digital_wallet1.js

// Digital Wallet Implementation

class DigitalWallet {
    constructor() {
        this.users = {};
    }

    // Create a new user
    createUser(username) {
        if (this.users[username]) {
            console.log("User already exists!");
            return;
        }
        this.users[username] = { balance: 0 };
        console.log(`User ${username} created successfully.`);
    }

    // Add money to a user's wallet
    addMoney(username, amount) {
        if (!this.users[username]) {
            console.log("User does not exist!");
            return;
        }
        if (amount <= 0) {
            console.log("Amount should be greater than zero.");
            return;
        }
        this.users[username].balance += amount;
        console.log(`₹${amount} added to ${username}'s wallet. Current balance: ₹${this.users[username].balance}`);
    }

    // Transfer money between users
    transferMoney(sender, receiver, amount) {
        if (!this.users[sender]) {
            console.log("Sender does not exist!");
            return;
        }
        if (!this.users[receiver]) {
            console.log("Receiver does not exist!");
            return;
        }
        if (amount <= 0) {
            console.log("Amount should be greater than zero.");
            return;
        }
        if (this.users[sender].balance < amount) {
            console.log("Insufficient balance in sender's wallet.");
            return;
        }

        this.users[sender].balance -= amount;
        this.users[receiver].balance += amount;
        console.log(`₹${amount} transferred from ${sender} to ${receiver}.`);
        console.log(`${sender}'s new balance: ₹${this.users[sender].balance}`);
        console.log(`${receiver}'s new balance: ₹${this.users[receiver].balance}`);
    }

    // Check user's wallet balance
    checkBalance(username) {
        if (!this.users[username]) {
            console.log("User does not exist!");
            return;
        }
        console.log(`${username}'s wallet balance: ₹${this.users[username].balance}`);
    }
}

// Example Usage
const wallet = new DigitalWallet();

// Create users
wallet.createUser("Alice");
wallet.createUser("Bob");

// Add money to wallet
wallet.addMoney("Alice", 1000);
wallet.addMoney("Bob", 500);

// Check balances
wallet.checkBalance("Alice");
wallet.checkBalance("Bob");

// Transfer money
wallet.transferMoney("Alice", "Bob", 200);

// Check balances again
wallet.checkBalance("Alice");
wallet.checkBalance("Bob");