DART

flutter check variable has object

void main(){
  var a = 'Apple';
  var b = 100;
  var c = [1, 2, 3, 4, 5];
  var d = {
    "name": "John Doe",
    "age" : 40
  };
  var e = 1.14;
  
  print(a.runtimeType); // String
  print(b.runtimeType); // int
  print(c.runtimeType); // JSArray<int>
  print(d.runtimeType); // JsLinkedHashMap<String, Object>
  print(e.runtimeType); // double
}