``` val iterations = 100000 measureTimeMillis...
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val iterations = 100000

    measureTimeMillis {
        val mList = mutableListOf<Int>()
        for (x in 0 until iterations) { mList.add(x) }
    }.let { println("Mutable $it") }

    measureTimeMillis {
        var list = listOf<Int>()
        for (x in 0 until iterations) { list += x }
    }.let { println("Assign: $it") }