CODESAMPLE

Monolith - JavaScript

Monolith JavaScript

The Monolith pattern, in its simplest form, is an architectural style where an application is built as a single, unified unit. All components and functionalities are tightly coupled and deployed as one. This contrasts with microservices, which break down an application into independent services. This example demonstrates a basic JavaScript monolith structuring an e-commerce application with product listing, cart management, and checkout within a single file. It utilizes straightforward function calls and shared state (the cart array) to represent this tight coupling, typical of the pattern. This approach is common in smaller JavaScript applications or quick prototypes, prioritizing simplicity over scalability and maintainability.

// ecommerce-monolith.js

let products = [
  { id: 1, name: 'Laptop', price: 1200 },
  { id: 2, name: 'Mouse', price: 25 },
  { id: 3, name: 'Keyboard', price: 75 },
];

let cart = [];

function listProducts() {
  console.log('Available Products:');
  products.forEach(product => {
    console.log(`${product.name} - $${product.price}`);
  });
}

function addToCart(productId) {
  const product = products.find(p => p.id === productId);
  if (product) {
    cart.push(product);
    console.log(`${product.name} added to cart.`);
  } else {
    console.log('Product not found.');
  }
}

function viewCart() {
  if (cart.length === 0) {
    console.log('Cart is empty.');
    return;
  }

  console.log('Your Cart:');
  let total = 0;
  cart.forEach(item => {
    console.log(`${item.name} - $${item.price}`);
    total += item.price;
  });
  console.log(`Total: $${total}`);
}

function checkout() {
  if (cart.length === 0) {
    console.log('Cannot checkout - cart is empty.');
    return;
  }

  let total = cart.reduce((sum, item) => sum + item.price, 0);
  console.log(`Checkout complete. Total amount: $${total}`);
  cart = []; // Empty the cart after checkout
}

// Example Usage:
listProducts();
addToCart(1);
addToCart(2);
viewCart();
checkout();