Is there a short form to concat a string with another one into the same variable in dart?

Question

I want to build a string like this:

String mainString = "Hello, \n";
mainString = mainString + "World";
print(mainstring);

Is there a way to do this in dart without having to repeat the variable? Example of what I want done in perl:

my $main_string = "Hello, \n";
$main_string .= "World";
print($main_string);

Answer 1

You can write you code like this instead which are shorter:

void main() {
  String mainString = "Hello, \n";
  mainString += "World";
  print(mainString);
}

If you are going to concatenating a lot of strings (like e.g. in a loop) it is much more efficient to use StringBuffer to append the strings and then create the String object from the StringBuffer like:

void main() {
  final sb = StringBuffer("Hello, \n");
  sb.write("World");
  print(sb.toString());
}

The reason is by using the StringBuffer we don't need to create a new String object each time we concatenating a String to it.