Data commit

Task/Generate-Chess960-starting-position/JavaScript/generate-chess960-starting-position.js

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+function ch960startPos() {
+  var rank = new Array(8),
+      // randomizer (our die)
+      d = function(num) { return Math.floor(Math.random() * ++num) },
+      emptySquares = function() {
+        var arr = [];
+        for (var i = 0; i < 8; i++) if (rank[i] == undefined) arr.push(i);
+        return arr;
+      };
+  // place one bishop on any black square
+  rank[d(2) * 2] = "♗";
+  // place the other bishop on any white square
+  rank[d(2) * 2 + 1] = "♗";
+  // place the queen on any empty square
+  rank[emptySquares()[d(5)]] = "♕";
+  // place one knight on any empty square
+  rank[emptySquares()[d(4)]] = "♘";
+  // place the other knight on any empty square
+  rank[emptySquares()[d(3)]] = "♘";
+  // place the rooks and the king on the squares left, king in the middle
+  for (var x = 1; x <= 3; x++) rank[emptySquares()[0]] = x==2 ? "♔" : "♖";
+  return rank;
+}
+
+// testing (10 times)
+for (var x = 1; x <= 10; x++) console.log(ch960startPos().join(" | "));