Legal moves based on moveVectors

legalMovesWithBoard.js

module.exports = function (boardAndPiece, candidateMoves) {
    if (!boardAndPiece.board) return candidateMoves;

    const rangeChecks = {
        B: vectorChecks,
        R: vectorChecks,
        K: vectorChecks,
        Q: vectorChecks,
        P: pawnChecks,
        N: knightChecks
    };

    var rangeCheck = rangeChecks[boardAndPiece.piece.piece];
    return rangeCheck(boardAndPiece, candidateMoves)
}

//...

function vectorChecks(boardAndPiece, candidateMoves) {
    for (const [j, v] of candidateMoves.moveVectors.entries()) {
        for (const [i, m] of v.entries()) {
            const p = boardAndPiece.board.pieceAt(m);
            if (p) {
                if (p.color === boardAndPiece.piece.color) {
                    candidateMoves.moveVectors[j] = v.slice(0, i);
                    break;
                } else {
                    candidateMoves.moveVectors[j] = v.slice(0, i + 1);
                    Object.assign(candidateMoves.moveVectors[j].slice(-1)[0], {
                        hasCaptured: p
                    })
                    break;
                }
            }
        }
    }

    return {
        moveVectors: candidateMoves.moveVectors,
        moves: Array.prototype.concat(...candidateMoves.moveVectors)
    }
}