<@U092308M7>: I defined a `flatten()` function for...

# announcements

[tyrondis]

@orangy: I defined a flatten() function for a custom Array type:

fun <T> kotlin.Array<kotlin.Array<out T>>.flatten(): Array<T> {
        val result = Array<T>(sumBy { it.size })
        for (array in this) {
            for (element in array) {
                result.add(element)
            }
        }
        return result
    }

Then tried to write a unit test for it like so:

val arrayOfArrays = arrayOf(arrayOf(1), arrayOf(2, 3), arrayOf(4, 5, 6))
    val flattened = arrayOfArrays.flatten()

However, it gives me an error as it cannot apply Array<Array<T>> to Array<Array<out T>>