Merge pull request nzakas#319 from kwasniew/defaultparams

Forcing default param to be undefined

Author: nzakas

manuscript/03-Functions.md

@@ -259,11 +259,11 @@ function add(first = second, second) {
     return first + second;
 }
 
-console.log(add(1, 1));     // 2
-console.log(add(1));        // throws error
+console.log(add(1, 1));         // 2
+console.log(add(undefined, 1)); // throws error
 ```
 
-The call to `add(1)` throws an error because `second` is defined after `first` and is therefore unavailable as a default value. To understand why that happens, it's important to revisit temporal dead zones.
+The call to `add(undefined, 1)` throws an error because `second` is defined after `first` and is therefore unavailable as a default value. To understand why that happens, it's important to revisit temporal dead zones.
 
 ### Default Parameter Value Temporal Dead Zone