tweaks

Signed-off-by: bggRGjQaUbCoE <githubaccount56556@proton.me>

lib/utils/extension/iterable_ext.dart

@@ -0,0 +1,46 @@
+extension NullableIterableExt<T> on Iterable<T>? {
+  bool get isNullOrEmpty => this == null || this!.isEmpty;
+}
+
+extension IterableExt<T> on Iterable<T> {
+  T? reduceOrNull(T Function(T value, T element) combine) {
+    Iterator<T> iterator = this.iterator;
+    if (!iterator.moveNext()) {
+      return null;
+    }
+    T value = iterator.current;
+    while (iterator.moveNext()) {
+      value = combine(value, iterator.current);
+    }
+    return value;
+  }
+}
+
+extension ListExt<T> on List<T> {
+  T? getOrNull(int index) {
+    if (index < 0 || index >= length) {
+      return null;
+    }
+    return this[index];
+  }
+
+  bool removeFirstWhere(bool Function(T) test) {
+    final index = indexWhere(test);
+    if (index != -1) {
+      removeAt(index);
+      return true;
+    }
+    return false;
+  }
+
+  List<R> fromCast<R>() {
+    return List<R>.from(this);
+  }
+
+  T findClosestTarget(
+    bool Function(T) test,
+    T Function(T, T) combine,
+  ) {
+    return where(test).reduceOrNull(combine) ?? reduce(combine);
+  }
+}