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

l.foldMap(i => i.toString)
foldMap maps elements using provided function - in current example toString; then combines elements using Monoid of the result type: Monoid[String]. If only mapping was performed, the result would be List("1", "2", "3", "4", "5"). Performing combine results in String concatenation, which is "12345".

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