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@maxx1128 maxx1128/checksudoku.js
Last active Oct 6, 2019

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What would you like to do?
Check if you solved a Sudoku
const checkSudoku = board => {
const isSudokuArrayValid = (array) => {
const row = array.slice(0).sort().join(''),
passingRow = [1,2,3,4,5,6,7,8,9].join('');
return (row === passingRow);
};
const testRows = (board) => board.every(row => isSudokuArrayValid(row));
const testColumns = (board) => {
const gatherColumn = (board, columnNum) => board.reduce((total, row) => [...total, row[columnNum]], []);
return [0,1,2,3,4,5,6,7,8].every(i => isSudokuArrayValid(gatherColumn(board, i)));
}
const testSquares = (board) => {
const getSquareIndexes = (num) => {
if (num === 1) {
return [0,1,2];
} else if (num === 2) {
return [3,4,5];
} else {
return [6,7,8];
}
}
const getSquareValues = (x, y, board) => {
let values = [],
rows = getSquareIndexes(x),
columns = getSquareIndexes(y);
rows.forEach(row => {
columns.forEach(column => {
values.push(board[row][column]);
});
});
return values;
};
const squareSections = [1,2,3];
return squareSections.every(squareX => {
return squareSections.every(squareY => isSudokuArrayValid(getSquareValues(squareX, squareY, board)));
});
};
return (testRows(board) && testColumns(board) && testSquares(board)) ? 'Finished!' : 'Try again!';
}
const pass = checkSudoku([
[5, 3, 4, 6, 7, 8, 9, 1, 2],
[6, 7, 2, 1, 9, 5, 3, 4, 8],
[1, 9, 8, 3, 4, 2, 5, 6, 7],
[8, 5, 9, 7, 6, 1, 4, 2, 3],
[4, 2, 6, 8, 5, 3, 7, 9, 1],
[7, 1, 3, 9, 2, 4, 8, 5, 6],
[9, 6, 1, 5, 3, 7, 2, 8, 4],
[2, 8, 7, 4, 1, 9, 6, 3, 5],
[3, 4, 5, 2, 8, 6, 1, 7, 9]
]);
const fail = checkSudoku([
[5, 3, 4, 6, 7, 8, 9, 1, 2],
[6, 7, 2, 1, 9, 0, 3, 4, 9],
[1, 0, 0, 3, 4, 2, 5, 6, 0],
[8, 5, 9, 7, 6, 1, 0, 2, 0],
[4, 2, 6, 8, 5, 3, 7, 9, 1],
[7, 1, 3, 9, 2, 4, 8, 5, 6],
[9, 0, 1, 5, 3, 7, 2, 1, 4],
[2, 8, 7, 4, 1, 9, 6, 3, 5],
[3, 0, 0, 4, 8, 1, 1, 7, 9]
]);
console.log(pass);
// 'Finished!'
console.log(fail);
// 'Try again!'
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