Dart String : Concatenation | Multiline Strings

In Dart, you can concatenate strings using the + operator or by using the ${expression} syntax within a string. Dart also supports multiline strings for more convenient representation of multiline text. Here's an overview:

String Concatenation:

1. Using the + Operator: You can concatenate strings using the + operator.

    String firstName = 'John';
    String lastName = 'Doe';
   
    String fullName = firstName + ' ' + lastName;
    print(fullName); // Output: John Doe
   

2. Using ${expression} Syntax: Dart allows you to embed expressions within strings using ${}.

    String firstName = 'John';
    String lastName = 'Doe';
   
    String fullName = '$firstName $lastName';
    print(fullName); // Output: John Doe
   

Multiline Strings:

Dart supports multiline strings using triple quotes (''' or """).

String multilineString = '''
  This is a multiline string
  that spans multiple lines.
  It's enclosed in triple quotes.
''';

print(multilineString);

You can also use the trim() method to remove leading and trailing whitespaces from each line:

String indentedMultilineString = '''
  This is an indented multiline string
  with leading and trailing whitespaces.
'''.trim();

print(indentedMultilineString);

Dart also supports raw strings, which treat escape sequences as literal characters. To create a raw string, prefix it with r:

String rawString = r'This is a raw string\nNo escape sequences';
print(rawString);

These features make working with strings in Dart flexible and expressive. Choose the approach that best fits your requirements and coding style.