Sasha Isaienko s0nerik

🎯

Building stuff

s0nerik / main.dart

Created March 20, 2025 23:53

Flutter widget rebuilds: const vs cached instance vs no caching

	import 'package:flutter/material.dart';
	import 'package:flutter/scheduler.dart';

	void main() => runApp(const MyApp());

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

	@override
	Widget build(BuildContext context) {

s0nerik / main.dart

Created October 25, 2023 12:26

Counter example

	// Copyright (c) 2019, the Dart project authors. Please see the AUTHORS file
	// for details. All rights reserved. Use of this source code is governed by a
	// BSD-style license that can be found in the LICENSE file.

	import 'package:flutter/material.dart';
	import 'dart:async';

	void main() => runApp(MyApp());

	class MyApp extends StatelessWidget {

s0nerik / main.dart

Last active September 27, 2023 09:07

(Dart) FutureOr handling differences

	import 'dart:async';

	/// Produces the following output (since [futureOrResult] value is available synchronously):
	/// ```
	/// process: 0
	/// result: 0
	/// process: 1
	/// ```
	Future<void> main() async {
	unawaited(process());

s0nerik / main.dart

Created September 21, 2022 10:27

amber-fauna-4028

	void main() {
	print(DateTime.now());
	print(DateTime.now().toUtc());
	print(DateTime.now().difference(DateTime.now().toUtc()));
	}

s0nerik / main.dart

Last active October 28, 2021 21:17

Dart: Future<void> vs void execution

s0nerik / main.dart

Created October 21, 2021 09:59

UseCase specification comparison (class vs function, explicit vs implicit deps)

	void main() {
	final di = DIContainer();

	final quarterExpenses1 = di.getComputeQuarterExpensesUseCase().perform(100000);
	print(quarterExpenses1);
	final quarterExpenses2 = di.getComputeQuarterExpensesUseCaseFunction()(100000);
	print(quarterExpenses2);
	final quarterExpenses3 = di.getExplicitComputeQuarterExpensesUseCaseFunction()(100000);
	print(quarterExpenses3);
	}

s0nerik / main.dart

Created October 18, 2021 11:23

Dart async error catch example (CORRECT, actually captures the expection)

	Future<void> main() async {
	await test();
	}

	Future<void> test() async {
	try {
	return await errorGenerator();
	} catch (e) {
	print('!!!CAPTURED ERROR!!!');
	} finally {

s0nerik / main.dart

Created October 18, 2021 11:23

Dart async error catch example (WRONG, doesn't capture expection)

s0nerik / main.dart

Last active October 4, 2021 12:25

Figma line height vs Flutter's TextStyle height illustration

	import 'package:flutter/material.dart';

	void main() => runApp(MyApp());

	const lineHeight = 27.0;

	class MyApp extends StatelessWidget {
	@override
	Widget build(BuildContext context) {
	return MaterialApp(

s0nerik / enum_mapper.dart

Last active July 17, 2021 13:12

Two way enum mapper

	typedef EnumMapperCallback<T, E> = T Function(E value);

	class EnumMapper<E, T> {
	EnumMapper(List<E> enumValues, EnumMapperCallback<T, E> mapper) {
	for (final enumValue in enumValues) {
	final key = enumValue;
	final value = mapper(enumValue);
	_forwardMap[key] = value;
	_inverseMap[value] = key;
	}