Dart Strings

String Creation Methods

String text = 'Hello Dart';

String text = "Hello Dart";

String name = 'Bob';
String greeting = 'Hi $name!';

String poem = '''
Line one
Line two
Line three
''';

🔹 Basic String Operations

Common operations you can perform with strings:

String firstName = 'John';
String lastName = 'Doe';

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

// String length
print(firstName.length); // Output: 4

// Convert to uppercase/lowercase
print(firstName.toUpperCase()); // Output: JOHN
print(lastName.toLowerCase()); // Output: doe

🔹 String Interpolation

Embed variables and expressions directly in strings:

String name = 'Alice';
int age = 25;
double height = 5.6;

// Simple interpolation
String intro = 'My name is $name';
print(intro);

// Expression interpolation
String details = 'I am ${age + 5} years old in 5 years';
print(details);

// Multiple variables
String info = '$name is $age years old and ${height}ft tall';
print(info);

🔹 String Methods

Useful methods for string manipulation:

String text = '  Hello Dart World  ';

// Remove whitespace
print(text.trim()); // Output: Hello Dart World

// Check if string contains substring
print(text.contains('Dart')); // Output: true

// Replace text
print(text.replaceAll('Dart', 'Flutter')); // Output:   Hello Flutter World  

// Split string into list
List<String> words = text.trim().split(' ');
print(words); // Output: [Hello, Dart, World]

// Check if string starts/ends with
print(text.trim().startsWith('Hello')); // Output: true
print(text.trim().endsWith('World')); // Output: true

🔹 Multi-line Strings

Create strings that span multiple lines:

// Using triple quotes
String multiLine = '''
This is line one
This is line two
This is line three
''';
print(multiLine);

// Raw strings (ignore escape sequences)
String rawString = r'This is a raw string with \n and \t';
print(rawString);

// String with escape sequences
String escaped = 'Line 1\nLine 2\tTabbed';
print(escaped);