onSubmitted: func vs () => func()

readme.md

onSubmitted: func vs () => func()

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main.dart

import 'package:flutter/material.dart';

void main() {
  runApp(const MyApp());
}

class MyApp extends StatelessWidget {
  const MyApp({super.key});

  @override
  Widget build(BuildContext context) {
    return MaterialApp(
      theme: ThemeData.dark(),
      debugShowCheckedModeBanner: false,
      home: Scaffold(
        appBar: AppBar(
          title: const Text("Func vs () => func"),
        ),
        body: const Center(
          child: Padding(
            padding: EdgeInsets.symmetric(horizontal: 20),
            child: SearchBar(),
          ),
        ),
      ),
    );
  }
}

class SearchBar extends StatelessWidget {
  const SearchBar({super.key});

  @override
  Widget build(BuildContext context) {
    return TextField(
      decoration: const InputDecoration(
        border: OutlineInputBorder(),
      ),
      //onSubmitted: onSubmit,                   // Option A works
      onSubmitted: (value) => onSubmit           // Option B doesn't
      //onSubmitted: (value) => onSubmit(value), // Option C works
    );
  }
  

  onSubmit(value) => print(value);
  //try assign onSubmitted: onSubmitNoParam, and see the error
  onSubmitNoParam() => print("Printed!");
}