Add String.removePrefix()

luiz158 · Jun 28, 2020 · e2afa58 · e2afa58
1 parent 314d2eb
commit e2afa58
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diff --git a/lib/src/string.dart b/lib/src/string.dart
@@ -152,4 +152,14 @@ extension StringX on String {
   }
 
   bool get isNotNullOrEmpty => !this.isNullOrEmpty;
+
+  /// TODO: docs
+  String removePrefix(String prefix) {
+    if (startsWith(prefix)) {
+      return substring(prefix.length, length);
+    } else {
+      return this;
+    }
+  }
+
 }
diff --git a/test/string_test.dart b/test/string_test.dart
@@ -149,5 +149,16 @@ void main() {
               .md5,
           '57edf4a22be3c955ac49da2e2107b67a');
     });
+
+    test('.removePrefix()', () {
+      expect('abc def ghi'.removePrefix('abc'), ' def ghi');
+      expect(' abc def ghi'.removePrefix('abc'), ' abc def ghi');
+      expect('12345'.removePrefix('123456'), '12345');
+      expect('text'.removePrefix(''), 'text');
+      expect('🎉🌟'.removePrefix('🎉'), '🌟');
+
+      final expected = 'sameInstance';
+      expect(expected.removePrefix(''), same(expected));
+    });
   });
 }