Create prefer-iterable-in-flutter.dart

tipsandtricks/prefer-iterable-in-flutter/prefer-iterable-in-flutter.dart

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+
+Future<int> doHeavyComputation(int index) => Future.delayed(
+      const Duration(seconds: 1),
+      () {
+        'Iteration ${index + 1}'.log();
+        return index;
+      },
+    );
+
+Future<void> testIt() async {
+  for (final future in Iterable.generate(10)
+      .map(
+        (index) => doHeavyComputation(
+          index,
+        ),
+      )
+      .take(2)) {
+    final result = await future;
+    result.log();
+  }
+}