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data class RepositoryItem<T>(
    val value: T,
    val status: Adding | AddingFailed | Added | Removing | RemovingFailed
    
    override fun equals(other: RepositoryItem<T>) {
        return value == other.value
    }
)

interface ListRepository<T> {

seanwu1105

RxJS WTF

tap(_ => func()) != mapTo(func())

Assume func is a synchronized function. tap(_ => func()) will call the function lazily. However, mapTo(func()) will call the function eagerly.

forkJoin

• forkJoin will not emit anything if the input is an empty array.
• forkJoin only emit one value than complete.

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{
    "$schema": "http://json-schema.org/draft-07/schema",
    "type": "object",
    "description": "Assertion provided by Starling Capture.",
    "examples": [
        {
            "proof": {
                "hash": "b08714406df079733fdbc0566aa28ff4b20abd13e3a2042ddd214bc4d4f81f7c",
                "mimeType": "image/jpeg",
                "timestamp": 1600177819743

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{
    "$schema": "http://json-schema.org/draft-07/schema",
    "type": "object",
    "description": "Assertion provided by Starling Capture.",
    "examples": [
        {
            "device_board": "sdm845",
            "device_brand": "htc",
            "current_address": "No. 77, Jinshan North Road, Zhongzheng District, Taipei City, Taiwan 100",
            "current_gps_latitude": "25.045234",

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FROM ubuntu:latest

SHELL ["/bin/bash", "-c"]

RUN apt-get update && \
  apt-get install -y \
  git \
  build-essential \
  wget

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Install macOS with Virtual Box in Ubuntu

Install Virtual Box 6.x

Download and install Virtual Box 6.x from the website.

Deal with Annoying Secure Boot

You have 2 options: disable secure boot or sign the kernel modules. We only mention how to sign kernel modules without disabling secure boot.

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Change Timestamps in Windows

Get Started

Open PowerShell

Open PowerShell in the target directory. Normally, you can open PowerShell in current directory by holding shift and right-clicking the context menu Open PowerShell Here.

Use the Following Commands

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import timeit
import collections
import itertools

import numpy as np
from bitarray import bitarray as b


def test_slice(data):
    for i in reversed(range(len(data))):

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import sys

from PyQt5.QtCore import QThread
from PyQt5.QtWidgets import (QApplication, QMainWindow, QPushButton,
                             QComboBox, QWidget, QVBoxLayout)


class Task(QThread):
    def run(self):
        print('task started')

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import scrapy


class ArticlesListSpider(scrapy.Spider):
    name = "articles_list"
    page_counter = 0

    def start_requests(self):
        urls = [
            r'https://zh.wikipedia.org/wiki/Special:%E6%89%80%E6%9C%89%E9%A1%B5%E9%9D%A2'