yongjhih

abstract class Preference<T> {
  String get key;

  T? get value;
  set value(T? newValue);

  T? get();
  Future<bool> set(T? newValue);

  Future<bool> remove();

yongjhih

extension FutureZipX<T> on Future<T> {
  Future<(T, T2)> zipWith<T2>(Future<T2> future2) async {
    late T result1;
    late T2 result2;
    await Future.wait(
        [then((it) => result1 = it), future2.then((it) => result2 = it)]);
    return (result1, result2);
  }
}

yongjhih

fun <T: Any> byAtomic(initialValue: T) = object : ReadWriteProperty<Any?, T> {
    val ref = AtomicReference(initialValue)
    override fun getValue(thisRef: Any?, property: KProperty<*>): T = ref.get()
    override fun setValue(thisRef: Any?, property: KProperty<*>, value: T) = ref.set(value)
}

fun <T: Any?> byAtomic(initialValue: T? = null) = object : ReadWriteProperty<Any?, T?> {
    val ref = AtomicReference<T?>(initialValue)
    override fun getValue(thisRef: Any?, property: KProperty<*>): T? = ref.get()
    override fun setValue(thisRef: Any?, property: KProperty<*>, value: T?) = ref.set(value)

yongjhih

import 'dart:async';
import 'dart:convert';
import 'package:http/http.dart' as http;

Stream<Iterable<Map<String, dynamic>?>?> fetchGitHubRepos(String? url) async* {
  while (url != null) {
    print("$url");
    final response = await http.get(Uri.parse(url));

    if (response.statusCode == 200) {

yongjhih

        /// Weights of [0,0] anchor:
        ///     | j j j j j
        ///     | 0 1 2 3 4
        /// ----+-----------
        /// i 0 | 0 1 2 3 4
        /// i 1 | 1 2 2 3 4
        /// i 2 | 2 2 3 3 4
        /// i 3 | 3 3 3 4 4
        /// i 4 | 4 4 4 4 5
        ///

yongjhih

        const Generator = Object.getPrototypeOf(function* () { });
        Generator.prototype.map = function* (mapper) {
            for (const it of this) {
                yield mapper(it);
            }
        };
        Generator.prototype.filter = function* (predicate) {
            for (const it of this) {
                if (predicate(it)) yield it;
            }

yongjhih

        ///     | j j j j j
        ///     | 0 1 2 3 4 < j-index
        /// ----+----------- round-th
        /// i 0 | 0 1 2 3 4  round-0: [0,0]
        /// i 1 | 1 2 3 4 5  round-1: [0,1][1,0]
        /// i 2 | 2 3 4 5 6  round-2: [0,2][1,1][2,0]
        /// i 3 | 3 4 5 6 7  round-3: [0,3][1,2][2,1][3,0]
        /// i 4 | 4 5 6 7 8  round-4: [0,4][1,3][2,2][3,1][4,0]
        ///                  round-5:      [1,4][2,3][3,2][4,1]
        ///                  round-6:           [2,4][3,3][4,2]

yongjhih

/// For dart 2:
///
/// ```
/// import 'package:tuple/tuple.dart';
///
/// Future<Tuple2<T1, T2>> zipAsync<T1, T2>(
///     Future<T1> future1, Future<T2> future2) async {
///   late T1 result1;
///   late T2 result2;
///

yongjhih

/**
 * Compatibility
 *
 * See Also: androidx.core.content.res.use
 */
@OptIn(ExperimentalContracts::class)
inline fun <T: TypedArray, R> T.use(block: (T) -> R): R {
    contract {
        callsInPlace(block, InvocationKind.EXACTLY_ONCE)
    }

yongjhih

class Post {
  final String? content;
  const Post([this.content]);
}

class UserProfile {
  final List<Post> posts;
  final int followersCount;

  const UserProfile(this.posts, this.followersCount);