Post

How many chocolates can you get?

7 Aug 2016Harianto van Insulinde

javascript

While I was taking a break from programming, I saw a random post on 9gag and I thought I make a script for it.

alt

A shop sells 1 chocolate at $1. You can exchange 3 wrappers for 1 chocolate. If you have $15, how many chocolates can you get?

javascript

var getChocolates = function(dollar) {
    var price = 1,                      // Price per chocolate
        wrappersForChocolate = 3;       // Amount wrappers per exchange

    var chocolates = Math.floor(dollar/price);  // Round up no integers

    if(chocolates < 0) return 0;

    var count = 0;
    do {
        var exchanged = Math.floor(chocolates/wrappersForChocolate);
        var leftover = chocolates%wrappersForChocolate;

        var ate = exchanged * wrappersForChocolate;
        count += (ate < wrappersForChocolate) ? chocolates : ate;
        console.log('- chocolates:', chocolates, '- ate:', (ate < wrappersForChocolate) ? chocolates : ate);
        chocolates = (chocolates < wrappersForChocolate) ? 0 : leftover + exchanged;

    } while (chocolates);

    return count;
}

Let’s run this

javascript

var dollar = 15;
var chocolates = getChocolates(dollar);

console.log(chocolates);
// 22

The answer is: 22

Test this app out

Dollar:

For $, you'll get chocolates!!

new Vue({ el: '#app', data: { dollar: 15 }, computed: { chocolates: function() { return getChocolates(this.dollar) } } })

Made simplified version

javascript

var getChocolatesSimplified = function(dollar) {
    var price = 1,                     // Price per chocolate
        wrappersForChocolate = 3,      // Amount wrappers per exchange
        exchangedToChocolate = 1;      // Amount chocolates after exhange

    var chocolates = Math.floor(dollar/price); // Round up no integers
    if(chocolates < 0) return 0;       // Returns 0;

    var amountChocolate = Number(chocolates); // Copy amount


    var count = 0;
    do {
        if(chocolates < wrappersForChocolate) break;
        console.log('- chocolate:', chocolates);
        chocolates = chocolates -wrappersForChocolate+exchangedToChocolate;
        count++;

    }
    while (!(chocolates < wrappersForChocolate));

    return amountChocolate + count;
}