Function allDuplicates

Get an array of all the duplicate elements in an iterable.

Time complexity: O(n)

Space complexity: O(n)

Example

allDuplicates([1, 2, 2, 2, 3]); // [2, 2]
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Example

Using frequencyTable to get the number of times each element was duplicated

frequencyTable(allDuplicates([1, 2, 2, 2, 3, 3])); // Map(2) { 2 => 2, 3 => 1 }
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See

duplicates to receive a Set of duplicate elements instead of an array (which can include the same element more than once)