Chain Of Responsibility js

ChainOfResponsibility.js

var CashMachine = function(amount) {

    this.amount = amount;
    log.add("Requested: $" + amount + "\n");
}

CashMachine.prototype = {
    get: function(bill) {
        var count = Math.floor(this.amount.toFixed(2) / bill);
        this.amount -= count * bill;
        log.add("Dispense " + count + " $" + bill + " bills");
        return this;
    }
}

var log = (function() {
    var log = "";

    return {
        add: function(msg) { log += msg + "\n"; },
        show: function() { console.log(log); log = ""; }
    }
})();

function requestMoney(money) {
     var request = new CashMachine(money);

    request
          .get(100)
          .get(50)
          .get(20)
          .get(10)
          .get(5)
          .get(1)
          .get(0.5)
          .get(0.25)
          .get(0.1)
          .get(0.01);

    log.show();
}

requestMoney(786.89);