Instructions

As a chess enthusiast, you want to write your own version of the game. Yes, there may be plenty of implementations of chess available online already, but yours will be unique!

You start with implementing a chess board.

The chess game will be played on an eight-square wide and eight-square long board. The squares are identified by a letter and a number.

1. Define rank & file range

The game will have to store the ranks of the board. The ranks are the rows of the board, and are numbered from 1 to 8.

The game will also have to store the files on the board. The files are the board's columns and are identified by the letters A to H.

Define the ranks and files constants that store the range of ranks and files respectively.

2. Check if square is valid

The game will have to check if a square is valid. A square is valid if the rank and file are within the ranges of the ranks and files.

Define the isValidSquare(rank:file:) method that takes the arguments rank that holds an Int of the rank and file that holds a String of the file. The method should return true if the rank and file are within the range of ranks and files, and return false otherwise.

3. Get row

The game will store all the squares of the board in a single dimensional array. The squares are formed as a string of the rank and file, e.g. "1A", "8B", "4G", etc. To get the row of a square, the game will have to calculate the index of the first square of the row.

Define the getRow(rank:) method that takes the argument rank that holds an Int of the rank. The method should return an array of strings that represent the squares of the row.