jsonycode
diff --git a/‎04_data.md‎
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diff --git a/‎06_object.md‎
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@@ -359,6 +359,16 @@ console.log(Object.keys({x: 0, y: 0, z: 2}));
 // → ["x", "y", "z"]
 ```
 
+You can use `Object.assign` to copy the properties from one object
+into another.
+
+```
+let objectA = {a: 1, b: 2};
+Object.assign(objectA, {b: 3, c: 4});
+console.log(objectA);
+// → {a: 1, b: 3, c: 4}
+```
+
 {{index array, collection}}
 
 Arrays, then, are just a kind of object specialized for storing
@@ -1562,7 +1572,7 @@ compare properties only when _both_ arguments are objects. In all
 other cases you can just immediately return the result of applying
 `===`.
 
-{{index "Object.keys method"}}
+{{index "Object.keys function"}}
 
 Use `Object.keys` to go over the properties. You need to test whether
 both objects have the same set of property names and whether those
 
@@ -1105,6 +1105,8 @@ hint}}
 
 {{index "list (exercise)", interface, "iterator interface"}}
 
+{{id list_iterator}}
+
 Make the `List` class from the previous exercise iterable. Refer back
 to the section about the iterator interface earlier in the chapter if
 you aren't clear on the exact form of the interface anymore.