This question runs in a pre-configured Salesforce environment - no personal connection required.
Query the Contact object and return a list of Ids for every Contact whose Email field is null. The order of the returned Ids does not matter.
Examples:
Input: (none)
Output: [003xx000004TmiQ, 003xx000004TmiR, ...]
Explanation: All Contacts with no Email value are returned
Input: (none, no contacts missing Email)
Output: []
Explanation: An empty list is returned when every Contact has an Email
Apex Code Editor
Welcome to Lightning Challenge!
How It Works
- • Write your solution in the code editor
- • This challenge runs without connecting your own org
- • Submit to check if your solution passes
- • Use hints if you get stuck
Contest Alert
🏆 #CodeEveryDay July 2026
Contest runs July 1 - 31. Complete challenges to climb the leaderboard!
Only the 31 daily challenges shown during this contest count toward points. Earlier dailies don't carry over.