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Sudoku -- solved up to first three tests #4

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77 changes: 76 additions & 1 deletion Sudoku/sudoku.js
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Original file line number Diff line number Diff line change
Expand Up @@ -4,14 +4,89 @@
//

var Sudoku = function(board) {

this.board = board;
};

Sudoku.prototype.isSolved = function() {

};

Sudoku.prototype.solve = function() {
const splitBoard = this.board.split('');
const boardArray = [];

// make an array of sudoku board rows
while(splitBoard.length > 0) {
boardArray.push(splitBoard.splice(0,9));
}

//verify that each row array has no repeats
let rowCheck = false
let columnCheck = false
let boardCheck = false
boardArray.forEach(function(subArray) {
let checkingArray = subArray.slice().sort();
for (let i = 0; i < checkingArray.length; i++) {
if ( /[0-9]/.test(checkingArray[i]) ) {
if (checkingArray[i] === checkingArray[i+1]) {
rowCheck = true
}
}
}
})

//verify each column has no repeats
let boardByColumns = boardArray[0].map(function(column, i) {
return boardArray.map(function(row) {
return row[i]
})
})

boardByColumns.forEach(function(subArray) {
let checkingArray = subArray.slice().sort();
for (let i = 0; i < checkingArray.length; i++) {
if ( /[0-9]/.test(checkingArray[i]) ) {
if (checkingArray[i] === checkingArray[i+1]) {
columnCheck = true
}
}
}
})

//check if a space's row & column contain all numbers 1-9 already
//iterate through rows
//for each row:
//iterate through each values
// for each value:
// iterate through row and save numbers -- [allNumbersRowsColumns]
// use index of value in row to get column
// iterate through column and save numbers --
// if value does not exist in the array already --> [allNumbersRowsColumns]
boardArray.forEach(function(subArray, rowIndex){
subArray.forEach(function(element, i, self){
let allNumbersRow = self.filter(function(element) {
return /[0-9]/.test(element)
})
let allNumbersColumn = boardByColumns[i].filter(function(element) {
return /[0-9]/.test(element)
})
let allNumbersRowsColumns = allNumbersColumn.concat(allNumbersRow)
let uniqueNumbers = allNumbersRowsColumns.filter(
function(element, index, self) {
return self.indexOf(element) === index
}
)
if (uniqueNumbers.length === 9) {
boardCheck = true
}
})
})


if (rowCheck || columnCheck || boardCheck) {
return "ERROR: Bad Board"
}


};

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32 changes: 16 additions & 16 deletions Sudoku/sudoku.spec.js
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Original file line number Diff line number Diff line change
Expand Up @@ -4,7 +4,7 @@ describe('Sudoku solver', function() {

// This board is bad because the middle column (c5) has the value ‘1’ twice.
it('Recognizes a bad board', function() {
var sudoku = new Sudoku("..9.7...5..21..9..1...28....7...5..1..851.....5....3.......3..68........21.....87");
var sudoku = new Sudoku("..9.7...5..2.1.9..1...28....7...5..1..851.....5....3.......3..68........21.....87");
expect(sudoku.solve()).toBe("ERROR: Bad Board");
});

Expand All @@ -21,84 +21,84 @@ describe('Sudoku solver', function() {
});

// This puzzle cannot be solved, because the center box (b5) has no possible candidates for the value ‘4’.
it('Detects an unsolvable box', function() {
xit('Detects an unsolvable box', function() {
var sudoku = new Sudoku(".9.3....1....8..46......8..4.5.6..3...32756...6..1.9.4..1......58..2....2....7.6.");
expect(sudoku.solve()).toBe("ERROR: Bad Board");
});

//This puzzle cannot be solved, because the middle column (c5) has no possible candidates for the value ‘2’.
it('Detects an unsolvable column', function() {
xit('Detects an unsolvable column', function() {
var sudoku = new Sudoku("....41....6.....2...2......32.6.........5..417.......2......23..48......5.1..2...");
expect(sudoku.solve()).toBe("ERROR: Bad Board");
});

// This puzzle cannot be solved, because the middle row (r5) has no possible candidates for the value ‘1’.
it('Detects an unsolvable row', function() {
xit('Detects an unsolvable row', function() {
var sudoku = new Sudoku("9..1....4.14.3.8....3....9....7.8..18....3..........3..21....7...9.4.5..5...16..3");
expect(sudoku.solve()).toBe("ERROR: Bad Board");
});

it('recognizes a solved board as solved', function() {
xit('recognizes a solved board as solved', function() {
var sudoku = new Sudoku("974236158638591742125487936316754289742918563589362417867125394253649871491873625");
expect(sudoku.isSolved()).toBe(true);
});

it('recognizes an unsolved board as solved', function() {
xit('recognizes an unsolved board as solved', function() {
var sudoku = new Sudoku("...236158638591742125487936316754289742918563589362417867125394253649871491873...");
expect(sudoku.isSolved()).toBe(false);
});

it('solves a board with only 1 missing square', function() {
xit('solves a board with only 1 missing square', function() {
var sudoku = new Sudoku("2564891733746159829817234565932748617128.6549468591327635147298127958634849362715");
expect(sudoku.solve()).toBe("256489173374615982981723456593274861712836549468591327635147298127958634849362715");
});

it('solves a board with only Naked Singles', function() {
xit('solves a board with only Naked Singles', function() {
var sudoku = new Sudoku("3.542.81.4879.15.6.29.5637485.793.416132.8957.74.6528.2413.9.655.867.192.965124.8");
expect(sudoku.solve()).toBe("365427819487931526129856374852793641613248957974165283241389765538674192796512438");
});

it('solves a board with hidden singles', function() {
xit('solves a board with hidden singles', function() {
var sudoku = new Sudoku("..2.3...8.....8....31.2.....6..5.27..1.....5.2.4.6..31....8.6.5.......13..531.4..");
expect(sudoku.solve()).toBe("672435198549178362831629547368951274917243856254867931193784625486592713725316489");
});

it('Recognizes if there are too many solutions', function() {
xit('Recognizes if there are too many solutions', function() {
var sudoku = new Sudoku(".................................................................................");
expect(sudoku.solve()).toBe("ERROR: Too many solutions");
});

it('Recognizes if there are insuficient givens', function() {
xit('Recognizes if there are insuficient givens', function() {
var sudoku = new Sudoku("...........5....9...4....1.2....3.5....7.....438...2......9.....1.4...6..........");
expect(sudoku.solve()).toBe("ERROR: Too many solutions");
});

// This puzzle is not a valid Sudoku, because it has two possible solutions.
it('Detects multiple solutions - 1', function() {
xit('Detects multiple solutions - 1', function() {
var sudoku = new Sudoku(".39...12....9.7...8..4.1..6.42...79...........91...54.5..1.9..3...8.5....14...87");
expect(sudoku.solve()).toBe("ERROR: No Unique Solution");
});

// This puzzle is not a valid Sudoku, because it has three possible solutions.
it('Detects multiple solutions - 2', function() {
xit('Detects multiple solutions - 2', function() {
var sudoku = new Sudoku("..3.....6...98..2.9426..7..45...6............1.9.5.47.....25.4.6...785...........");
expect(sudoku.solve()).toBe("ERROR: No Unique Solution");
});

// This puzzle is not a valid Sudoku, because it has four possible solutions.
it('Detects multiple solutions - 3', function() {
xit('Detects multiple solutions - 3', function() {
var sudoku = new Sudoku("....9....6..4.7..8.4.812.3.7.......5..4...9..5..371..4.5..6..4.2.17.85.9.........");
expect(sudoku.solve()).toBe("ERROR: No Unique Solution");
});

// This puzzle is not a valid Sudoku, because it has ten possible solutions.
it('Detects multiple solutions - 4', function() {
xit('Detects multiple solutions - 4', function() {
var sudoku = new Sudoku("59.....486.8...3.7...2.1.......4.....753.698.....9.......8.3...2.6...7.934.....65");
expect(sudoku.solve()).toBe("ERROR: No Unique Solution");
});

// This puzzle is not a valid Sudoku, because it has 125 possible solutions.
it('Detects multiple solutions - 5', function() {
xit('Detects multiple solutions - 5', function() {
var sudoku = new Sudoku("...3165..8..5..1...1.89724.9.1.85.2....9.1....4.263..1.5.....1.1..4.9..2..61.8...");
expect(sudoku.solve()).toBe("ERROR: No Unique Solution");
});
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