Class OOP exercise JS

index.js

// const student = {
//   firstName: 'John',
//   lastName: 'Doe',
//   age: 25,
// };

// class Student {
//   constructor(firstName, lastName, age, teacherName) {
//     this.firstName = firstName;
//     this.lastName = lastName;
//     this.age = age;
//     this.teachers = [teacherName];
//   }

//   addTeacher(teacherName) {
//     this.teachers.push(teacherName);
//   }

//   findAllTeachers() {
//     return this.teachers;
//   }

//   getFullName() {
//     return `${this.firstName} ${this.lastName}`;
//   }
// }

// const student1 = new Student('John', 'Doe', 25, 'Peter Smith');
// const student2 = new Student('Jane', 'Doe', 23, 'Zack Smith');

// student1.addTeacher('Zack Smith');

// console.log(student1.teachers);

// console.log(student1.findAllTeachers());

// console.log(student1.getFullName());

// Design a bank account class
// balance, deposit, withdraw, getBalance

// @ts-nocheck

// class BankAccount {
//   constructor(balance) {
//     this.balance = balance;
//     this.history = [];
//   }

//   deposit(amount) {
//     this.balance += amount;
//     this.history.push(
//       `Deposit of $${amount}, remaining balance: $${this.balance}`,
//     );
//   }

//   withdraw(amount) {
//     this.balance -= amount;
//     this.history.push(
//       `Withdraw of $${amount}, remaining balance: $${this.balance}`,
//     );
//   }

//   getBalance() {
//     return this.balance;
//   }

//   getHistory() {
//     return this.history;
//   }
// }

// const account = new BankAccount(100);

// account.deposit(50);
// account.withdraw(10);
// console.log(account.getBalance());
// console.log(account.getHistory());

// Shopping cart, add item, remove item by title, get total
// every item: {name, price, quantity}
// Keep an items property in class

class ShoppingCart {
  constructor() {
    this.items = [];
  }

  addItem(item) {
    this.items.push(item);
  }

  removeItem(name) {
    const itemIndex = this.items.findIndex((item) => item.name === name);
    if (itemIndex > -1) {
      this.items.splice(itemIndex, 1);
    }
  }

  getItems() {
    return this.items.map((item) => {
      return {
        name: item.name,
        quantity: item.quantity,
      };
    });
  }

  getTotal() {
    return this.items.reduce(
      (acc, item) => acc + item.price * item.quantity,
      0,
    );
  }

  getReceipt() {
    return this.items
      .map((item) => {
        return `${item.name} * ${item.quantity}: $${
          item.price * item.quantity
        }`;
      })
      .join('\n');
  }

  clearCart() {
    this.items = [];
  }
}

// const cart = new ShoppingCart();
// cart.addItem({
//   name: 'Bread',
//   price: 1.99,
//   quantity: 2,
// });
// cart.addItem({
//   name: 'Milk',
//   price: 2.99,
//   quantity: 1,
// });
// cart.addItem({
//   name: 'Eggs',
//   price: 3.99,
//   quantity: 3,
// });

// console.log(cart.getTotal());
// cart.removeItem('Bread');

// console.log(cart.getTotal());
// console.log(cart.getItems());
// console.log(cart.getReceipt());

// Stock Exchange Account,
// properties
// - cash = int,
// - portfolio = { symbol, quantity, purchasePrice }
// methods
// - buyStock(symbol, quantity)
// - sellStock(symbol, quantity)
// - getPortfolioValue() - returns total value of portfolio
// - getPortfolio - returns list of stock symbols that you own.;

const stocks = {
  GOOG: {
    symbol: 'GOOG',
    price: 100,
  },
  AAPL: {
    symbol: 'AAPL',
    price: 200,
  },
  MSFT: {
    symbol: 'MSFT',
    price: 300,
  },
  FB: {
    symbol: 'FB',
    price: 400,
  },
};

class StockExchangeAccount {
  constructor(cash) {
    this.cash = cash;
    this.portfolio = [];
  }

  buyStock(symbol, quantity) {
    const stock = stocks[symbol];
    // const stock = Object.values(stocks).find((item) => item.symbol === symbol);
    if (stock) {
      const { symbol, price } = stock;
      const totalCost = price * quantity;
      if (this.cash >= totalCost) {
        const foundStockIndex = this.findStockIndex(symbol);
        if (foundStockIndex > -1) {
          this.portfolio[foundStockIndex].quantity += quantity;
        } else {
          this.portfolio.push({ symbol, quantity, purchasePrice: price });
        }
        this.cash -= totalCost;
      } else {
        console.log(
          'Sorry you do not have enough cash to create this transaction',
        );
      }
    } else {
      console.log('Did not find the stock you are looking for');
    }
  }

  sellStock(symbol, quantity) {
    const foundStockIndex = this.findStockIndex(symbol);
    const stock = this.portfolio[foundStockIndex];
    if (foundStockIndex > -1 && stock.quantity >= quantity) {
      stock.quantity -= quantity;
      if (stock.quantity === 0) {
        this.portfolio.splice(foundStockIndex, 1);
      }
      this.cash += quantity * stock.purchasePrice;
    }
  }

  findStockIndex(symbol) {
    return this.portfolio.findIndex((item) => item.symbol === symbol);
  }

  getPortfolioValue() {
    return this.portfolio.reduce(
      (acc, item) => acc + item.quantity * item.purchasePrice,
      0,
    );
  }

  getPortfolio() {
    return this.portfolio.map((item) => item.symbol);
  }
}