Dart vs Kotlin: type check and cast operators

cast.dart

import 'package:collection/collection.dart';

void main() {
  Iterable iterable1 = [1, 2, 3];
  Iterable iterable2 = {1, 2, 3};
  if (iterable1 is List && iterable2 is List) {
    iterable1.shuffle(); // Smart cast from Iterable to List
    print(ListEquality().equals(iterable1, iterable2));
  } else {
    print(IterableEquality().equals(iterable1, iterable2));
  }
  if (iterable1 is! List) {
    throw ArgumentError("A list is required");
  }
  final list = iterable1;
  final set = iterable2 as Set; // Explicit cast
}

cast.kt

fun main() {
    var iterable1: Iterable<Int> = mutableListOf(1, 2, 3)
    var iterable2: Iterable<Int> = setOf(1, 2, 3)
    if (iterable1 is MutableList && iterable2 is List) {
        iterable1.shuffle() // Smart cast from Iterable to MutableList
        print(iterable1 == iterable2)
    } else {
        print(iterable1 == iterable2)
    }
    if (iterable1 !is List) {
        error("A list is required")
    }
    val list = iterable1
    val set = iterable2 as Set // Explicit cast
}