JS1k: The JavaScript code golfing competition

var d=document,e=d.body,f="childNodes",g="className";e.removeChild(e.children[0]);function j(a,b){var c=d.createElement(b);a.appendChild(c);return c}j(e,"style").innerHTML="table{border-spacing:0}div{width:8px;height:8px;border:1px solid #444}div:hover{background:#888}.b div{background:#800}.o div{background:#00C}";var k=j(e,"table"),l=j(e,"h2"),m=50,n=50,p=8,q=0;function r(a,b){for(var c=0;c<a;++c)b(c)}function s(){l.innerHTML=(p==0&&n>0?"LOSE.":p)+" : "+(n==0?"WIN!":n)}function t(a,b){w(a,b,-1,0);w(a,b,1,0);w(a,b,0,-1);w(a,b,0,1)}function w(a,b,c,u){++q;(function v(h,i){if(h<0||h>=m||i<0||i>=m){if(--q==0){--p;s()}}else{var o=k[f][i][f][h];if(o[g]=="o"){o[g]="";--n;s();--q;t(h,i,c,u)}else{o[g]="b";setTimeout(function(){o[g]="";c!=0?v(h+c,i):v(h,i+u)},25)}}})(a,b)}r(m,function(a){var b=j(k,"tr");r(m,function(c){j(j(b,"td"),"div").onclick=function(){p>0&&n>0&&q==0&&t(c,a)}})});r(n,function(){for(;;){var a=k[f][Math.floor(Math.random()*m)][f][Math.floor(Math.random()*m)];if(a[g]!="o"){a[g]="o";break}}});s()

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

var doc = document, body = doc.body, childNodes = 'childNodes', className = 'className';

body.removeChild(body.children[0]);

function appendTo(parent, tagName) {
  var child = doc.createElement(tagName);
  parent.appendChild(child);
  return child;
}

appendTo(body, 'style').innerHTML = 'table{border-spacing:0}div{width:8px;height:8px;border:1px solid #444}div:hover{background:#888}.b div{background:#800}.o div{background:#00C}';
var board = appendTo(body, 'table');
var counter = appendTo(body, 'h2');

var size = 50, pieces = 50, moves = 8, bullets = 0;

function random() {
  return Math.floor(Math.random() * size);
}

function range(n, iterator) {
  for (var i = 0; i < n; ++i) iterator(i);
}

function updateStatus() {
  counter.innerHTML = (moves == 0 && pieces > 0 ? 'LOSE.' : moves) + ' : ' + (pieces == 0 ? 'WIN!' : pieces);
}

function fireBullets(x, y, dx, dy) {
  fireBullet(x, y, -1, 0);
  fireBullet(x, y, 1, 0);
  fireBullet(x, y, 0, -1);
  fireBullet(x, y, 0, 1);
}

function fireBullet(x, y, dx, dy) {
  ++bullets;

  (function moveBullet(x, y) {
    if (x < 0 || x >= size || y < 0 || y >= size) {
      if (--bullets == 0) {
        --moves; updateStatus();
      }
    } else {
      var cell = board[childNodes][y][childNodes][x];
      if (cell[className] == 'o') {
        cell[className] = '';
        --pieces; updateStatus();
        --bullets;
        fireBullets(x, y, dx, dy);
      } else {
        cell[className] = 'b';
        setTimeout(function () {
          cell[className] = '';
          if (dx != 0) moveBullet(x + dx, y);
          else moveBullet(x, y + dy);
        }, 25);
      }
    }
  }(x, y));
}

range(size, function (y) {
  var row = appendTo(board, 'tr');
  range(size, function (x) {
    appendTo(appendTo(row, 'td'), 'div').onclick = function () {
      if (moves > 0 && pieces > 0 && bullets == 0) fireBullets(x, y);
    };
  });
});

range(pieces, function () {
  for (;;) {
    var cell = board[childNodes][random()][childNodes][random()];
    if (cell[className] != 'o') {
      cell[className] = 'o';
      break;
    }
  }
});

updateStatus();