# project-lvl1-s89

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A set of mini-games launched from the console. These games are similar to what is usually called Brain Games.

## Table of Contents
- [Installation](#installation)
- [List of games](#list-of-games)
  - [Greeting](#greeting)
  - [Game: "Check for parity"](#game-check-for-parity)
  - [Game: "Calculator"](#game-calculator)
  - [Game: "The greatest common divisor (GCD)"](#game-the-greatest-common-divisor-gcd)
  - [Game: "Balance"](#game-balance)
  - [Game: "Arithmetic progression"](#game-arithmetic-progression)
  - [Game: "Is it a prime number?"](#game-is-it-a-prime-number)
  
### Installation
1. Install package globally ```npm i -g brain-games-lvl1-s89```.
1. Add folder with bin files to environment variable ```PATH```

```$ PATH=$PATH:~/<path to node>/lib/node_modules/brain-games-lvl1-s89/dist/bin/```

[![asciicast](https://asciinema.org/a/1tljpb5aisqk5nc5hezzfsm84.png)](https://asciinema.org/a/1tljpb5aisqk5nc5hezzfsm84)

### List of games
#### Greeting
Greets user
##### How to play
```$ brain-games```

#### Game: "Check for parity"
The essence of the game is as follows: the user is shown a random number. And he needs to answer **Yes**, if the number is even, or **No** - if odd.
Any incorrect entry is considered an error, for example, **n** and is equivalent to an incorrect answer.

##### How to play
```$ brain-even```

[![asciicast](https://asciinema.org/a/b3fznmuk2e29p9dmm4lfv29ee.png)](https://asciinema.org/a/b3fznmuk2e29p9dmm4lfv29ee)

#### Game: "Calculator"
The essence of the game is as follows: the user is shown a random mathematical expression, for example 35 + 16, which he/she needs to calculate and write the correct answer.

##### How to play
```$ brain-calc```

#### Game: "The greatest common divisor (GCD)"
The essence of the game is as follows: the user is shown two random numbers, for example, 25 50. The user must calculate and enter the greatest common divisor of these numbers.

##### How to play
```$ brain-gcd```

#### Game: "Balance"
A balanced number is a number in which the smallest digit differs from the largest one by more than one.

Examples of balanced numbers are ```111```, ```233```, ```55```, ```001```, ```9999```, ```0001```.

And, for example, the number ```123``` is not balanced because the smallest digit in it is ```1```, and the largest one is ```3```, and the difference between them is ```2```. When balancing the numbers, "large" digits give the excess "smaller" so that the number eventually becomes Balanced. In the case of the number ```123```, the number ```3``` should give the number ```1```, and in the end we get the number ```222```.

The order of digits in a balanced number is in ascending order. For example, instead of ```322``` and ```232```, you need to specify ```223```.

##### How to play
```$ brain-balance```

#### Game: "Arithmetic progression"
The player must determine the lost number.
```5 7 9 11 13 .. 17 19 21 23```
Answer is ```15```

##### How to play
```$ brain-progression```

#### Game: "Is it a prime number?"
Is it a prime number?

##### How to play
```$ brain-prime```