Data update

Task/Associative-array-Merging/JavaScript/associative-array-merging.js

@@ -1,18 +1,19 @@
-(() => {
-    'use strict';
+const base = {
+    "name": "Rocket Skates",
+    "price": 12.75,
+    "color": "yellow"
+};
 
-    console.log(JSON.stringify(
-        Object.assign({}, // Fresh dictionary.
-            { // Base.
-                "name": "Rocket Skates",
-                "price": 12.75,
-                "color": "yellow"
-            }, { // Update.
-                "price": 15.25,
-                "color": "red",
-                "year": 1974
-            }
-        ),
-        null, 2
-    ))
-})();
+const update = {
+    "price": 15.25,
+    "color": "red",
+    "year": 1974
+};
+
+// While ES6 destructuring may be cleaner, using Object.assign (provided in the original answer) instead is about 15-20% faster.
+// source: https://jsbench.me/jom7uh9o1t/1
+
+const final = Object.assign(base, update);
+// Using ES6 destructuring method: const final = { ...base, ...update };
+
+console.log(JSON.stringify(final, null, 4));