diff --git a/cardpile.js b/cardpile.js
new file mode 100644
index 0000000..c7b72f3
--- /dev/null
+++ b/cardpile.js
@@ -0,0 +1,39 @@
+class CardPile {
+  constructor() {
+    this.cards = new Set();
+  }
+
+  add(cardName) {
+    this.cards.add(cardName);
+  }
+
+  has(cardName) {
+    return this.cards.has(cardName);
+  }
+
+  get size() {
+    return this.cards.size;
+  }
+
+  drawRandom() {
+    const size = this.cards.size
+    if (size === 0) {
+      return null;
+    }
+    const index = Math.floor(Math.random() * Math.floor(size));
+    let i = 0;
+    let cardName = "";
+    for (let card of this.cards) {
+      if (i === index) {
+        cardName = card;
+        break
+      }
+      i++;
+    }
+    this.cards.delete(cardName);
+
+    return cardName;
+  }
+}
+
+export default CardPile;
diff --git a/tarot.js b/tarot.js
index e23b1b6..8fcf943 100644
--- a/tarot.js
+++ b/tarot.js
@@ -1,6 +1,5 @@
 import cardDB from './cards.js';
-
-// TODO reset state button
+import CardPile from './cardpile.js';
 
 class Tarot {
   constructor() {
@@ -130,42 +129,5 @@ class Renderer {
   }
 }
 
-class CardPile {
-  constructor() {
-    this.cards = new Set();
-  }
-
-  add(cardName) {
-    this.cards.add(cardName);
-  }
-
-  has(cardName) {
-    return this.cards.has(cardName);
-  }
-
-  get size() {
-    return this.cards.size;
-  }
-
-  drawRandom() {
-    const size = this.cards.size
-    if (size === 0) {
-      return null;
-    }
-    const index = Math.floor(Math.random() * Math.floor(size));
-    let i = 0;
-    let cardName = "";
-    for (let card of this.cards) {
-      if (i === index) {
-        cardName = card;
-        break
-      }
-      i++;
-    }
-    this.cards.delete(cardName);
-
-    return cardName;
-  }
-}
 
 export default Tarot;