Filtering an Array
From Progzoo
Filtering an Array
A filter applies a test to each element - it removes any element that fails the test.
Use another array to filter
You can build up the return list in another array. Because we may not know the size of the resulting array, we use an ArrayList, which can grow in size as needed, to accumulate the results; and then we copy them back into an array.
Return only the even numbers in the input list.
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