Playing with shopping cart exercise

gistfile1.txt

var cart = {
    items: [],
    promoCode: null
};

var add_item_to_cart = function(item, quantity) {
    for (var i=0; i<quantity; i++) {
        cart.items.push(item);
    }
};

console.log(cart);

var myItem = {
    id: 1,
    name: "Cool Thing!",
    shortDesc: "This thing is a thing that does stuff!"
};

add_item_to_cart(myItem, 1);
add_item_to_cart(myItem, 2);

console.log(cart);

var cart = {
items: [],
promoCode: null
};

var is_item_in_cart = function(item) {
for (var i=0; i<cart.items.length; i++) {
if (cart.items[i].id == item.id) {
return true;
}
}

return false;

};

var add_item_to_cart = function(item, quantity) {
for (var i=0; i<quantity; i++) {
cart.items.push(item);
}
};

var add_item_to_cart_2 = function(item, quantity) {
var cartItem = {
item: item,
quantity: quantity
};

cart.items.push(cartItem);

};

var myItem = {
id: 1,
name: "Cool Thing!",
shortDesc: "This thing is a thing that does stuff!"
};

add_item_to_cart(myItem, 1);
add_item_to_cart(myItem, 2);