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ChessPiece.js
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ChessPiece.js
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'use strict';
const pieces = [
'K',
'Q',
'R',
'B',
'N',
'P'];
class ChessPiece {
constructor(
notation, {
color = 'W',
hasMoved = false,
inCheck = false
} = {}) {
const piece = notation[0];
const file = notation[1];
const rank = notation[2];
this.color = color;
this.hasMoved = hasMoved;
this.inCheck = inCheck;
if (!pieces.includes(piece)) {
throw Error("invalid piece", piece);
}
if (file < 'a' || file > 'h') {
throw Error("invalid file")
}
if (rank < 1 || rank > 8) {
throw Error("invalid rank");
}
if (piece === 'P' && rank < 2) {
throw Error("pawns cannot be on first rank");
}
this.mustPromote = (piece === 'P' && rank === 8)
this.piece = piece;
this.position = {
file,
rank
}
}
denote() {
return color === 'B' ? '...' : '' + this.piece + this.position.file + this.position.rank;
}
}
module.exports = {
pieces,
ChessPiece
}