71 lines
2.2 KiB
Markdown
71 lines
2.2 KiB
Markdown
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# Chessboard
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Welcome to Chessboard on Exercism's Elixir Track.
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If you need help running the tests or submitting your code, check out `HELP.md`.
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If you get stuck on the exercise, check out `HINTS.md`, but try and solve it without using those first :)
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## Introduction
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## Ranges
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Ranges represent a sequence of one or many consecutive integers. They are created by connecting two integers with `..`.
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```elixir
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1..5
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```
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Ranges can be ascending or descending. They are always inclusive of the first and last values.
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A range implements the _Enumerable protocol_, which means functions in the `Enum` module can be used to work with ranges.
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## Instructions
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As a chess enthusiast, you would like to write your own version of the game. Yes, there maybe plenty of implementations of chess available online already, but yours will be unique!
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But before you can let your imagination run wild, you need to take care of the basics. Let's start by generating the board.
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Each square of the chessboard is identified by a letter-number pair. The vertical columns of squares, called files, are labeled A through H. The horizontal rows of squares, called ranks, are numbered 1 to 8.
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## 1. Define the rank range
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Implement the `rank_range/0` function. It should return a range of integers, from 1 to 8.
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```elixir
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Chessboard.rank_range()
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```
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## 2. Define the file range
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Implement the `file_range/0` function. It should return a range of integers, from the code point of the uppercase letter A, to the code point of the uppercase letter H.
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```elixir
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Chessboard.file_range()
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```
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## 3. Transform the rank range into a list of ranks
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Implement the `ranks/0` function. It should return a list of integers, from 1 to 8. Do not write the list by hand, generate it from the range returned by the `rank_range/0` function.
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```elixir
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Chessboard.ranks()
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# => [1, 2, 3, 4, 5, 6, 7, 8]
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```
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## 4. Transform the file range into a list of files
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Implement the `files/0` function. It should return a list of letters (strings), from "A" to "H". Do not write the list by hand, generate it from the range returned by the `file_range/0` function.
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```elixir
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Chessboard.files()
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# => ["A", "B", "C", "D", "E", "F", "G", "H"]
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```
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## Source
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### Created by
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- @angelikatyborska
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### Contributed to by
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- @neenjaw
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