fun filterMap2Long(mapFunc: (Int) -> Int, filterFunc: (Int) -> Boolean): List<Int> { val list = mutableListOf<Int>() for (v in listOf(0, 1, 2, 3, 4)) { val w = mapFunc.invoke(v) if (filterFunc(w)) list.add(w) } return list } fun filterMap2Short(mapFunc: (Int) -> Int, filterFunc: (Int) -> Boolean): List<Int> = listOf(0, 1, 2, 3, 4) .map(mapFunc) .filter(filterFunc) fun main() { println(filterMap2Long({ it * 2 }, { it > 3 })) println(filterMap2Long({ it * 3 }, { it < 7 })) println(filterMap2Short({ (it * 10).toString().length }, { it == 1 })) println(filterMap2Short({ it }, { it >= 3 })) println(filterMap2Short({ it + 2 }, { it < 5 })) println(filterMap2Short({ it - 1 }, { it == 3 })) }