javascriptNull / UndefinedHard

Null values bypassing defaults

Time: 0:00

What it should do

greet(user) should greet the user by name, falling back to "guest" when no name is available.

What goes wrong

greet({ name: null }) returns "hi null" instead of "hi guest", although greet({}) works fine.

Hints

This is a null and undefined errors bug

Cannot read properties of undefined, NoneType has no attribute, NaN appearing from nowhere.