Add string comparisons

sugar/CHANGELOG.md

@@ -1,4 +1,4 @@
-## 3.2.0 (Next)
+## 4.0.0 (Next)
 
 ## `sugar.collection`
 - Add `Lists.toggleAll(...)`
@@ -8,7 +8,7 @@
 - Add `System.epochMilliseconds`
 - Add `System.epochMicroseconds`
 - **Breaking** - Change `Runtime` to `System` 
-- Deprecate `Maybe` extension for removal in Sugar 3.3.0.
+- **Breaking** - Remove `Maybe` extension.
 - Remove `Iterables.indexed` since it already exists in Dart 3.
 
 ## `sugar.time`

sugar/lib/core.dart

@@ -69,7 +69,6 @@ export 'src/core/comparables.dart';
 export 'src/core/disposable.dart';
 export 'src/core/equality.dart';
 export 'src/core/functions.dart';
-export 'src/core/maybe.dart';
 export 'src/core/result.dart';
 export 'src/core/string_buffers.dart';
 export 'src/core/strings.dart';

sugar/lib/src/core/strings.dart

@@ -408,4 +408,81 @@ extension Strings on String {
   /// See [isBlank].
   @useResult bool get isNotBlank => trim().isNotEmpty;
 
+
+  /// Returns whether this string is lexicographically less than [other].
+  ///
+  /// If one string is a prefix of the other, then the shorter string is less than the longer string. This function does
+  /// not check for Unicode equivalence and is case sensitive.
+  ///
+  /// ```dart
+  /// 'A' < 'B'; // true
+  /// 'B < A'; // false
+  ///
+  /// 'A' < 'A'; // false
+  ///
+  /// 'A' < 'Apple'; // true
+  /// 'Apple' < 'A'; // false
+  ///
+  /// 'a' < 'A'; // true
+  /// 'A' < 'a'; // false
+  /// ```
+  bool operator < (String other) => compareTo(other) < 0;
+
+  /// Returns whether this string is lexicographically less than or equal to [other].
+  ///
+  /// If one string is a prefix of the other, then the shorter string is less than the longer string. This function does
+  /// not check for Unicode equivalence and is case sensitive.
+  ///
+  /// ```dart
+  /// 'A' <= 'B'; // true
+  /// 'B <= A'; // false
+  ///
+  /// 'A' <= 'A'; // true
+  ///
+  /// 'A' <= 'Apple'; // true
+  /// 'Apple' <= 'A'; // false
+  ///
+  /// 'a' <= 'A'; // true
+  /// 'A' <= 'a'; // false
+  /// ```
+  bool operator <= (String other) => compareTo(other) <= 0;
+
+  /// Returns whether this string is lexicographically greater than [other].
+  ///
+  /// If one string is a prefix of the other, then the larger string is greater than the shorter string. This function
+  /// does not check for Unicode equivalence and is case sensitive.
+  ///
+  /// ```dart
+  /// 'B > A'; // true
+  /// 'A' > 'B'; // false
+  ///
+  /// 'A' > 'A'; // false
+  ///
+  /// 'Apple' > 'A'; // true
+  /// 'A' > 'Apple'; // false
+  ///
+  /// 'A' > 'a'; // true
+  /// 'a' > 'A'; // false
+  /// ```
+  bool operator > (String other) => compareTo(other) > 0;
+
+  /// Returns whether this string is lexicographically greater than or equal to [other].
+  ///
+  /// If one string is a prefix of the other, then the larger string is greater than the shorter string. This function
+  /// does not check for Unicode equivalence and is case sensitive.
+  ///
+  /// ```dart
+  /// 'B >= A'; // true
+  /// 'A' >= 'B'; // false
+  ///
+  /// 'A' >= 'A'; // true
+  ///
+  /// 'Apple' >= 'A'; // true
+  /// 'A' >= 'Apple'; // false
+  ///
+  /// 'A' >= 'a'; // true
+  /// 'a' >= 'A'; // false
+  /// ```
+  bool operator >= (String other) => compareTo(other) >= 0;
+
 }