chess.js

function getPieceName(pieceValue){
    switch (pieceValue) {
        case WHITE_KING:
            return 'WHITE_KING';
            break;
        case WHITE_QUEEN:
            return 'WHITE_QUEEN';
            break;
        case WHITE_ROOK:
            return 'WHITE_ROOK';
            break;
        case WHITE_BISHOP:
            return 'WHITE_BISHOP';
            break;
        case WHITE_KNIGHT:
            return 'WHITE_KNIGHT';
            break;
        case WHITE_PAWN:
            return 'WHITE_PAWN';
            break;
        
        case BLACK_KING:
            return 'BLACK_KING';
            break;
        case BLACK_QUEEN:
            return 'BLACK_QUEEN';
            break;
        case BLACK_ROOK:
            return 'BLACK_ROOK';
            break;
        case BLACK_BISHOP:
            return 'BLACK_BISHOP';
            break;
        case BLACK_KNIGHT:
            return 'BLACK_KNIGHT';
            break;
        case BLACK_PAWN:
            return 'BLACK_PAWN';
            break;
        
        default:
            return 'EMPTY';
            break;
    }
}