boggle-game-solver/dist/findAdjacents.js

Expansion of node-boggle-solver by adding multiple dictionary options.

const utils = require('./utils')

const directions = [[-1,-1],[-1,0],[-1,1],[0,-1],[0,1],[1,-1],[1,0],[1,1]];

module.exports= function findAdjacents(position, size, filter = []) {
  const allDirections = directions.slice(0);
  const [row, col] = position;

  return allDirections.reduce((adjacents, direction) => {
    const [x, y] = direction;
    const rowSum = (x < 0) ? row - Math.abs(x) : row + x;
    const colSum = (y < 0) ? col - Math.abs(y) : col + y;

    const validPosition = (rowSum >= 0 && colSum >= 0);
    const validSize = (rowSum < size && colSum < size);

    if (validPosition && validSize) {
      const adjacent = [rowSum, colSum];

      if (!utils.arrayMatch(filter, adjacent)) {
        adjacents.push(adjacent);
      }
    }

    return adjacents;
  }, []);
}