Sudoku-core NPM

A typescript Sudoku package for generating, solving (step-by-step or all), and analyzing Sudoku boards with ease. Perfect for building Sudoku games and integrating Sudoku functionality into your applications.

Downloads Contributors Issues License

About the package

gzipped size: 3.2k

Key Features:

Board Generation: Quickly create Sudoku boards for various difficulty levels.

Solver: Solve Sudoku puzzles.

Step-by-Step Solution: Walk through the solution process step by step, making it ideal for educational purposes or enhancing user engagement in Sudoku apps.

Board Analysis: Analyze the difficulty and strategies to solve a sudoku board.

Getting Started

Installation

npm install sudoku-core@latest

Usage

function	Input	Output
generate	"easy" \| "medium" \| "hard" \| "expert" \| "master"	Board
solve	Board	SolvingResult
hint	Board	SolvingResult
analyze	Board	AnalyzeData

board:

it has numbers from 1-9 or null
it has 81 cells
it's solvable (not by brute force)
there is only one version of answer to this board (not the process, the result) 1,null,9,5,8,null,null,6,3, ... 81 items

generate

Generates a new Sudoku puzzle.

// difficulty: easy - medium - hard - expert - master;
const board = generate("easy");
console.log(board);

[
  1,
  null,
  9,
  5,
  8,
  null,
  null,
  6,
  3
  //... 81 items
]

solve

Solves the entire puzzle.

const solvedBoard = solve(board);
console.log(solvedBoard);

{
  "solved": true,
  "board": [
    2,
    7,
    6,
    3,
    8,
    1,
    9
    // ... 81 items
  ],
  "steps": [
    {
      "strategy": "Single Candidate Strategy",
      "updates": [{
        "index": 5,
        "filledValue": 1,
        "eliminatedCandidate": null,
      }],
      "type": "value"
    },
    ...steps
  ],
  "analysis": {
    "hasSolution": true,
    "hasUniqueSolution": true,
    "usedStrategies": [
      { "title": "Single Remaining Cell Strategy", "frequency": 21 },
      ...strategies
    ],
    "difficulty": "master",
    "score": 2232
  }
}

hint

Solves the next step of the puzzle and return steps.

const solvedBoard = hint(board);
console.log(solvedBoard);

{
  "solved": true,
  "board": [
    null,
    7,
    6,
    null,
    null,
    1, // null => 1
    null
    // ... 81 items
  ],
  "steps": [
    {
      "strategy": "Single Candidate Strategy",
      "updates": [{
        "index": 5,
        "filledValue": 1,
        "eliminatedCandidate": null,
      }],
      "type": "value"
    }
  ],
  "analysis": {
    "hasSolution": true,
    "hasUniqueSolution": true,
    "usedStrategies": [
      { "title": "Single Remaining Cell Strategy", "frequency": 21 },
      ...strategies
    ],
    "difficulty": "master",
    "score": 2232
  }
}

analyze

Returns an analysis of the current board state.

const analyzeData = analyze(board);
console.log(analyzeData);

{
  "hasSolution": true,
  "hasUniqueSolution": true,
  "usedStrategies": [
    { "title": "Single Remaining Cell Strategy", "frequency": 21 },
    { "title": "Single Candidate Cell Strategy", "frequency": 11 },
    { "title": "Single Candidate Value Strategy", "frequency": 29 },
    { "title": "Pointing Elimination Strategy", "frequency": 27 }
  ],
  "level": "expert",
  "score": 1683.1
}

Project Stats

Alt

Roadmap

See the open issues for a list of proposed features (and known issues).

Contributing

Contributions are what make the open source community such an amazing place to be learn, inspire, and create. Any contributions you make are greatly appreciated.

If you have suggestions for adding or removing projects, feel free to open an issue to discuss it, or directly create a pull request after you edit the README.md file with necessary changes.
Please make sure you check your spelling and grammar.
Create individual PR for each suggestion.