Object Composition

tshirtobj.js

const Item = function(name, cost){
    this.name = name;
    this.isTopLevel = true;
    this.baseCost = cost;
    this.attributes = [];
    this.totalCost = function(){
        let total = this.baseCost;
        this.attributes.map(x=>{
            total += x.cost;
        })
        return total;
    }
    this.addAttribute = function(type, value, cost){
        this.attributes.push({
            type: type,
            value: value,
            cost: cost
        })
    }
};

let newShirt = new Item('team tshirt', 16);
newShirt.addAttribute('size', 'extra-large', 5);
newShirt.addAttribute('color', 'blue', 0);
newShirt.addAttribute('logo', './image.png', 12);
newShirt.addAttribute('sleeves', 'short', 0);

console.log(JSON.stringify(newShirt));
console.log(`Total cost: ${newShirt.totalCost()}`);