Operators
  • Unary Operators
  • Ternary Operator
  • Optional Chaining Operator
  • Nullish Coalescing Operator
  • in Operator
  • instanceof Operator
  • Combination of multiple JavaScript operators
  • Formula-based JavaScript programs
  • Real-world business calculations

Prerequisites

Before attempting these exercises, you should understand JavaScript variables, data types, basic expressions, and console.log().

You should also be familiar with the basic JavaScript operators explained in the JavaScript Operators tutorial.

1. Arithmetic Operators – Assignment Questions

Arithmetic operators are commonly used for calculations. The main operators include +, -, *, /, %, and **.

Assignment 1: E-Commerce Shopping Bill

An online shopping website has the following products:

1 Laptop = ₹55,000
1 Mouse = ₹750
1 Keyboard = ₹1,500

A customer purchases:

1 Laptop
2 Mouse
1 Keyboard

Write a JavaScript program to calculate the total shopping amount.

Formula:

Total =
(Laptop Price × Quantity)
+ (Mouse Price × Quantity)
+ (Keyboard Price × Quantity)

Assignment 2: Restaurant Bill Split

Four friends visit a restaurant and the total bill is ₹3,850.

Calculate how much each person should pay if the bill is divided equally.

Formula:

Amount Per Person = Total Bill / Number of People

Assignment 3: Employee Net Salary

An employee has:

Basic Salary = ₹40,000
HRA = ₹8,000
Bonus = ₹5,000
Tax = ₹4,500

Calculate the gross salary and net salary.

Formula:

Gross Salary = Basic Salary + HRA + Bonus

Net Salary = Gross Salary - Tax

Assignment 4: Simple Interest Calculator

Create a program using:

Principal = ₹100,000
Rate = 8%
Time = 3 years

Calculate simple interest and total amount.

Formula:

SI = (Principal × Rate × Time) / 100

Total Amount = Principal + SI

Assignment 5: Compound Interest Calculator

Calculate compound interest for:

Principal = ₹50,000
Rate = 10%
Time = 2 years

Use the exponentiation operator **.

Formula:

Amount = Principal × (1 + Rate / 100) ** Time

Compound Interest = Amount - Principal

Assignment 6: Celsius to Fahrenheit

A weather application receives temperature in Celsius.

Celsius = 35

Convert it into Fahrenheit.

Formula:

Fahrenheit = (Celsius × 9 / 5) + 32

Assignment 7: BMI Calculator

A person’s weight is 72 kg and height is 1.75 meters.

Calculate BMI.

Formula:

BMI = Weight / Height²

Use the ** operator to calculate the square of the height.

Assignment 8: Rectangle Area and Perimeter

Create a program for:

Length = 15
Width = 8

Calculate:

Area = Length × Width

Perimeter = 2 × (Length + Width)

Assignment 9: Student Group Calculation

A teacher has 53 students and wants to create groups of 5 students.

Calculate:

  • Number of complete groups
  • Number of remaining students

Use both / and %.

Assignment 10: Convert Minutes into Hours

A training video has a duration of 367 minutes.

Convert the duration into hours and remaining minutes.

Expected format:

6 Hours 7 Minutes

Use division and modulus operators.

2. Assignment Operators – Assignment Questions

Assignment operators are useful when a variable needs to be updated based on its existing value.

Assignment 11: Bank Account Transactions

A customer’s bank balance is ₹50,000.

Perform these transactions:

Salary credited = ₹25,000
Electricity Bill = ₹3,500
Shopping = ₹7,000

Use += and -= to update the balance.

Assignment 12: Shopping Cart Update

The shopping cart initially contains products worth ₹2,000.

Add:

Shoes = ₹3,500
Shirt = ₹1,200

Then remove an item worth ₹800.

Use assignment operators to calculate the final cart value.

Assignment 13: Product Price Increase

A laptop costs ₹50,000. The manufacturer increases the price by 10%.

Update the price using an assignment operator.

Hint:

price += price * 10 / 100;

Assignment 14: Employee Salary Hike

An employee earns ₹60,000 per month. The company gives a 15% salary hike.

Update the salary using an assignment operator.

Assignment 15: Game Score Calculator

A player starts with a score of 100.

Perform the following:

Enemy defeated → +50
Bonus collected → +100
Penalty → -30
Score doubled → ×2

Use +=, -=, and *=.

3. Comparison Operators – Assignment Questions

Comparison operators return Boolean values such as true or false. They are commonly used in validation and decision-making logic.

Assignment 16: Voting Eligibility

A person is 20 years old.

Check whether the person is eligible to vote.

Condition:

Age >= 18

Assignment 17: Exam Passing Status

A student scores 39 marks and the passing marks are 40.

Determine whether the student has passed.

Assignment 18: Free Delivery Eligibility

An e-commerce website provides free delivery for orders of ₹999 or more.

Create an order amount and check whether the customer qualifies for free delivery.

Assignment 19: Loose vs Strict Equality

Consider:

let otpFromServer = 123456;
let otpFromUser = "123456";

Compare the values using both:

==
===

Observe the result and explain why the two operators behave differently.

Assignment 20: Product Stock Validation

A store has 10 units of a product, but the customer requests 12 units.

Determine whether sufficient stock is available.

Use:

Requested Quantity <= Available Quantity

Assignment 21: Speed Limit Checker

A car is travelling at 85 km/h on a road where the speed limit is 80 km/h.

Write a program to determine whether the driver has exceeded the speed limit.

4. Logical Operators – Assignment Questions

Logical operators such as &&, ||, and ! are used to combine or reverse conditions.

Assignment 22: Bank Loan Eligibility

A bank approves a loan when:

Age >= 21
AND
Monthly Salary >= ₹25,000
AND
Credit Score >= 700

Use the && operator to determine eligibility.

Assignment 23: Login Validation

A user should be allowed to log in only when both the username and password are correct.

Username = "admin"
Password = "admin123"

Use &&.

Assignment 24: Discount Eligibility

A shopping website gives a discount when either:

  • The customer is a Premium Member.
  • The order amount is ₹5,000 or more.

Use the || operator.

Assignment 25: Job Eligibility

A company requires:

Experience >= 3 years
JavaScript Skill = true
Automation Skill = true

Determine whether the candidate is eligible.

Assignment 26: Movie Ticket Eligibility

A person can watch a movie when either:

  • Age is 18 or above.
  • Parent permission is available.

Use the || operator.

Assignment 27: Account Status

Given:

let accountBlocked = false;

Use the ! operator to determine whether the account is active.

5. Unary Operators – Assignment Questions

Unary operators work with a single operand. Common examples include ++, --, typeof, and !.

Assignment 28: Website Visitor Counter

A website currently has 1,000 visitors.

When a new visitor opens the website, increase the count using ++.

Assignment 29: Inventory Counter

A store has 50 units of a product.

A customer purchases one item. Reduce the stock using --.

Assignment 30: Cricket Score Counter

A batsman has scored 49 runs and scores one additional run.

Use ++ to update the score.

Assignment 31: Identify JavaScript Data Types

Create variables for:

name = "Rahul"
age = 25
isEmployee = true
salary = undefined

Use typeof to determine the data type of each variable.

Assignment 32: Login Status Reversal

Given:

let isLoggedIn = false;

Use ! to reverse the login status.

6. Ternary Operator – Assignment Questions

The ternary operator provides a concise way to write simple conditional expressions.

Syntax:

condition ? value1 : value2;

Assignment 33: Student Pass or Fail

A student scores 65 marks.

Display Pass when marks are 40 or above; otherwise display Fail.

Use the ternary operator.

Assignment 34: Adult or Minor

A person’s age is 17.

Use the ternary operator to display either Adult or Minor.

Assignment 35: Free Delivery

An online order is worth ₹1,200.

Display:

Free Delivery

when the order amount is at least ₹999; otherwise display:

Delivery Charge ₹100

Assignment 36: Even or Odd

Given:

let number = 27;

Use the modulus operator together with the ternary operator to determine whether the number is even or odd.

Assignment 37: Maximum of Two Numbers

Given:

Number1 = 45
Number2 = 78

Use the ternary operator to determine the larger number.

Assignment 38: Employee Bonus

An employee receives a ₹10,000 bonus when years of service are 5 or more. Otherwise, the employee receives ₹5,000.

Calculate the bonus using the ternary operator.

7. Optional Chaining Operator ?.

Optional chaining is useful when working with objects or API responses where a property may not exist.

Assignment 39: Customer Address

let customer = {
    name: "Rahul",
    address: {
        city: "Bhopal"
    }
};

Safely retrieve:

customer.address.city
customer.address.pincode

Use optional chaining so that the program does not throw an error when the property does not exist.

Assignment 40: API Response Validation

let response = {
    user: {
        profile: {
            name: "Amit"
        }
    }
};

Safely access:

response.user.profile.name
response.user.profile.mobile
response.user.address.city

Use ?..

8. Nullish Coalescing Operator ??

The nullish coalescing operator can be used to provide a default value when a variable is null or undefined.

Assignment 41: Default Username

let username = null;

Display Guest User when the username is null or undefined.

Use ??.

Assignment 42: Default Product Discount

An API returns:

let discount = null;

If the discount is unavailable, use 0 as the default value.

Assignment 43: Employee Salary

let employee = {
    name: "John"
};

Safely retrieve the employee’s salary.

If the salary is unavailable, display:

Salary Not Available

Combine ?. and ??.

9. in Operator – Assignment Questions

The in operator is useful when checking whether a property exists in an object.

Assignment 44: User Profile Validation

let user = {
    name: "Rahul",
    email: "rahul@gmail.com"
};

Check whether the following properties exist:

name
email
mobile

Use the in operator.

Assignment 45: Product Information Validation

let product = {
    id: 101,
    name: "Laptop",
    price: 55000
};

Check whether the following properties exist:

price
discount
stock

10. instanceof Operator – Assignment Questions

Assignment 46: Employee Object Validation

Create an Employee class:

class Employee {
    constructor(name) {
        this.name = name;
    }
}

Create an employee object and use instanceof to verify that the object belongs to the Employee class.

Assignment 47: Array Validation

Create:

let products = ["Laptop", "Mouse", "Keyboard"];

Use instanceof to determine whether products is an instance of Array.

11. Mixed JavaScript Operator Challenges

The following problems are designed to simulate real application scenarios. You will need to combine multiple JavaScript operators.

Assignment 48: E-Commerce Final Bill Calculator

A customer purchases:

Laptop = ₹50,000
Mouse = ₹1,000
Keyboard = ₹2,000

Discount rules:

Purchase >= ₹50,000 → 10% discount
Otherwise → 5% discount

GST is 18%.

Calculate:

  • Subtotal
  • Discount
  • Amount after discount
  • GST
  • Final amount

Formulas:

Subtotal = Laptop + Mouse + Keyboard

Discount = Subtotal × DiscountPercentage / 100

AmountAfterDiscount = Subtotal - Discount

GST = AmountAfterDiscount × 18 / 100

FinalAmount = AmountAfterDiscount + GST

Assignment 49: Employee Monthly Salary Calculator

Employee details:

Basic Salary = ₹50,000
HRA = 20%
DA = 10%
PF = 12%
Tax = 5%

Calculate HRA, DA, gross salary, PF deduction, tax deduction, and net salary.

Formulas:

HRA = Basic × 20 / 100
DA = Basic × 10 / 100
Gross = Basic + HRA + DA
PF = Basic × 12 / 100
Tax = Gross × 5 / 100
Net Salary = Gross - PF - Tax

Assignment 50: Electricity Bill Calculator

A customer consumes 350 units.

Billing rules:

First 100 units → ₹5/unit
Next 200 units → ₹7/unit
Above 300 units → ₹10/unit

Calculate the final electricity bill.

Challenge: Calculate the bill slab by slab rather than multiplying all units by ₹10.

Assignment 51: Cab Fare Calculator

A cab company charges:

Base Fare = ₹50
Per KM Charge = ₹12
Distance = 25 KM

If the distance exceeds 20 KM, add a long-distance charge of ₹100.

Calculate the final fare.

Formula:

Fare = Base Fare + Distance × PerKM

Assignment 52: EMI Calculator

Calculate the approximate monthly EMI for:

Loan Amount = ₹500,000
Annual Interest Rate = 10%
Loan Duration = 5 Years

Use:

Monthly Rate = Annual Rate / 12 / 100

Number of Payments = Years × 12

EMI =
P × R × (1 + R)^N
-----------------
(1 + R)^N - 1

Where P is the principal, R is the monthly interest rate, and N is the number of monthly payments.

Assignment 53: Student Result Calculator

A student has the following marks:

Math = 78
Science = 82
English = 69
Computer = 91
Hindi = 74

Calculate:

  • Total marks
  • Percentage
  • Pass/Fail status
  • Grade

Grade rules:

Percentage >= 90 → A+
Percentage >= 80 → A
Percentage >= 70 → B
Percentage >= 60 → C
Percentage >= 40 → D
Below 40 → Fail

The student must also fail if any individual subject mark is below 40.

Assignment 54: Online Shopping Checkout

Customer details:

Cart Amount = ₹4,500
Premium Member = true
Coupon Available = true

Rules:

  • Premium Member → 10% discount
  • Coupon Available → Additional ₹500 discount
  • Orders of ₹3,000 or more → Free delivery
  • Otherwise → ₹100 delivery charge

Calculate the final payable amount.

Use arithmetic, comparison, logical, ternary, and assignment operators.

Assignment 55: Bank Loan EMI Eligibility

Customer details:

Age = 30
Monthly Salary = ₹60,000
Existing EMI = ₹10,000
Credit Score = 750
Requested EMI = ₹18,000

Eligibility rules:

Age >= 21 AND Age <= 60

Credit Score >= 700

Total EMI <= 50% of Monthly Salary

Calculate:

Total EMI = Existing EMI + Requested EMI

Maximum Allowed EMI = Salary × 50 / 100

Display Loan Approved or Loan Rejected.

12. Bonus JavaScript Operator Challenges

Assignment 56: Food Delivery Order Calculator

Create a food delivery billing program with:

Food Amount = ₹850
Delivery Distance = 7 KM
Premium Member = false
Coupon Discount = ₹100

Rules:

  • Food Amount of ₹500 or more → 5% discount
  • Premium Member → Free delivery
  • Non-premium and distance <= 5 KM → ₹40 delivery
  • Non-premium and distance > 5 KM → ₹80 delivery
  • GST = 5%

Calculate the final payable amount.

Assignment 57: Fuel Cost Calculator

A car travels 650 KM.

Distance = 650 KM
Mileage = 18 KM/L
Petrol Price = ₹105/L

Calculate:

Fuel Required = Distance / Mileage

Fuel Cost = Fuel Required × Petrol Price

If the fuel cost exceeds ₹3,000, calculate the amount exceeding the budget.

Assignment 58: Profit Percentage Calculator

A shopkeeper purchases a laptop for ₹45,000 and sells it for ₹52,000.

Calculate:

Profit = Selling Price - Cost Price

Profit Percentage =
Profit / Cost Price × 100

Finally determine whether the transaction resulted in profit or loss.

Assignment 59: Attendance Calculator

A student has:

Total Classes = 120
Classes Attended = 92

Calculate:

Attendance Percentage =
Classes Attended / Total Classes × 100

The student is eligible for the examination only when attendance is at least 75%.

Assignment 60: QA Automation Test Report

An automation test suite contains:

Total Tests = 250
Passed = 210
Failed = 25
Skipped = 15

Calculate:

  • Pass Percentage
  • Failure Percentage
  • Skipped Percentage

Formula:

Percentage = Count / Total Tests × 100

The build is considered PASSED when:

Pass Percentage >= 90
AND
Failed Tests <= 10

Otherwise, display FAILED.

13. Final Mini Project – Employee Payroll System

This is the final challenge. Build a complete employee payroll calculator using multiple JavaScript operators.

Employee Information

Employee Name = "Rahul"
Basic Salary = ₹60,000
Performance Rating = 4.5
Years of Service = 6

Salary Components

HRA = 20% of Basic Salary
DA = 10% of Basic Salary
PF = 12% of Basic Salary

Performance Bonus Rules

Rating >= 4.5 → 15% Bonus
Rating >= 4.0 → 10% Bonus
Rating >= 3.0 → 5% Bonus
Otherwise → No Bonus

Loyalty Bonus

If years of service are 5 or more, the employee receives a ₹10,000 loyalty bonus.

Calculate

  • HRA
  • DA
  • Performance Bonus
  • Loyalty Bonus
  • Gross Salary
  • PF
  • Net Salary

Expected Output Format

Employee: Rahul
Basic Salary: ₹60000
HRA: ₹____
DA: ₹____
Performance Bonus: ₹____
Loyalty Bonus: ₹____
Gross Salary: ₹____
PF Deduction: ₹____
Net Salary: ₹____

How to Solve These JavaScript Assignments

Follow these steps for every problem:

  1. Read the problem carefully.
  2. Identify the input values.
  3. Identify the required output.
  4. Write the mathematical formula if applicable.
  5. Identify which JavaScript operators are required.
  6. Create meaningful variables.
  7. Implement the calculation or condition.
  8. Display the result using console.log().
  9. Test the program with different input values.

Assignment Rules for Students

  1. Use meaningful variable names.
  2. Do not hardcode calculated results.
  3. Use the operator relevant to each assignment.
  4. Display intermediate calculations where appropriate.
  5. Add comments explaining important formulas.
  6. For challenge programs, combine multiple operator types.
  7. Test each program with at least two different sets of input values.
  8. Use console.log() to clearly display the final output.
  9. For formula-based problems, write the formula as a comment before implementing it.
  10. Try to solve the problem independently before looking at a solution.

JavaScript Operators Assignment – Learning Outcome

After completing these assignments, you should be comfortable using JavaScript operators to solve practical programming problems involving calculations, validation, decision-making, object handling, and business logic.

These exercises are particularly useful for students preparing for JavaScript interviews, QA automation, SDET interviews, Selenium JavaScript automation, and Playwright with TypeScript.

Frequently Asked Questions

What are JavaScript operators?

JavaScript operators are symbols or keywords used to perform operations on values and variables. They are commonly used for calculations, comparisons, assignments, logical conditions, and object-related operations.

What are the main types of JavaScript operators?

The commonly used categories include arithmetic, assignment, comparison, logical, unary, ternary, and special operators such as optional chaining, nullish coalescing, in, and instanceof.

Which JavaScript operators should beginners learn first?

Beginners should first learn arithmetic, assignment, comparison, logical, and ternary operators. Once these are comfortable, they can move to unary and modern operators such as ?. and ??.

Why should JavaScript operators be practiced using real-life problems?

Real-life problems help students understand how operators are used in applications such as shopping carts, banking systems, payroll applications, billing systems, login validation, and test automation reports.

Are these JavaScript operator exercises suitable for interviews?

Yes. These exercises are useful for building the calculation and logical reasoning skills commonly tested in JavaScript and automation interviews.

Conclusion

Practicing JavaScript operators through real-world scenarios is one of the best ways to strengthen JavaScript fundamentals. Instead of memorizing operator definitions, solve problems involving shopping bills, salaries, banking, loans, electricity bills, student results, and automation reports.

Start with the basic arithmetic assignments and gradually move toward the mixed operator challenges and the final employee payroll project.

Tip: Do not immediately look for the solution. First identify the required formula, select the appropriate operators, write the logic yourself, and then test your program with different inputs.

Next Step: After completing these assignments, practice JavaScript Arrays, JavaScript Functions, objects, loops, and scenario-based JavaScript programs to build stronger programming skills.

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