javascriptNull / UndefinedEasy

Null check missing before property access

Time: 0:00

What it should do

getUserCity(user) should return the user's city, or "Unknown" if the user has no address on file.

What goes wrong

Calling getUserCity on a user without an address throws "Cannot read properties of undefined (reading 'city')".

Hints

This is a null and undefined errors bug

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