digital wallet.html

// Simple Digital Wallet Implementation

class Wallet {
  constructor() {
    this.users = {}; // Stores user accounts
  }

  // Create a new user account
  createAccount(username) {
    if (this.users[username]) {
      console.log(`Account for ${username} already exists.`);
      return;
    }
    this.users[username] = { balance: 0 };
    console.log(`Account created for ${username}.`);
  }

  // Deposit funds into a user's account
  deposit(username, amount) {
    if (!this.users[username]) {
      console.log(`Account for ${username} does not exist.`);
      return;
    }
    if (amount <= 0) {
      console.log(`Deposit amount must be positive.`);
      return;
    }
    this.users[username].balance += amount;
    console.log(`${amount} deposited to ${username}'s account. Current balance: ${this.users[username].balance}`);
  }

  // Withdraw funds from a user's account
  withdraw(username, amount) {
    if (!this.users[username]) {
      console.log(`Account for ${username} does not exist.`);
      return;
    }
    if (amount <= 0) {
      console.log(`Withdrawal amount must be positive.`);
      return;
    }
    if (this.users[username].balance < amount) {
      console.log(`Insufficient funds in ${username}'s account.`);
      return;
    }
    this.users[username].balance -= amount;
    console.log(`${amount} withdrawn from ${username}'s account. Current balance: ${this.users[username].balance}`);
  }

  // Transfer funds between two accounts
  transfer(sender, receiver, amount) {
    if (!this.users[sender]) {
      console.log(`Sender account for ${sender} does not exist.`);
      return;
    }
    if (!this.users[receiver]) {
      console.log(`Receiver account for ${receiver} does not exist.`);
      return;
    }
    if (amount <= 0) {
      console.log(`Transfer amount must be positive.`);
      return;
    }
    if (this.users[sender].balance < amount) {
      console.log(`Insufficient funds in ${sender}'s account.`);
      return;
    }
    this.users[sender].balance -= amount;
    this.users[receiver].balance += amount;
    console.log(`${amount} transferred from ${sender} to ${receiver}.`);
  }

  // Check the balance of a user's account
  checkBalance(username) {
    if (!this.users[username]) {
      console.log(`Account for ${username} does not exist.`);
      return;
    }
    console.log(`Current balance for ${username}: ${this.users[username].balance}`);
  }
}

// Example Usage
const myWallet = new Wallet();

myWallet.createAccount('Alice');
myWallet.createAccount('Bob');
myWallet.deposit('Alice', 100);
myWallet.checkBalance('Alice');
myWallet.withdraw('Alice', 50);
myWallet.checkBalance('Alice');
myWallet.transfer('Alice', 'Bob', 25);
myWallet.checkBalance('Alice');
myWallet.checkBalance('Bob');