Lesson: 83 | Eliminate Duplicate Integers from a List

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Write a code that efficiently removes duplicate integers from the given list.

List<Integer> codes = new List<Integer>{12, 5, 7, 12, 15, 15, 5, 7, 9};

Solution

Apex Method:

Create a Set to store unique elements:

List<Integer> codes = new List<Integer>{12, 5, 7, 12, 15, 15, 5, 7, 9};
System.debug('Original List: ' + codes);

Set<Integer> uniqueSet = new Set<Integer>(codes);

Clear the original list and add elements from the Set

List<Integer> codes = new List<Integer>{12, 5, 7, 12, 15, 15, 5, 7, 9};
System.debug('Original List: ' + codes);

Set<Integer> uniqueSet = new Set<Integer>(codes);

codes.clear();
codes.addAll(uniqueSet);

System.debug('List after removing duplicates: ' + codes);

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Lesson: 83 | Eliminate Duplicate Integers from a List

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Lesson: 83 | Eliminate Duplicate Integers from a List

User Story

Exercises