Dart Data Types: Dart String & String Literals

In Dart, strings are used to represent sequences of characters. Dart supports both single-line and multi-line string literals. Here's an overview of Dart strings and string literals:

String Literals:

1. Single-Line String:

   • Created using single quotes (') or double quotes (").

   • No difference in functionality between single and double quotes.

    String singleLine1 = 'This is a single-line string.';
    String singleLine2 = "This is also a single-line string.";

1. Multi-Line String:

   • Created using triple single quotes (''') or triple double quotes (""").

   • Useful for representing strings that span multiple lines.

    String multiLine1 = '''
      This is a multi-line string.
      It can span across several lines.
    ''';

    String multiLine2 = """
      Another multi-line string.
      This one uses triple double quotes.
    """;

String Interpolation:

Dart supports string interpolation, allowing you to embed expressions within strings using ${}.

String name = 'John';
int age = 25;
String greeting = 'Hello, my name is $name and I am $age years old.';

Raw Strings:

Dart provides raw strings, denoted by the r prefix. In a raw string, escape sequences are treated as literal characters.

String rawString = r'This is a raw string \n with an escaped backslash.';

Escaping Characters:

You can escape characters in strings using the backslash (\) followed by the character to be escaped.

String escapedString = 'This string contains a newline character.\nAnother line.';

Unicode and Runes:

Dart strings support Unicode characters and can represent them using escape sequences or directly using the character.

String unicodeString = 'Dart supports Unicode characters: \u{1F604}'; // 😄

Operations on Strings:

Dart provides various methods and operators for string manipulation, such as concatenation (+), length retrieval (length), substring extraction (substring), and more.

String firstName = 'John';
String lastName = 'Doe';
String fullName = firstName + ' ' + lastName; // Concatenation
int length = fullName.length; // Length retrieval
String part = fullName.substring(0, 4); // Substring extraction

Understanding these features of Dart strings and string literals is essential for effective string manipulation in Dart programming.