JavaScript Object Programs (Without Solution)

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The following exercises are designed for developers who already understand JavaScript objects and want to practice solving real-world problems. Each program includes a scenario, input, expected output, and requirements without providing the solution.

1. Find the Employee with the Highest Salary

Scenario

A company stores employee details in an object. Find the employee who has the highest salary.

Input

const employees = {
    emp1: { name: "John", salary: 55000 },
    emp2: { name: "Alice", salary: 72000 },
    emp3: { name: "David", salary: 68000 }
};

Expected Output

Highest Salary Employee:
Alice
Salary: 72000

2. Count Product Categories

Scenario

An online shopping website stores products with categories. Count how many products belong to each category.

Input

const products = {
    p1: { category: "Electronics" },
    p2: { category: "Furniture" },
    p3: { category: "Electronics" },
    p4: { category: "Books" },
    p5: { category: "Books" }
};

Expected Output

Electronics : 2
Furniture : 1
Books : 2

3. Merge Student Information

Scenario

Merge two student objects into one object.

Input

const personal = {
    name: "Rahul",
    age: 21
};

const academic = {
    course: "B.Tech",
    marks: 88
};

Expected Output

{
    name: "Rahul",
    age: 21,
    course: "B.Tech",
    marks: 88
}

4. Find Missing Properties

Scenario

Check whether every employee object contains an email property.

Input

const employees = {
    emp1: {
        name: "John",
        email: "john@test.com"
    },
    emp2: {
        name: "Alice"
    },
    emp3: {
        name: "David",
        email: "david@test.com"
    }
};

Expected Output

Employee Missing Email:
Alice

5. Calculate Total Shopping Cart Value

Scenario

Calculate the total bill of all products in the shopping cart.

Input

const cart = {
    item1: {
        name: "Mouse",
        price: 700,
        quantity: 2
    },
    item2: {
        name: "Keyboard",
        price: 1200,
        quantity: 1
    },
    item3: {
        name: "Monitor",
        price: 9500,
        quantity: 1
    }
};

Expected Output

Total Cart Value:
12100

6. Remove Null Values from Object

Scenario

Remove all properties whose value is null.

Input

const user = {
    name: "Deepesh",
    phone: null,
    city: "Bhopal",
    email: null,
    age: 30
};

Expected Output

{
    name: "Deepesh",
    city: "Bhopal",
    age: 30
}

7. Find Duplicate Values

Scenario

Identify duplicate values present in an object.

Input

const students = {
    s1: "A",
    s2: "B",
    s3: "A",
    s4: "C",
    s5: "B"
};

Expected Output

Duplicate Values:
A
B

8. Convert Object into Sorted Array

Scenario

Convert the object values into an array and sort them in ascending order.

Input

const marks = {
    maths: 78,
    science: 91,
    english: 65,
    computer: 99
};

Expected Output

[65, 78, 91, 99]

9. Update Nested Object

Scenario

Update the city of the employee.

Input

const employee = {
    id: 101,
    name: "John",
    address: {
        city: "Delhi",
        state: "Delhi"
    }
};

Task

Update city to Mumbai.

Expected Output

{
    id:101,
    name:"John",
    address:{
        city:"Mumbai",
        state:"Delhi"
    }
}

10. Find Average Salary

Scenario

Calculate the average salary of all employees.

Input

const employees = {
    emp1: { salary: 45000 },
    emp2: { salary: 60000 },
    emp3: { salary: 75000 },
    emp4: { salary: 50000 }
};

Expected Output

Average Salary:
57500

11. Inventory Stock Checker

Scenario

Display all products whose quantity is less than 5.

Input

const inventory = {
    p1: { name: "Laptop", quantity: 3 },
    p2: { name: "Keyboard", quantity: 8 },
    p3: { name: "Mouse", quantity: 2 },
    p4: { name: "Monitor", quantity: 10 }
};

Expected Output

Low Stock Products:
Laptop
Mouse

12. Group Employees by Department

Scenario

Group employees based on department.

Input

const employees = {
    emp1: { name: "John", department: "IT" },
    emp2: { name: "Alice", department: "HR" },
    emp3: { name: "David", department: "IT" },
    emp4: { name: "Emma", department: "Finance" }
};

Expected Output

{
    IT: ["John", "David"],
    HR: ["Alice"],
    Finance: ["Emma"]
}

13. Find the Most Expensive Product

Scenario

Find the product with the highest price.

Input

const products = {
    p1: { name: "Phone", price: 25000 },
    p2: { name: "Laptop", price: 65000 },
    p3: { name: "Watch", price: 12000 }
};

Expected Output

Laptop
65000

14. Count Boolean Values

Scenario

Count how many properties have true and false values.

Input

const permissions = {
    read: true,
    write: false,
    delete: true,
    update: false,
    share: true
};

Expected Output

True : 3
False : 2

15. Reverse Key-Value Pairs

Scenario

Swap the keys and values of an object.

Input

const countryCodes = {
    India: "IN",
    America: "US",
    Japan: "JP"
};

Expected Output

{
    IN: "India",
    US: "America",
    JP: "Japan"
}

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