base-one-cents.js

const money = function() {
	const cent = "¢";
	const addCents = (base,amount) => {
		for(let i = 0;i<amount;i++) {
			base += cent;
		}
		return base;
	}
	let cents = "";
	let debt = "";
	this.getAmount = () => {
		return cents.length - debt.length;
	}
	this.withdrawl = (amount=0) => {
		if(amount < 0) {
			this.deposit(-amount);
			return;
		}
		const difference = cents.length - amount;
		if(difference < 0) {
			debt = addCents(debt,Math.abs(difference));
		}
		cents = cents.substring(0, difference);
	}
	this.deposit = (amount=0) => {
		if(amount < 0) {
			this.withdrawl(-amount);
			return;
		}
		const gain = amount - debt.length;
	 debt = debt.substring(0,debt.length-amount);
		if(gain) {
			cents = addCents(cents,gain);
		}
	}
}

const balance = new money();
balance.deposit(9);
balance.withdrawl(11);
balance.deposit(0);
balance.withdrawl(0);
balance.deposit(10);
balance.withdrawl(100);
console.log(balance.getAmount());