Basket app (test)

Assumptions

• Items are presented sequentially in an array or as a string
• One offer per item (this could be extended to support an array of offers)
• Products and offers are known in advance (these could be stored elsewhere)

Installation

1. Clone the repo
2. yarn or npm install
3. yarn test or npm test

Requires node 6.0.0+ for ES6 compatibility

Usage

add

Accepts string or array of strings and returns true if successful

basket.add(['Apple', 'Orange']);
basket.add('Apple');

empty

Removes all items from the basket

basket.empty();

getTotal

Returns the contents of the basket in JSON which is suitable for rendering by a view layer like React

basket.getTotal();

{
  "items": [
    {
      "name": "Papaya",
      "quantity": 3,
      "price": "£1.00",
      "discount": "£0.50"
    },
    {
      "name": "Garlic",
      "quantity": 2,
      "price": "£0.30"
    },
    {
      "name": "Apple",
      "quantity": 1,
      "price": "£0.25"
    },
    {
      "name": "Orange",
      "quantity": 2,
      "price": "£0.60"
    }
  ],
  "totalPrice": "£2.15",
  "totalItems": 8
}

Adding offers

Offers are just functions that receive the quantity, price, and total. The value returned is used as the discounted price.

Add new offers to offers.js:

module.exports = {
  someNewOffer(quantity, price, total) {
    // return a value
  },
};

The function name is used by the product in products.js

{
  'pears': {price: 25, offer: 'someNewOffer'},
}

Offers can be added to every product

TODO

Adding remove