sandwich-shop-with-cheese.js

function makeMeASandwich(x) {
    var ingredients = x.join(' ');
    var slices = 0;

    function barry() {
        return ingredients.concat(' sandwich');
    }
    function barryAddCheese() {
        slices += 2;
        return ingredients.concat(' sandwich with ', slices, ' slices of cheese');
    }
    return {
        noCheese: function() {
            return barry();
        },
        addCheese: function() {
            return barryAddCheese();
        }
    }
}