Given a list of lists of integers (nested list), flatten it into a single list containing all integers in order. For example, [[1, 2], [3, 4], [5]] should become [1, 2, 3, 4, 5].
Return an empty list for null or empty input.
Examples:
Input: nestedList = [[1, 2], [3, 4], [5]]
Output: [1, 2, 3, 4, 5]
Explanation: All integers from sublists combined into single list
Input: nestedList = [[10], [20, 30], [40, 50, 60]]
Output: [10, 20, 30, 40, 50, 60]
Explanation: Flatten three sublists into one list
Input: nestedList = null
Output: []
Explanation: Null input returns empty list
Apex Code Editor
Welcome to Lightning Challenge!
Create an Account
Sign up to track your progress, earn points, and compete with others. Your solutions will be saved automatically.
Create accountHow 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
Note
You can test your code by connecting to Salesforce, but to save your progress and earn points, you'll need to create an account. Your solutions and achievements will be tracked automatically once you're logged in.