function parseFen(fen) {
const [board, activeColor, castling, enPassant, halfMoves, fullMoves] = fen.split(' ');
const ranks = board.split('/');
const pieces = ranks.map(rank => rank.split('').reduce((acc, char) => {
if (/\d/.test(char)) {
return acc + ' '.repeat(Number(char));
}
return acc + char;
}, ''));
return {
pieces: pieces.join('').split(''),
activeColor,
castling,
enPassant,
halfMoves: Number(halfMoves),
fullMoves: Number(fullMoves),
};
}
const fenString = 'rnbqkbnr/pppp1ppp/8/4p3/4P3/8/PPPP1PPP/RNBQKBNR w KQkq e3 0 1';
const parsedFen = parseFen(fenString);
console.log('Parsed FEN:', parsedFen);
