Initial data commit

Task/Dice-game-probabilities/JavaScript/dice-game-probabilities.js

@@ -0,0 +1,42 @@
+let Player = function(dice, faces) {
+  this.dice = dice;
+  this.faces = faces;
+  this.roll = function() {
+    let results = [];
+    for (let x = 0; x < dice; x++)
+      results.push(Math.floor(Math.random() * faces +1));
+    return eval(results.join('+'));
+  }
+}
+
+function contest(player1, player2, rounds) {
+  let res = [0, 0, 0];
+  for (let x = 1; x <= rounds; x++) {
+    let a = player1.roll(),
+        b = player2.roll();
+    switch (true) {
+      case (a > b): res[0]++; break;
+      case (a < b): res[1]++; break;
+      case (a == b): res[2]++; break;
+    }
+  }
+  document.write(`
+      <p>
+        <b>Player 1</b> (${player1.dice} × d${player1.faces}): ${res[0]} wins<br>
+        <b>Player 2</b> (${player2.dice} × d${player2.faces}): ${res[1]} wins<br>
+        <b>Draws:</b> ${res[2]}<br>
+        Chances for Player 1 to win:
+        ~${Math.round(res[0] / eval(res.join('+')) * 100)} %
+      </p>
+  `);
+}
+
+let p1, p2;
+
+p1 = new Player(9, 4),
+p2 = new Player(6, 6);
+contest(p1, p2, 1e6);
+
+p1 = new Player(5, 10);
+p2 = new Player(6, 7);
+contest(p1, p2, 1e6);