Objects in dart

You,Tue Oct 11 2022•dart + flutter

There are dart objects and JS style "OBJECTS"

The JS style objects are not true objects, but some kind of hash tables.
Class instances are true objects.

Here is some code to help clarify:

class Student 
  { 
  String stname = ""; 
  int stid = 0;
  
  Student(this.stname, this.stid); //shortcut constructor
 
  getInfo()
  {
  return "Student: name : $stname id: $stid"; 
  }
  
} 
 
class Momo
{
  String covering = "maida";
  String stuffing = "cabbage";
  
  Momo(String outerlayer, String inside)
  {
    covering = outerlayer;
    stuffing = inside;
  }
  
 getInfo()
 {
   return "This Momo has $stuffing covered by $covering";
 }
  
}
 
void main() 
  { 
  Student c = Student('Zoomer',42); 
  print("Type of c is: ${c.runtimeType}, it contains ${c.getInfo()}");
  
  Student d = Student ("zonto", 22);
  print("Type of d is: ${d.runtimeType}, it contains ${d.getInfo()}");  
  
  Momo m = Momo("atta","potato");
  print("Type of m is: ${m.runtimeType}, it contains ${m.getInfo()}");
  
  //in dart, this is not a class, it is a "Hashmap"
  var x = {"stname":"SuperBoy","stid":22};
  print("Type of x is: ${x.runtimeType}, it contains $x");
  
  }

Output:

Type of c is: Student, it contains Student: name : Zoomer id: 42
Type of d is: Student, it contains Student: name : zonto id: 22
Type of m is: Momo, it contains This Momo has potato covered by atta
Type of x is: JsLinkedHashMap<String, Object>, it contains {stname: SuperBoy, stid: 22}