Another 2 Examples of an object, an array and a loop. In the 1st example we have an object that can be looped through in order to calculate the total of a shopping cart, taking in account any discounts that may apply, and then outputting the result to the console.
The 2nd example takes the same object and stores the items whose total price (item price x item quantity) is between 2 and 5.

JavaScript Code

     //Example 1
    const shoppingCart = [
    { name: "loaf of bread", type: "food", quantity: 1, price: 0.85 },
    { name: "multipack beans", type: "food", quantity: 1, price: 1 },
    { name: "mushrooms", type: "food", quantity: 10, price: 0.1 },
    { name: "can of beer", type: "alcohol", quantity: 4, price: 1.1 },
    { name: "prosecco", type: "alcohol", quantity: 1, price: 8.99 },
    { name: "steak", type: "food", quantity: 2, price: 3.99 },
    { name: "blue cheese", type: "food", quantity: 1, price: 2.99 },
    { name: "candles", type: "home", quantity: 3, price: 1.99 },
    { name: "cheesecake", type: "food", quantity: 1, price: 4.99 },
    { name: "onions", type: "food", quantity: 3, price: 0.4 }
    ];
    function totalPrice(shoppingCart, type, discount){
        let total = 0;
        let discountAmount = (100 - discount) / 100;
        for (let i = 0; i < shoppingCart.length; i++){
            if (shoppingCart[i].type === type || type === 'any'){
                shoppingCart[i].price = shoppingCart[i].price * discountAmount;
            }
            total = total + (shoppingCart[i].price * shoppingCart[i].quantity);
        }
        return total; 
    } 
    let type = prompt('What type has a discount');
    let discount = prompt('What is the discount')
    let result = totalPrice(shoppingCart, type, discount);
    console.log(`Total: £${result.toFixed(2)}`);
    //Example 2
    const shoppingCart = [
    { name: "loaf of bread", type: "food", quantity: 1, price: 0.85 },
    { name: "multipack beans", type: "food", quantity: 1, price: 1 },
    { name: "mushrooms", type: "food", quantity: 10, price: 0.1 },
    { name: "can of beer", type: "alcohol", quantity: 4, price: 1.1 },
    { name: "prosecco", type: "alcohol", quantity: 1, price: 8.99 },
    { name: "steak", type: "food", quantity: 2, price: 3.99 },
    { name: "blue cheese", type: "food", quantity: 1, price: 2.99 },
    { name: "candles", type: "home", quantity: 3, price: 1.99 },
    { name: "cheesecake", type: "food", quantity: 1, price: 4.99 },
    { name: "onions", type: "food", quantity: 3, price: 0.4 }
    ];
    function betweenPrices(lowPrice, highPrice,quantity,shoppingCart){
        const arrItems = [];
        let totalPrice = 0;
        for(let i = 0;  i < shoppingCart.length; i++){
            if(quantity == true){
                totalPrice = shoppingCart[i].price * shoppingCart[i].quantity;
                if(totalPrice >= lowPrice && totalPrice <= highPrice){
                    arrItems.push(shoppingCart[i]);
                }      
            }
            else{
                if(shoppingCart[i].price >= lowPrice && shoppingCart[i].price <= highPrice){
                    arrItems.push(shoppingCart[i]);  
                }
                else{
                    console.log(`${shoppingCart[i].name} is not in between prices`);
                } 
            }
        }
        for(let j = 0; j < arrItems.length; j++){
            console.log(`${arrItems[i]}`);
        }
    }
    betweenPrices(2,5,true,shoppingCart);