What is string interpolation in Dart?

void main() {
    
  // Assigning values to the variable
  String shot1 = "String";
  String shot2 = "interpolation";
  String shot3 = "in";
  String shot4 = "Dart programming";
    
  // Concatenate all values using 
  // string interpolation without space
  print('$shot1$shot2$shot3$shot4');
    
  // Concatenate all values using 
  // string interpolation with space
  print('\n');
  print('Now, include space between each value');
  print('\n');
  print('$shot1 $shot2 $shot3 $shot4');
}

void main() {
  String text = 'Educative';
  // text is an identifier 
  // so the {} can be omitted
  print('The word $text has ${text.length} letters'); 
}

void main(){
  List mylist = [10, 20, 30, 40, 50, 60];
  // Using map on list items
  List newList = [mylist.map((i) => i * i)];
  print("The list $mylist was squared to give a new list $newList");
  
  // Creating  Map items
  Map myMap = {"1": "String", "2": "literals"};
  
  print("This is a shot on ${myMap['1']} Interpolation");
  
}