Learn encapsulation, inheritance, polymorphism, and abstraction. These principles organize code into reusable, maintainable classes.

• Encapsulation
• Inheritance
• Polymorphism
• Abstraction

class BankAccount {
  #balance = 0;
  
  deposit(amount) { this.#balance += amount; }
  withdraw(amount) { if (amount <= this.#balance) this.#balance -= amount; }
  getBalance() { return this.#balance; }
// ...

• Encapsulation works

• Private fields with # prevent external access
• Inheritance: class Child extends Parent
• Polymorphism: override parent methods in child classes

Learn encapsulation, inheritance, polymorphism, and abstraction. These principles organize code into reusable, maintainable classes.

• Encapsulation
• Inheritance
• Polymorphism
• Abstraction

class BankAccount {
  #balance = 0;
  
  deposit(amount) { this.#balance += amount; }
  withdraw(amount) { if (amount <= this.#balance) this.#balance -= amount; }
  getBalance() { return this.#balance; }
// ...

• Encapsulation works

• Private fields with # prevent external access
• Inheritance: class Child extends Parent
• Polymorphism: override parent methods in child classes