Add implementations of BLE controller

q&d

1 files changed, 9 insertions, 0 deletions

diff --git a/lib/first_where_ext.dart b/lib/first_where_ext.dart
new file mode 100644
index 0000000..7e297ff
--- /dev/null
+++ b/lib/first_where_ext.dart
@@ -0,0 +1,9 @@
+extension FirstWhereExt<T> on List<T> {
+  /// The first element satisfying [test], or `null` if there are none.
+  T? firstWhereOrNull(bool Function(T element) test) {
+    for (final element in this) {
+      if (test(element)) return element;
+    }
+    return null;
+  }
+}