📘 JavaScript Homework 6 — Object Oriented Programming

This repository contains solutions for 3 tasks focused on Object-Oriented Programming (OOP) concepts in JavaScript. The homework covers this context, classes, private properties, class methods, and encapsulation. Each task is implemented in a separate file: task-1.js, task-2.js, task-3.js.

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🚀 Overview

After completing Module 6, you are almost at the core of JavaScript 💪 This homework reinforces your understanding of:

• The this keyword in different contexts
• this in global scope, object methods, arrow functions, and callbacks
• The call, apply, and bind methods
• Object-Oriented Programming fundamentals
• Classes, instances, and public interfaces
• Prototypes and prototypal inheritance
• Creating objects of the same type with shared behavior and different data

The final step is to correctly use this, build classes for managing data, and work with string constructors.

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🔹 Task 1: User Account (task-1.js)

Refactor an existing object to correctly use the this keyword. The task simulates a real-world scenario where a developer left broken code for managing user accounts in a food delivery service.

You must fix object methods so they properly access and update object properties using this.

const customer = {
  username: "Mango",
  balance: 24000,
  discount: 0.1,
  orders: ["Burger", "Pizza", "Salad"],
};

✅ What was practiced:

• Correct usage of this inside object methods
• Updating object state via methods
• Working with arrays and numeric calculations inside an object

✅ Expected behavior:

• Getting and updating balance and discount
• Adding new orders
• Returning updated orders list

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🔹 Task 2: Storage (task-2.js)

Create a Storage class to manage a warehouse inventory. The class stores items in a private property and provides a clean public interface for interaction.

Defined methods:

• getItems() — returns the current list of items
• addItem(newItem) — adds a new item to storage
• removeItem(itemToRemove) — removes an item by name

const storage = new Storage(["Nanitoids", "Prolonger", "Antigravitator"]);
console.log(storage.getItems());
storage.addItem("Droid");
storage.removeItem("Prolonger");

✅ What was practiced:

• Creating classes with constructors
• Using private class fields
• Encapsulation and controlled access to data
• Modifying internal state through class methods

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🔹 Task 3: String Builder (task-3.js)

Create a StringBuilder class for flexible string manipulation. The class stores a string in a private property and provides methods to modify it from different sides.

Defined methods:

• getValue() — returns the current string value
• padStart(str) — adds a string to the beginning
• padEnd(str) — adds a string to the end
• padBoth(str) — adds a string to both beginning and end

const builder = new StringBuilder(".");
builder.padStart("^");
builder.padEnd("^");
builder.padBoth("=");

✅ What was practiced:

• Working with private class fields
• String manipulation inside class methods
• Designing a clear and minimal public API

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📌 Summary & Reflection

With this homework, you practiced core Object-Oriented Programming concepts in JavaScript:

• Proper usage of this
• Building reusable classes
• Encapsulation with private properties
• Clean and predictable class interfaces
• Real-world scenarios using objects and classes

These tasks strengthen your understanding of OOP and prepare you for building scalable, maintainable JavaScript applications 🚀