Initial release

Signed-off-by: Hans Kokx <hans.d.kokx@gmail.com>

lib/src/extensions/string.dart

@@ -0,0 +1,61 @@
+/// Provides a quick shortcut to common strings, such as punctuation marks that are otherwise
+/// cumbersome to find or type.
+abstract class CommonString {
+  /// An em dash (`—`) is commonly used in typography to set off parenthetical
+  /// phrases or provide emphasis in a sentence.
+  static const String emDash = "—";
+}
+
+extension Nullability on String? {
+  /// Returns `true` if the `String?` is neither `null` nor only contains whitespace.
+  bool get isNotNullOrEmpty => !isNullOrEmpty;
+
+  /// Returns `true` if the `String?` is either `null` or contains only  whitespace.
+  bool get isNullOrEmpty => this == null || (this ?? "").trim().isEmpty;
+}
+
+/// An extension on `String` to split the string into parts of a specified length.
+extension Split on String {
+  /// Splits the string into a list of substrings, each with a maximum length of [length].
+  ///
+  /// This method divides the string into chunks of size [length]. If the string's
+  /// length is not a multiple of [length], the last chunk may be smaller than [length].
+  ///
+  /// - [length]: The number of characters in each part.
+  ///
+  /// Returns a list of substrings where each has a maximum of [length] characters.
+  ///
+  /// Example:
+  /// ```dart
+  /// String text = "DartLang";
+  /// List<String> result = text.splitByLength(3); // ["Dar", "tLa", "ng"]
+  /// ```
+  List<String> splitByLength(int length) {
+    final List<String> parts = [];
+    String string = this;
+
+    while (string.isNotEmpty) {
+      parts.add(string.substring(0, length));
+      string = string.substring(length);
+    }
+    return parts;
+  }
+}
+
+/// An extension on `String` to perform text manipulation tasks.
+extension TextManipulation on String {
+  /// Capitalizes the first letter of the string.
+  ///
+  /// This method returns a new string where the first character is converted
+  /// to uppercase, while the rest of the string remains unchanged.
+  ///
+  /// Example:
+  /// ```dart
+  /// String text = "hello";
+  /// String capitalized = text.capitalize; // "Hello"
+  /// ```
+  String get capitalize {
+    if (isEmpty) return "";
+    return "${this[0].toUpperCase()}${substring(1)}";
+  }
+}