class Weapon extends Jig {
    init(damage) {
        this.damage = damage
    }
}


class Axe extends Weapon {
    init() {
        super.init(9001)
    }
}


new Axe() instanceof Weapon // true
                        
                    

                        
class LoyaltyCard extends Jig {
    init() {
        this.stamps = 0
    }

    stamp() {
        this.stamps += 1
    }
}
                        
                    

                        
class Product extends Jig {
    init(model, serial, date) {
        this.model = model
        this.serial = serial
        this.creation = date
    }

    transfer(to) {
        this.owner = to
    }
}
                        
                    

                        
class Vote extends Jig {
    vote(candidate) {
        this.candidate = candidate
    }
}


class Election extends Jig {
    // ...

    tally() {
        const counts = { 'Alice': 0, 'Bob': 0, 'Carol': 0 }
        this.voters.forEach((name, vote) => {
            counts[vote.candidate] += 1
        })
        return counts
    }
}
                        
                    

                        
class Dollar extends Token { }

Dollar.decimals = 2
Dollar.currency = 'USD'
Dollar.backingBank = 'HSBC'
Dollar.accountNumber = '#103947000'

run.deploy(Dollar)

const coin = Dollar.mint(100000)

coin.send(address, 1000)
                        
                    

                        
class User extends Jig { }


class UserGroup extends Jig {
    init() {
        this.users = []
    }

    addUser(user) {
        if (!this.users.includes(user)) {
            this.users.push(user)
        }
    }

    removeUser(user) {
        this.users = this.users.filter(u => user !== u)
    }
}