War Card Game JavaScript: Keep Every Card in One Place

Select the code and use your copy shortcut. Changes in this preview are temporary.

<!doctype html>
<html lang="en"><head><meta charset="utf-8"><meta name="viewport" content="width=device-width,initial-scale=1"><title>War Card Game JavaScript: Keep Every Card in One Place</title><style>*{box-sizing:border-box}body{margin:0;color:var(--ink,#233342);background:var(--bg,#eef2f3);font:17px/1.6 system-ui,sans-serif}main{max-width:980px;margin:auto;padding:clamp(16px,4vw,38px)}h1{font:700 clamp(30px,5vw,49px)/1.12 Georgia,serif;margin:10px 0 20px;max-width:800px}h2{font-size:24px;line-height:1.3;margin:0 0 15px}h3{font-size:19px;margin:12px 0}p{margin:0 0 16px}.eyebrow{font-weight:750;letter-spacing:.08em;text-transform:uppercase;font-size:16px}header{padding:10px 0 25px;border-bottom:3px solid var(--accent,#24586d);margin-bottom:24px}.lede{font-size:20px;max-width:760px}.panel{background:var(--paper,#fff);padding:clamp(18px,3vw,28px);border:1px solid var(--line,#c6d1d8);border-radius:12px;margin:20px 0}.grid{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:20px}.grid>*{min-width:0}.row{display:flex;gap:12px;flex-wrap:wrap;align-items:center;margin:16px 0}.stack>*{margin:12px 0}button{font:700 17px/1.4 system-ui,sans-serif;cursor:pointer;color:white;background:var(--accent,#24586d);border:2px solid var(--accent,#24586d);border-radius:7px;padding:11px 17px;max-width:100%;overflow-wrap:anywhere}button.secondary{background:transparent;color:var(--ink,#233342)}button[aria-pressed=true]{box-shadow:inset 0 0 0 3px #fff;outline:2px solid var(--ink,#233342)}button:disabled{opacity:.55;cursor:default}input,textarea,select{font:17px/1.5 system-ui,sans-serif;color:inherit;background:white;border:1px solid #778591;padding:10px 12px;border-radius:6px;max-width:100%;width:100%;min-width:0}input[type=checkbox]{width:22px;height:22px}textarea{min-height:110px;resize:vertical}label{display:block;font-weight:700;margin:12px 0 7px}button:focus-visible,input:focus-visible,textarea:focus-visible,summary:focus-visible,[tabindex]:focus-visible{outline:3px solid #aa3d70;outline-offset:4px}.result{padding:18px;border-left:5px solid var(--accent,#24586d);background:var(--soft,#e5eff2);white-space:pre-wrap;overflow-wrap:anywhere;margin:20px 0}.result:empty{display:none}.hint{font-size:16px;color:var(--muted,#435968)}table{border-collapse:collapse;width:100%;table-layout:fixed;margin:16px 0}th,td{text-align:left;vertical-align:top;overflow-wrap:anywhere;padding:12px 8px;border-bottom:1px solid var(--line,#c6d1d8)}caption{text-align:left;font-weight:750;margin:8px 0}details{padding:18px;border:1px dashed #7b8b96;margin:20px 0}summary{cursor:pointer;font-weight:750}pre{font:16px/1.6 ui-monospace,monospace;white-space:pre-wrap;overflow-wrap:anywhere;background:#162735;color:#f5f8fa;padding:18px;border-radius:8px}canvas,svg{display:block;max-width:100%;height:auto}footer{margin:28px 0;font-size:16px}.badge{font-weight:750;color:var(--accent,#24586d)}.metric{font:700 38px/1.3 Georgia,serif}.board{display:grid;gap:5px;max-width:440px;margin:20px auto}.board button{padding:7px;min-height:45px}.sr{position:absolute;width:1px;height:1px;overflow:hidden;clip-path:inset(50%)}@media(max-width:560px){.grid{grid-template-columns:1fr}main{padding:16px}th,td{padding:10px 5px}.row button{flex-grow:1}.metric{font-size:32px}}
:root{--bg:#e6eee8;--paper:#fbfdf8;--accent:#365d47;--soft:#dfecdd;--ink:#273d2e}.queue{font:22px/1.7 ui-monospace,monospace}.pot{border:3px dashed #8a7450}.grid h2{font-family:Georgia,serif}</style></head><body><main><header><p class="eyebrow">Queue-and-pot lab · Eight original cards</p><h1>War Card Game JavaScript: Keep Every Card in One Place</h1><p class="lede">Resolve one battle, award its whole pot once, and keep an unresolved tie unresolved.</p><p class="hint">Original eight-card teaching variant, not standard 52-card War. No stakes, saved score or automatic play.</p></header><section class="panel"><h2>Resolve a whole battle</h2><div class="row"><button id="battle" type="button">Battle</button><button id="tie" type="button">Load insufficient-tie scenario</button><button id="reset" type="button" class="secondary">Reset original queues</button></div><p id="status" class="result" role="status"></p><div class="grid"><section><h2>Player A · front draws first</h2><p id="a" class="queue"></p></section><section><h2>Player B · front draws first</h2><p id="b" class="queue"></p></section></div><section class="panel pot"><h2>Contested pot</h2><p id="pot" class="queue"></p></section><p id="partition" class="result"></p><h2>Cards played and pots awarded</h2><pre id="history"></pre></section><footer>Locate all eight cards after an award and again when the tied pot cannot be resolved.</footer></main><script>
(()=>{'use strict';const $=id=>document.getElementById(id);
let a,b,pot,phase,battles,history,seen;const key=()=>JSON.stringify([a,b]);function render(){$('a').textContent=a.join(', ')||'Empty';$('b').textContent=b.join(', ')||'Empty';$('pot').textContent=pot.map(p=>p.id+' '+p.owner+' '+p.role).join(', ')||'Empty';const all=[...a,...b,...pot.map(p=>p.id)];$('partition').textContent='A '+a.length+' + B '+b.length+' + pot '+pot.length+' = '+all.length+' cards; distinct IDs: '+new Set(all).size+'.';$('status').textContent=phase+' · Battles: '+battles+(phase==='Won'?' · Winner '+(a.length===8?'A':'B')+'.':phase.endsWith('Stopped')||phase==='UnresolvedTie'?' · No winner.':'.');$('history').textContent=history.join('\n');}function setup(staged=false){a=['5a','2a','4a','3a'];b=staged?['5b','2b','4b','3b']:['5b','2b','3b','4b'];pot=[];phase='Ready';battles=0;history=staged?['Staged insufficient-tie variant loaded.']:[];seen=new Set([key()]);render();}function draw(queue,owner,role){const id=queue.shift();pot.push({id,owner,role});history.push(owner+' contributes '+id+' ('+role+').');return Number(id[0]);}function battle(){if(phase!=='Ready')return;phase='Resolving';battles++;history.push('Battle '+battles);let ar=draw(a,'A','face-up'),br=draw(b,'B','face-up');while(ar===br){if(a.length<2||b.length<2){phase='UnresolvedTie';history.push('Insufficient continuation: pot retained; no winner.');render();return;}draw(a,'A','face-down');draw(b,'B','face-down');ar=draw(a,'A','face-up');br=draw(b,'B','face-up');}const winner=ar>br?a:b,owner=ar>br?'A':'B',ids=pot.map(p=>p.id);winner.push(...ids);pot=[];history.push('Award once to '+owner+': '+ids.join(', '));if(a.length===8||b.length===8)phase='Won';else if(seen.has(key()))phase='CycleStopped';else if(battles>=100)phase='LimitStopped';else{seen.add(key());phase='Ready';}render();}$('battle').addEventListener('click',battle);$('tie').addEventListener('click',()=>setup(true));$('reset').addEventListener('click',()=>setup());setup();
})();
</script></body></html>