Arrays of objects ऑब्जेक्ट के ऐरे

1. A shopping cart

Real apps keep arrays of objects: each item in a cart is an object, and the cart is an array of them.

• cart[0].name is the first item’s name
• for (const item of cart) { ... } visits each object; inside, use item.price and item.qty

Wrap the work in a function that takes the cart as a parameter — then it works for any cart.

                const order = [
  { name: "Idli", price: 40, qty: 2 },
  { name: "Filter coffee", price: 25, qty: 1 },
];
for (const item of order) {
  console.log(`${item.name}: ₹${item.price * item.qty}`);
}
              

Challenge: Kirana cart total

Complete cartTotal(items) so it returns the sum of price × qty for every item. For the given cart it returns 1110, and for an empty cart [] it returns 0. Then print Cart total: ₹1110.

2. filter and map on objects

filter and map shine with arrays of objects. You can even chain them — the result of one goes into the next:

products.filter(p => p.stock > 0).map(p => p.name)

First keep the products in stock, then turn each product into just its name.

                const trains = [
  { name: "Rajdhani", late: 0 },
  { name: "Shatabdi", late: 15 },
];
console.log(trains.filter(t => t.late > 0).map(t => t.name)); // ["Shatabdi"]
              

Challenge: What can we sell today?

Write two functions that take a list of fruit objects:

• inStockNames(list) returns the names of fruits whose stock is more than 0
• priceTags(list) returns a tag for every fruit like Mango: ₹120