@@ -0,0 +1,25 @@
+function Stack() {
+  const stack = []
+
+  return {
+    push(item) {
+      return stack.push(item)
+    },
+
+    pop() {
+      return stack.pop()
+    },
+
+    peek() {
+      return stack[this.length - 1]
+    },
+
+    get length() {
+      return stack.length
+    },
+
+    isEmpty() {
+      return this.length === 0
+    },
+  }
+}