Database / Store Testing

Object.size = function(object) {
    var size = 0
    for (child in object) {
        if (object.hasOwnProperty(child)) {
            size++
        }
    }
    return size
}

var database = {}
var store = {}

database.people = {}

database.amount = {
    money : function(name) {
        return database.people[name].money || 0
    }
}

database.append = function(name, money) {
    database.people[name] = {name : name, money : money}
}

database.money = {
    deposit : function(name, amount) {
        database.people[name].money += amount
    },
    withdraw : function(name, amount) {
        database.people[name].money -= amount
    }
}

store.inventory = {}

store.items = {
    shirt : { price : 50 }
}

store.register = function(customer) {
    store.inventory[customer] = {}
}

store.getItems = function(customer) {
    for (belonging in store.inventory[customer]) {
        console.log(store.inventory[customer][belonging])
    }
}

store.purchase = function(customer, buy) {
    if (database.amount.money(customer) >= store.items[buy].price) {
        database.money.withdraw(customer, store.items[buy].price)
        store.inventory[customer][Object.size(store.inventory[customer])] = buy
    }
}