git.cworth.org Git - lmno.games/blob - empathy/empathy.jsx

   1 const MAX_PROMPT_ITEMS = 20;
   2
   3 function undisplay(element) {
   4   element.style.display="none";
   5 }
   6
   7 function add_message(severity, message) {
   8   message = `<div class="message ${severity}" onclick="undisplay(this)">
   9 <span class="hide-button" onclick="undisplay(this.parentElement)">&times;</span>
  10 ${message}
  11 </div>`;
  12   const message_area = document.getElementById('message-area');
  13   message_area.insertAdjacentHTML('beforeend', message);
  14 }
  15
  16 /*********************************************************
  17  * Handling server-sent event stream                     *
  18  *********************************************************/
  19
  20 const events = new EventSource("events");
  21
  22 events.onerror = function(event) {
  23   if (event.target.readyState === EventSource.CLOSED) {
  24     setTimeout(() => {
  25       add_message("danger", "Connection to server lost.");
  26     }, 1000);
  27   }
  28 };
  29
  30 events.addEventListener("game-info", event => {
  31   const info = JSON.parse(event.data);
  32
  33   window.game.set_game_info(info);
  34 });
  35
  36 events.addEventListener("player-info", event => {
  37   const info = JSON.parse(event.data);
  38
  39   window.game.set_player_info(info);
  40 });
  41
  42 events.addEventListener("player-enter", event => {
  43   const info = JSON.parse(event.data);
  44
  45   window.game.set_other_player_info(info);
  46 });
  47
  48 events.addEventListener("player-update", event => {
  49   const info = JSON.parse(event.data);
  50
  51   if (info.id === window.game.state.player_info.id)
  52     window.game.set_player_info(info);
  53   else
  54     window.game.set_other_player_info(info);
  55 });
  56
  57 events.addEventListener("game-state", event => {
  58   const state = JSON.parse(event.data);
  59
  60   window.game.reset_game_state();
  61
  62   window.game.set_prompts(state.prompts);
  63
  64   window.game.set_active_prompt(state.active_prompt);
  65
  66   window.game.set_scores(state.scores);
  67
  68   window.game.set_ambiguities(state.ambiguities);
  69 });
  70
  71 events.addEventListener("prompt", event => {
  72   const prompt = JSON.parse(event.data);
  73
  74   window.game.add_or_update_prompt(prompt);
  75 });
  76
  77 events.addEventListener("start", event => {
  78   const prompt = JSON.parse(event.data);
  79
  80   window.game.set_active_prompt(prompt);
  81 });
  82
  83 events.addEventListener("player-answered", event => {
  84   const player = JSON.parse(event.data);
  85
  86   window.game.set_player_answered(player);
  87 });
  88
  89 events.addEventListener("player-answering", event => {
  90   const player = JSON.parse(event.data);
  91
  92   window.game.set_player_answering(player);
  93 });
  94
  95 events.addEventListener("vote-end-answers", event => {
  96   const player = JSON.parse(event.data);
  97
  98   window.game.set_player_vote_end_answers(player);
  99 });
 100
 101 events.addEventListener("unvote-end-answers", event => {
 102   const player = JSON.parse(event.data);
 103
 104   window.game.set_player_unvote_end_answers(player);
 105 });
 106
 107 events.addEventListener("ambiguities", event => {
 108   const ambiguities = JSON.parse(event.data);
 109
 110   window.game.set_ambiguities(ambiguities);
 111 });
 112
 113 events.addEventListener("player-judged", event => {
 114   const player = JSON.parse(event.data);
 115
 116   window.game.set_player_judged(player);
 117 });
 118
 119 events.addEventListener("player-judging", event => {
 120   const player = JSON.parse(event.data);
 121
 122   window.game.set_player_judging(player);
 123 });
 124
 125 events.addEventListener("vote-end-judging", event => {
 126   const player = JSON.parse(event.data);
 127
 128   window.game.set_player_vote_end_judging(player);
 129 });
 130
 131 events.addEventListener("unvote-end-judging", event => {
 132   const player = JSON.parse(event.data);
 133
 134   window.game.set_player_unvote_end_judging(player);
 135 });
 136
 137 events.addEventListener("scores", event => {
 138   const scores = JSON.parse(event.data);
 139
 140   window.game.set_scores(scores);
 141 });
 142
 143 /*********************************************************
 144  * Game and supporting classes                           *
 145  *********************************************************/
 146
 147 function copy_to_clipboard(id)
 148 {
 149   const tmp = document.createElement("input");
 150   tmp.setAttribute("value", document.getElementById(id).innerHTML);
 151   document.body.appendChild(tmp);
 152   tmp.select();
 153   document.execCommand("copy");
 154   document.body.removeChild(tmp);
 155 }
 156
 157 const GameInfo = React.memo(props => {
 158   if (! props.id)
 159     return null;
 160
 161   return (
 162     <div className="game-info">
 163       <span className="game-id">{props.id}</span>
 164       {" "}
 165       Share this link to invite friends:{" "}
 166       <span id="game-share-url">{props.url}</span>
 167       {" "}
 168       <button
 169         className="inline"
 170         onClick={() => copy_to_clipboard('game-share-url')}
 171       >Copy Link</button>
 172     </div>
 173   );
 174 });
 175
 176 const PlayerInfo = React.memo(props => {
 177   if (! props.player.id)
 178     return null;
 179
 180   return (
 181     <div className="player-info">
 182       <span className="players-header">Players: </span>
 183       {props.player.name}
 184       {props.player.score > 0 ? ` (${props.player.score})` : ""}
 185       {props.other_players.map(other => (
 186         <span key={other.id}>
 187           {", "}
 188           {other.name}
 189           {other.score > 0 ? ` (${other.score})` : ""}
 190         </span>
 191       ))}
 192     </div>
 193   );
 194 });
 195
 196 function fetch_method_json(method, api = '', data = {}) {
 197   const response = fetch(api, {
 198     method: method,
 199     headers: {
 200       'Content-Type': 'application/json'
 201     },
 202     body: JSON.stringify(data)
 203   });
 204   return response;
 205 }
 206
 207 function fetch_post_json(api = '', data = {}) {
 208   return fetch_method_json('POST', api, data);
 209 }
 210
 211 async function fetch_put_json(api = '', data = {}) {
 212   return fetch_method_json('PUT', api, data);
 213 }
 214
 215 class CategoryRequest extends React.PureComponent {
 216   constructor(props) {
 217     super(props);
 218     this.category = React.createRef();
 219
 220     this.handle_change = this.handle_change.bind(this);
 221     this.handle_submit = this.handle_submit.bind(this);
 222   }
 223
 224   handle_change(event) {
 225     const category_input = this.category.current;
 226     const category = category_input.value;
 227
 228     const match = category.match(/[0-9]+/);
 229     if (match) {
 230       const num_items = parseInt(match[0], 10);
 231       if (num_items <= MAX_PROMPT_ITEMS)
 232         category_input.setCustomValidity("");
 233     }
 234   }
 235
 236   async handle_submit(event) {
 237     const form = event.currentTarget;
 238     const category_input = this.category.current;
 239     const category = category_input.value;
 240
 241     /* Prevent the default page-changing form-submission behavior. */
 242     event.preventDefault();
 243
 244     const match = category.match(/[0-9]+/);
 245     if (match === null) {
 246       category_input.setCustomValidity("Category must include a number");
 247       form.reportValidity();
 248       return;
 249     }
 250
 251     const num_items = parseInt(match[0], 10);
 252
 253     if (num_items > MAX_PROMPT_ITEMS) {
 254       category_input.setCustomValidity(`Maximum number of items is ${MAX_PROMPT_ITEMS}`);
 255       form.reportValidity();
 256       return;
 257     }
 258
 259     const response = await fetch_post_json("prompts", {
 260       items: num_items,
 261       prompt: category
 262     });
 263
 264     if (response.status === 200) {
 265       const result = await response.json();
 266       if (! result.valid) {
 267         add_message("danger", result.message);
 268         return;
 269       }
 270     } else {
 271       add_message("danger", "An error occurred submitting your category");
 272     }
 273
 274     form.reset();
 275   }
 276
 277   render() {
 278     return (
 279       <div className="category-request">
 280         <h2>Submit a Category</h2>
 281         <p>
 282           Suggest a category to play. Don't forget to include the
 283           number of items for each person to submit.
 284         </p>
 285
 286         <form onSubmit={this.handle_submit} >
 287           <div className="form-field large">
 288             <input
 289               type="text"
 290               id="category"
 291               placeholder="6 things at the beach"
 292               required
 293               autoComplete="off"
 294               onChange={this.handle_change}
 295               ref={this.category}
 296             />
 297           </div>
 298
 299           <div className="form-field large">
 300             <button type="submit">
 301               Send
 302             </button>
 303           </div>
 304
 305         </form>
 306       </div>
 307     );
 308   }
 309 }
 310
 311 const PromptOptions = React.memo(props => {
 312
 313   if (props.prompts.length === 0)
 314     return null;
 315
 316   return (
 317     <div className="prompt-options">
 318       <h2>Vote on Categories</h2>
 319       <p>
 320         Select any categories below that you'd like to play.
 321         You can choose as many as you'd like.
 322       </p>
 323       {props.prompts.map(p => {
 324         return (
 325           <button
 326             className="vote-button"
 327             key={p.id}
 328             onClick={() => fetch_post_json(`vote/${p.id}`) }
 329           >
 330             {p.prompt}
 331             <div className="vote-choices">
 332               {p.votes.map(v => {
 333                 return (
 334                   <div
 335                     key={v}
 336                     className="vote-choice"
 337                   >
 338                     {v}
 339                   </div>
 340                 );
 341               })}
 342             </div>
 343           </button>
 344         );
 345       })}
 346     </div>
 347   );
 348 });
 349
 350 const LetsPlay = React.memo(props => {
 351
 352   const quorum = Math.round((props.num_players + 1) / 2);
 353   const max_votes = props.prompts.reduce(
 354     (max_so_far, v) => Math.max(max_so_far, v.votes.length), 0);
 355
 356   if (max_votes < quorum)
 357     return null;
 358
 359   const candidates = props.prompts.filter(p => p.votes.length >= quorum);
 360   const index = Math.floor(Math.random() * candidates.length);
 361   const winner = candidates[index];
 362
 363   return (
 364     <div className="lets-play">
 365       <h2>Let's Play</h2>
 366       <p>
 367         That should be enough voting. If you're not waiting for any
 368         other players to join, then let's start.
 369       </p>
 370       <button
 371         className="lets-play"
 372         onClick={() => fetch_post_json(`start/${winner.id}`) }
 373       >
 374         Start Game
 375       </button>
 376     </div>
 377   );
 378 });
 379
 380 class Ambiguities extends React.PureComponent {
 381
 382   constructor(props) {
 383     super(props);
 384
 385     const word_sets = props.words.map(word => {
 386       const set = new Set();
 387       set.add(word);
 388       return set;
 389     });
 390
 391     this.state = {
 392       word_sets: word_sets,
 393       submitted: false,
 394       selected: null
 395     };
 396   }
 397
 398   async handle_submit() {
 399     const response = await fetch_post_json(
 400       `judged/${this.props.prompt.id}`,{
 401         word_groups: this.state.word_sets.map(set => Array.from(set))
 402       }
 403     );
 404
 405     if (response.status === 200) {
 406       const result = await response.json();
 407       if (! result.valid) {
 408         add_message("danger", result.message);
 409         return;
 410       }
 411     } else {
 412       add_message("danger", "An error occurred submitting the results of your judging");
 413       return;
 414     }
 415
 416     this.setState({
 417       submitted: true
 418     });
 419   }
 420
 421   handle_click(word) {
 422     if (this.state.selected == word) {
 423       /* Second click on same word removes the word from the group. */
 424       const idx = this.state.word_sets.findIndex(s => s.has(word));
 425       const set = this.state.word_sets[idx];
 426       if (set.size === 1)
 427         return;
 428       const new_set = new Set([...set].filter(w => w !== word));
 429       this.setState({
 430         selected: null,
 431         word_sets: [...this.state.word_sets.slice(0, idx),
 432                     new_set,
 433                     new Set().add(word),
 434                     ...this.state.word_sets.slice(idx+1)]
 435       });
 436     } else if (this.state.selected) {
 437       /* Click of a second word groups the two together. */
 438       const idx1 = this.state.word_sets.findIndex(s => s.has(this.state.selected));
 439       const idx2 = this.state.word_sets.findIndex(s => s.has(word));
 440       const set1 = this.state.word_sets[idx1];
 441       const set2 = this.state.word_sets[idx2];
 442       const new_set = new Set([...set2, ...set1]);
 443       if (idx1 < idx2) {
 444         this.setState({
 445           selected: null,
 446           word_sets: [...this.state.word_sets.slice(0, idx1),
 447                       ...this.state.word_sets.slice(idx1 + 1, idx2),
 448                       new_set,
 449                       ...this.state.word_sets.slice(idx2 + 1)]
 450         });
 451       } else {
 452         this.setState({
 453           selected: null,
 454           word_sets: [...this.state.word_sets.slice(0, idx2),
 455                       new_set,
 456                       ...this.state.word_sets.slice(idx2 + 1, idx1),
 457                       ...this.state.word_sets.slice(idx1 + 1)]
 458         });
 459       }
 460     } else {
 461       /* First click of a word selects it. */
 462       this.setState({
 463         selected: word
 464       });
 465     }
 466   }
 467
 468   render() {
 469     if (this.state.submitted)
 470       return (
 471         <div className="please-wait">
 472           <h2>Submission received</h2>
 473           <p>
 474             The following players have completed judging:
 475             {[...this.props.players_judged].join(', ')}
 476           </p>
 477           <p>
 478             Still waiting for the following players:
 479           </p>
 480           <ul>
 481             {Object.entries(this.props.players_judging).map(player => {
 482               return (
 483                 <li
 484                   key={player}
 485                 >
 486                   {player}
 487                   {this.props.players_judging[player] ?
 488                    <span className="typing"/> : null }
 489                 </li>
 490               );
 491             })}
 492           </ul>
 493           <button
 494             className="vote-button"
 495             onClick={() => fetch_post_json(`end-judging/${this.props.prompt.id}`) }
 496           >
 497             Move On
 498             <div className="vote-choices">
 499               {[...this.props.votes].map(v => {
 500                 return (
 501                   <div
 502                     key={v}
 503                     className="vote-choice"
 504                   >
 505                     {v}
 506                   </div>
 507                 );
 508               })}
 509             </div>
 510           </button>
 511
 512         </div>
 513       );
 514
 515     const btn_class = "ambiguity-button";
 516     const btn_selected_class = btn_class + " selected";
 517
 518     return (
 519       <div className="ambiguities">
 520         <h2>Judging Answers</h2>
 521         <p>
 522           Click on each pair of answers that should be scored as equivalent,
 523           (and click any word twice to split it out from a group). Remember,
 524           what goes around comes around, so it's best to be generous when
 525           judging.
 526         </p>
 527         {this.state.word_sets.map(set => {
 528           return (
 529             <div
 530               className="ambiguity-group"
 531               key={Array.from(set)[0]}
 532             >
 533               {Array.from(set).map(word => {
 534                 return (
 535                   <button
 536                     className={this.state.selected === word ?
 537                                btn_selected_class : btn_class }
 538                     key={word}
 539                     onClick={() => this.handle_click(word)}
 540                   >
 541                     {word}
 542                   </button>
 543                 );
 544               })}
 545             </div>
 546           );
 547         })}
 548         <p>
 549           Click here when done judging:<br/>
 550           <button
 551             onClick={() => this.handle_submit()}
 552           >
 553             Send
 554           </button>
 555         </p>
 556       </div>
 557     );
 558   }
 559 }
 560
 561 class ActivePrompt extends React.PureComponent {
 562
 563   constructor(props) {
 564     super(props);
 565     const items = props.prompt.items;
 566
 567     this.state = {
 568       submitted: false
 569     };
 570
 571     this.answers = [...Array(items)].map(() => React.createRef());
 572     this.handle_submit = this.handle_submit.bind(this);
 573   }
 574
 575   async handle_submit(event) {
 576     const form = event.currentTarget;
 577
 578     /* Prevent the default page-changing form-submission behavior. */
 579     event.preventDefault();
 580
 581     const response = await fetch_post_json(`answer/${this.props.prompt.id}`, {
 582       answers: this.answers.map(r => r.current.value)
 583     });
 584     if (response.status === 200) {
 585       const result = await response.json();
 586       if (! result.valid) {
 587         add_message("danger", result.message);
 588         return;
 589       }
 590     } else {
 591       add_message("danger", "An error occurred submitting your answers");
 592       return;
 593     }
 594
 595     /* Everything worked. Server is happy with our answers. */
 596     form.reset();
 597     this.setState({
 598         submitted: true
 599     });
 600   }
 601
 602   render() {
 603     if (this.state.submitted)
 604       return (
 605         <div className="please-wait">
 606           <h2>Submission received</h2>
 607           <p>
 608             The following players have submitted their answers:
 609             {[...this.props.players_answered].join(', ')}
 610           </p>
 611           <p>
 612           Still waiting for the following players:
 613           </p>
 614           <ul>
 615             {Object.entries(this.props.players_answering).map(player => {
 616               return (
 617                 <li
 618                   key={player}
 619                 >
 620                   {player}
 621                   {this.props.players_answering[player] ?
 622                    <span className="typing"/> : null }
 623                 </li>
 624               );
 625             })}
 626           </ul>
 627           <button
 628             className="vote-button"
 629             onClick={() => fetch_post_json(`end-answers/${this.props.prompt.id}`) }
 630           >
 631             Move On
 632             <div className="vote-choices">
 633               {[...this.props.votes].map(v => {
 634                 return (
 635                   <div
 636                     key={v}
 637                     className="vote-choice"
 638                   >
 639                     {v}
 640                   </div>
 641                 );
 642               })}
 643             </div>
 644           </button>
 645
 646         </div>
 647       );
 648
 649     return (
 650       <div className="active-prompt">
 651         <h2>The Game of Empathy</h2>
 652         <p>
 653           Remember, you're trying to match your answers with
 654           what the other players submit.
 655           Give {this.props.prompt.items} answers for the following prompt:
 656         </p>
 657         <h2>{this.props.prompt.prompt}</h2>
 658         <form onSubmit={this.handle_submit}>
 659           {[...Array(this.props.prompt.items)].map((whocares,i) => {
 660             return (
 661               <div
 662                 key={i}
 663                 className="form-field large">
 664                 <input
 665                   type="text"
 666                   name={`answer_${i}`}
 667                   required
 668                   autoComplete="off"
 669                   ref={this.answers[i]}
 670                 />
 671               </div>
 672             );
 673           })}
 674
 675           <div
 676             key="submit-button"
 677             className="form-field large">
 678             <button type="submit">
 679               Send
 680             </button>
 681           </div>
 682
 683         </form>
 684       </div>
 685     );
 686   }
 687 }
 688
 689 class Game extends React.PureComponent {
 690   constructor(props) {
 691     super(props);
 692     this.state = {
 693       game_info: {},
 694       player_info: {},
 695       other_players: [],
 696       prompts: [],
 697       active_prompt: null,
 698       players_answered: new Set(),
 699       players_answering: {},
 700       end_answers_votes: new Set(),
 701       ambiguities: null,
 702       players_judged: new Set(),
 703       players_judging: {},
 704       end_judging_votes: new Set(),
 705       scores: null
 706     };
 707   }
 708
 709   set_game_info(info) {
 710     this.setState({
 711       game_info: info
 712     });
 713   }
 714
 715   set_player_info(info) {
 716     this.setState({
 717       player_info: info
 718     });
 719   }
 720
 721   set_other_player_info(info) {
 722     const other_players_copy = [...this.state.other_players];
 723     const idx = other_players_copy.findIndex(o => o.id === info.id);
 724     if (idx >= 0) {
 725       other_players_copy[idx] = info;
 726     } else {
 727       other_players_copy.push(info);
 728     }
 729     this.setState({
 730       other_players: other_players_copy
 731     });
 732   }
 733
 734   reset_game_state() {
 735     this.setState({
 736       prompts: [],
 737       active_prompt: null,
 738       players_answered: new Set(),
 739       players_answering: {},
 740       end_answers_votes: new Set(),
 741       ambiguities: null,
 742       players_judged: new Set(),
 743       players_judging: {},
 744       end_judging_votes: new Set(),
 745       scores: null
 746     });
 747   }
 748
 749   set_prompts(prompts) {
 750     this.setState({
 751       prompts: prompts
 752     });
 753   }
 754
 755   add_or_update_prompt(prompt) {
 756     const prompts_copy = [...this.state.prompts];
 757     const idx = prompts_copy.findIndex(p => p.id === prompt.id);
 758     if (idx >= 0) {
 759       prompts_copy[idx] = prompt;
 760     } else {
 761       prompts_copy.push(prompt);
 762     }
 763     this.setState({
 764       prompts: prompts_copy
 765     });
 766   }
 767
 768   set_active_prompt(prompt) {
 769     this.setState({
 770       active_prompt: prompt
 771     });
 772   }
 773
 774   set_player_answered(player) {
 775     const new_players_answering = {...this.state.players_answering};
 776     delete new_players_answering[player];
 777
 778     this.setState({
 779       players_answered: new Set([...this.state.players_answered, player]),
 780       players_answering: new_players_answering
 781     });
 782   }
 783
 784   set_player_answering(player) {
 785     this.setState({
 786       players_answering: {
 787         ...this.state.players_answering,
 788         [player]: {active: true}
 789       }
 790     });
 791   }
 792
 793   set_player_vote_end_answers(player) {
 794     this.setState({
 795       end_answers_votes: new Set([...this.state.end_answers_votes, player])
 796     });
 797   }
 798
 799   set_player_unvote_end_answers(player) {
 800     this.setState({
 801       end_answers_votes: new Set([...this.state.end_answers_votes].filter(p => p !== player))
 802     });
 803   }
 804
 805   set_ambiguities(ambiguities) {
 806     this.setState({
 807       ambiguities: ambiguities
 808     });
 809   }
 810
 811   set_player_judged(player) {
 812     const new_players_judging = {...this.state.players_judging};
 813     delete new_players_judging[player];
 814
 815     this.setState({
 816       players_judged: new Set([...this.state.players_judged, player]),
 817       players_judging: new_players_judging
 818     });
 819   }
 820
 821   set_player_judging(player) {
 822     this.setState({
 823       players_judging: {
 824         ...this.state.players_judging,
 825         [player]: {active: true}
 826       }
 827     });
 828   }
 829
 830
 831   set_player_vote_end_judging(player) {
 832     this.setState({
 833       end_judging_votes: new Set([...this.state.end_judging_votes, player])
 834     });
 835   }
 836
 837   set_player_unvote_end_judging(player) {
 838     this.setState({
 839       end_judging_votes: new Set([...this.state.end_judging_votes].filter(p => p !== player))
 840     });
 841   }
 842
 843   set_scores(scores) {
 844     this.setState({
 845       scores: scores
 846     });
 847   }
 848
 849   render() {
 850     const state = this.state;
 851     const players_total = 1 + state.other_players.length;
 852
 853     if (state.scores) {
 854       return (
 855         <div className="scores">
 856           <h2>Scores</h2>
 857           <ul>
 858             {state.scores.scores.map(score => {
 859               return (
 860                 <li key={score.player}>
 861                   {score.player}: {score.score}
 862                 </li>
 863               );
 864             })}
 865           </ul>
 866           <h2>Words submitted</h2>
 867           <ul>
 868             {state.scores.words.map(word => {
 869               return (
 870                 <li key={word.word}>
 871                   {`${word.word}: ${word.players.join(', ')}`}
 872                 </li>
 873               );
 874             })}
 875           </ul>
 876           <button
 877             className="new-game"
 878             onClick={() => fetch_post_json('reset') }
 879           >
 880             New Game
 881           </button>
 882         </div>
 883       );
 884     }
 885
 886     if (state.ambiguities){
 887       return <Ambiguities
 888                prompt={state.active_prompt}
 889                words={state.ambiguities}
 890                players_judged={state.players_judged}
 891                players_judging={state.players_judging}
 892                votes={state.end_judging_votes}
 893              />;
 894     }
 895
 896     if (state.active_prompt) {
 897       return <ActivePrompt
 898                prompt={state.active_prompt}
 899                players_answered={state.players_answered}
 900                players_answering={state.players_answering}
 901                votes={state.end_answers_votes}
 902              />;
 903     }
 904
 905     return [
 906       <GameInfo
 907         key="game-info"
 908         id={state.game_info.id}
 909         url={state.game_info.url}
 910       />,
 911       <PlayerInfo
 912         key="player-info"
 913         game={this}
 914         player={state.player_info}
 915         other_players={state.other_players}
 916       />,
 917       <p key="spacer"></p>,
 918       <CategoryRequest
 919         key="category-request"
 920       />,
 921       <PromptOptions
 922         key="prompts"
 923         prompts={state.prompts}
 924       />,
 925       <LetsPlay
 926         key="lets-play"
 927         num_players={1+state.other_players.length}
 928         prompts={state.prompts}
 929       />
 930     ];
 931   }
 932 }
 933
 934 ReactDOM.render(<Game
 935                   ref={(me) => window.game = me}
 936                 />, document.getElementById("empathy"));