Add buildString() and .toChar() function

luiz158 · Nov 3, 2021 · b5af19f · b5af19f
1 parent 4dca258
commit b5af19f
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Showing 4 changed files with 32 additions and 0 deletions.
diff --git a/lib/src/num.dart b/lib/src/num.dart
@@ -83,3 +83,8 @@ extension DoubleToBytesExtension<T extends double> on T {
     return data.buffer.asUint8List();
   }
 }
+
+extension IntToCharExtension<T extends int> on T {
+  /// Converts this [int] value to character.
+  String toChar() => String.fromCharCode(this);
+}
diff --git a/lib/src/string.dart b/lib/src/string.dart
@@ -266,3 +266,11 @@ extension NullableStringIsNotNullOrEmptyExtension on String? {
   /// Returns `true` if the string is neither null nor empty.
   bool get isNotNullOrEmpty => !isNullOrEmpty;
 }
+
+/// Builds new string by populating newly created [StringBuffer] using provided [builderAction]
+/// and then converting it to [String].
+String buildString(void Function(StringBuffer it) builderAction) {
+  final buffer = StringBuffer();
+  builderAction(buffer);
+  return buffer.toString();
+}
diff --git a/test/num_test.dart b/test/num_test.dart
@@ -83,6 +83,12 @@ void main() {
         Uint8List.fromList([21, 205, 91, 7, 0, 0, 0, 0]),
       );
     });
+
+    test('.toChar()', () {
+      expect(97.toChar(), 'a');
+      expect(65.toChar(), 'A');
+      expect(37.toChar(), '%');
+    });
   });
 
   group('DoubleX', () {

diff --git a/test/string_test.dart b/test/string_test.dart
@@ -270,5 +270,18 @@ void main() {
       expect(() => 'awesomeString'.slice(-14), throwsRangeError);
       expect(() => 'awesomeString'.slice(-1, -2), throwsRangeError);
     });
+
+    test('buildString()', () {
+      expect(buildString((it) => it.write('test')), 'test');
+
+      expect(
+        buildString((it) {
+          for (var i = 0; i < 10; i++) {
+            it.write(i);
+          }
+        }),
+        '0123456789',
+      );
+    });
   });
 }