JSFoundations-Classes: A JavaScript repository from A-Abdeen

In this exercise we're going to design the objects for an on-demand ice cream delivery platform called Bareed.

Requirements:

The objects have the following properties and methods:

Point:
- x - x coordinate.
- y - y coordinate.
- distanceTo(point) - takes a Point, calculates the distance to that point from the current point.
Wallet:
- money - defaults to 0.
- credit(amount) - adds amount to money.
- debit(amount) - subtracts amount from money.
Person:
- name
- location - a Point.
- wallet - a Wallet initially with 0.
- moveTo(point) - moves the person to the new point.
Vendor:
- name
- location - a Point.
- wallet - a Wallet initially with 0.
- range - the maximum distance this vendor can travel - initially 5.
- price - the cost of a single ice cream - initially 1.
- moveTo(point) - moves the customer to the new point.
- sellTo(customer, numberOfIceCreams) - sells a specific number of ice creams to customer by doing the following:
  - Move to the customer's location.
  - Transfer money from the customer's wallet to the vendor's wallet.
    NOTE: You might have to partially build the Customer class first before you can get this to work!
Customer:
- name
- location - a Point.
- wallet - a Wallet initially with 10.
- moveTo(point) - moves the customer to the new point.
- _isInRange(vendor) - checks if the customer is in range of vendor.
- _haveEnoughMoney(vendor, numberOfIceCreams) - checks if the customer has enough money to buy a specific number of ice creams from vendor.
- requestIceCream(vendor, numberOfIceCreams) - sends a request to vendor to buy a specific number of ice creams but ONLY IF the customer is in the vendor's range AND they have enough money to buy that much ice cream. ONLY THEN is a request sent.
  BONUS: Log a helpful message to let the customer know why they can't have ice cream.
  NOTE: You might have to partially build the Vendor class first before you can get this to work!

Example Usage

let vendorAsis = new Vendor("Asis", 10, 10); // create a new vendor named Asis at location (10,10)
let nearbyCustomer = new Customer("MishMish", 11, 11); // create a new customer named MishMish at location (11,11)
let distantCustomer = new Customer("Hamsa", 1000, 1000); // create a new customer named Hamsa at location (1000,1000)
let brokeCustomer = new Customer("Maskeen", 12, 12); // create a new customer named Maskeen at location (12,12)

brokeCustomer.wallet.money = 0; // steal all of Maskeen's money

nearbyCustomer.requestIceCream(vendorAsis, 10); // ask to buy 10 ice creams from Asis
// money was transferred from MishMish to Asis
nearbyCustomer.wallet.money; // 0 left
vendorAsis.wallet.money; // 10
// Asis moved to MishMish's location
vendorAsis.location; // { x: 11, y: 11 }

distantCustomer.requestIceCream(vendorAsis, 10); // ask to buy 10 ice creams from Asis
// no money was transferred because the request failed - Hamsa is too far away
distantCustomer.wallet.money; // 10 left
vendorAsis.wallet.money; // still only 10
// Asis didn't move
vendorAsis.location; // { x: 11, y: 11 }

brokeCustomer.requestIceCream(vendorAsis, 1); // ask to buy 1 ice creams from Asis
// no money was transferred because the request failed - Maskeen doesn't have enough money to buy even one ice cream :(
brokeCustomer.wallet.money; // 0
vendorAsis.wallet.money; // still only 10
// Asis didn't move
vendorAsis.location; // { x: 11, y: 11 }

Instructions

Tools

Install node:
```
$ brew install node
```
Install yarn:
```
$ brew install yarn --without-node
```

The Files

Fork this repository and clone your fork (make sure you clone it into your development directory):

$ git clone https://github.com/<your_username>/JSFoundations-Classes.git

Inside you'll find the following:

bareed.js - this is the file you'll be editing
tests/ - this is a directory of testing files. These files check that your application has the features discussed above.
DO NOT EDIT THIS FILE

Running The Tests

Install all the requirements:

Navigate to the project root (you'll find a file called package.json there).
Install the requirements using yarn install.

Run the tests:

$ yarn test

This command will run the testing file and test your pairs() function to make sure it has all the required features.