Unique Email Aliases | Lightning Challenge

Generate unique email aliases by appending incremental numbers to a base email until a unique one is found. Check against a provided list of existing emails and return the first available alias. Return null when the base email is null or empty.

Examples:

Set<String> existing = new Set<String>{'user@domain.com', 'user1@domain.com'};
String alias = generateUniqueAlias('user@domain.com', existing);
// Results: 'user2@domain.com'

Set<String> empty = new Set<String>();
String original = generateUniqueAlias('test@example.com', empty);
// Results: 'test@example.com'

Set<String> existing = new Set<String>{'user@domain.com', 'user1@domain.com'};
String alias = generateUniqueAlias('user@domain.com', existing);
// Results: 'user2@domain.com'

Set<String> empty = new Set<String>();
String original = generateUniqueAlias('test@example.com', empty);
// Results: 'test@example.com'

Apex Code Editor

Welcome to Lightning Challenge!

Create an Account

Create account

How It Works

• Write your solution in the code editor
• Connect your Salesforce org to test
• Submit to check if your solution passes
• Use hints if you get stuck

Contest Alert

🏆 #CodeEveryDay Feb 2026

Contest runs February 1 - 28. Complete challenges to climb the leaderboard!

Points are calculated for challenges completed during the contest period.