Prerequisite

Please make sure you have the following installed

node (v15 or above)
yarn

Setting up

Clone the repo and change the working directory to snake-game-react cd snake-game-react
Run following command to install dependencies
```
yarn
```
You can push your changes to this repo by creating a new branch on your name.

Now you are ready for the challenges!

Challenge #1

You can find a next.js project located in pages/index.js. Run the following command to start the project

yarn dev

It will start the app at port 3005, visit http://localhost:3005 in your browser to view the app. In it you can find a classic snake game, but with a few things missing.

We want to test how you can onboard yourself to an unfamiliar project and start adding value. There are a few bugs that we want you to fix and a feature we want you to implement.

Your Tasks:

Currently when the snake eats a food, it doesn't change its size. Its size should increase by one every time it eats a food.
Currently it is possible to change direction to the opposite direction. Make it so that the snake can only change direction in a right angle. e.g: It will not possible to change from left direction to right, but will be possible to change from left to top or bottom.
Make it so that the snake dies and the game resets whenever the snake touches itself. When the snake crosses the grid boundary, make it reappear from the opposite direction.
Currently there is only one food in the grid and it stays there until the snake eats it. Make it so that
- there is a new food every 3 seconds
- each food should disappear after 10 seconds

What we are looking for:

We want to test how well you understand modern react concepts like components, states and effects - including effect cleanup. Please make sure to brush up your react hooks knowledge while working on the project.
Make sure to commit your code after each of the task and submit incomplete code even if they have bugs - it will increase your chances to have something work instead of nothing at all.
Real world is messy and often there are no instruction manuals, hence make sure to infer and follow coding guideline of existing codebase as best as you can.

Challenge #2

You can find this challenge in the __tests__ directory. There are two files,

__tests__/1/data.json contains the a JSON file with data
__tests__/1/1.js will be the file you'll be working on

The data contains the organizational tree of an organization. Here's what the schema looks like

type Person = {
  _id: string;
  isActive: boolean;
  balance: number;
  age: number;
  eyeColor: string;
  name: string;
  gender: "male" | "female";
  email: string;
  tags: Array<string>;
  location: {
    longitude: number
    latitude: number
  };
  subordinates: Array<Person>
}

In short, data.json contains data about each person in an organization in a hierarchical fornat. We would like you to write some small functions using basic javascript functions (without any libraries) to get useful insights from the data.

Before you start, run

yarn test

And you will see something like

Test Suites: 1 failed, 1 total
Tests:       13 failed, 5 passed, 18 total

There are 13 small functions for you to complete, while we've provided 5 completed example for your reference along with hints.

When you are done with a challenge and want to test, simply run yarn test again and it will run the test suit against your code and show the result.