+ // https://stackoverflow.com/a/38750895
+ const allowed = ['appear', 'vanish', 'start', 'end'];
+ const filtered_move = Object.keys(o.move)
+ .filter(key => allowed.includes(key))
+ .reduce((obj, key) => {
+ obj[key] = raw[key];
+ return obj;
+ }, {});
+ gameState.moves.push(filtered_move);
+ gameState.fen = o.move.fen;
+ const colorIdx = ["w","b","g","r"][o.move.color];
+ gameState.clocks[colorIdx] = o.move.clock;