smokinggoats · April 5, 2020 15:21 · Apr 5, 2020
diff --git a/reference.js b/reference.js
@@ -0,0 +1,13 @@
+function GroceryList(items){
+  this.items = items;
+  this.mapItems = (fn) => {
+    let newItems = [];
+    // could use map but it would not fit for this example
+    for (let i = 0; i < this.items.length ; i++){
+      newItems = [...newItems, fn(this.items[i])];
+    }
+    this.items = newItems;
+    return this;
+  }
+  return this;
+}