CaiJingLong

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

import 'dart:math';

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

class MyApp extends StatelessWidget {
  // This widget is the root of your application.
  @override

CaiJingLong

typedef void ForEachHandle<T>(int index, T item);

extension _A<T> on List<T> {
  void forEachIndexed(void func(int index, T item)) {
    for (var i = 0; i < this.length; i++) {
      func(i, this[i]);
    }
  }

  void forEachIndexed2(void Function(int index, T item) func) {

CaiJingLong

package top.kikt.imagescanner.util


import android.os.Handler
import android.os.Looper
import io.flutter.plugin.common.MethodChannel

class ResultHandler(var result: MethodChannel.Result?) {

    companion object {

CaiJingLong

void main() {
  print(range(100, start: 1, step: 7));
}

Iterable<int> range(int end, {int start = 0, int step = 1}) sync* {
  assert(step >= 1);
  int r = start;

  while (r < end) {
    yield r;

CaiJingLong

import 'package:flutter/material.dart';

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

class MyApp extends StatelessWidget {
  // This widget is the root of your application.
  @override
  Widget build(BuildContext context) {
    return MaterialApp(
      title: 'Flutter Demo',

CaiJingLong

main(List<String> arguments) {
  final r = RegExp(r'\s(@(\S+))');
  final str = '@abc adkj  sfksjdlfj@@@fjdlksjf @abc@aa df  @@@ccc @dfj @你好';
  final matches = r.allMatches(" " + str);
  for (final match in matches) {
    //    print(match.group(1)); // 带@符号的
    print(match.group(2)); // 不带@符号的
  }
}

CaiJingLong

// ==UserScript==
// @name         Shard in dartpad
// @namespace    http://tampermonkey.net/
// @version      0.1
// @description  try to take over the world!
// @author       Caijinglong
// @match        https://dartpad.cn/*
// @match        https://dartpad.dev/*
// @grant        none
// @require      https://code.jquery.com/jquery-3.4.1.min.js

CaiJingLong

#!/bin/bash

NDK=/Volumes/Samsung-T5/sdk/android-ndk-r21b
TOOLCHAIN=$NDK/toolchains/llvm/prebuilt/darwin-x86_64
API=21

function build_android() {
    cd ffmpeg-4.3.1
    echo "Compiling FFmpeg for $CPU"
    ./configure \

CaiJingLong

buildscript {
    ext.kotlin_version = '1.3.50'
    repositories {
        maven{
            url 'https://maven.aliyun.com/repository/google'
        }
        maven{
            url 'https://maven.aliyun.com/repository/jcenter'
        }
    }

CaiJingLong

import android.os.Handler
import android.os.Looper
import io.flutter.plugin.common.MethodCall
import io.flutter.plugin.common.MethodChannel
import java.util.concurrent.locks.ReentrantLock
import kotlin.concurrent.withLock

/// create 2019-11-27 by cai
class ReplyHandler(val call: MethodCall, private val result: MethodChannel.Result?) {