Exercise 1: Word Frequency Counter: Write a function that takes a sentence as input and returns an object where keys are unique words and values are their frequencies in the sentence.

Exercise 2: Shopping Cart: Create a shopping cart program that allows users to add and remove items, and calculates the total price.

Exercise 3: Library Catalog: Design a library catalog system using objects that allows users to search for and borrow books.

Exercise 4: Contact List: Build a contact list manager where users can add, edit, and remove contacts.

Exercise 5: Quiz App: Develop a quiz application that tracks questions, answers, and scores using objects.

Exercise 6: Task Tracker: Design a task tracking system that allows users to create, update, and mark tasks as completed.

Exercise 7: Calendar Scheduler: Create a simple calendar app that lets users add events to specific dates using objects.

Exercise 8: Social Media Profile: Build a social media profile system that stores user information and tracks friend connections.

Exercise 9: Student Management System: Develop a student management system that stores student information, grades, and attendance.

Exercise 10: Recipe Book: Design a recipe book application where users can store and search for recipes.

Exercise 11: Game Character Inventory: Create a game character inventory system that tracks items, equipment, and stats.

Exercise 12: Weather Data Logger: Build a weather data logger that collects and stores weather information for different locations.

Exercise 13: Online Store Checkout: Develop an online store checkout system that calculates the total cost of items and handles discounts.

Exercise 14: Music Playlist Manager: Design a music playlist manager that allows users to create and organize playlists.

Exercise 15: Language Flashcards: Create a flashcard app for language learning, storing words and their translations.

Exercise 16: Task Priority Manager: Build a task priority manager that sorts tasks based on their priority levels.

Exercise 17: Expense Tracker: Develop an expense tracker that records and categorizes expenses for budgeting.

Exercise 18: Fitness Tracker: Design a fitness tracking app that monitors and displays user workout progress.

Exercise 19: Contactless Payment System: Create a contactless payment system that stores card information and processes transactions.

Exercise 20: Employee Performance Evaluation: Build an employee performance evaluation system that tracks performance metrics and generates reports.