What will be the result of executing foldMap on List of Ints with identity function?
val l = List(1, 2, 3, 4, 5)

l.foldMap(identity)
Explanation
foldMap maps elements using provided function - in current example identity, which results in the same elements; then combines elements using Monoid of the result type: Monoid[Int]. If only mapping was performed, the result would be List(1, 2, 3, 4, 5). Performing combine results in sum of Ints, which is 15.

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