投稿時間:2021-12-06 06:19:50 RSSフィード2021-12-06 06:00 分まとめ(24件)

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TECH	Engadget Japanese	『フォートナイト』チャプター3開始。スパイダーマンやドウェイン・ジョンソンなどが登場	https://japanese.engadget.com/fortnite-chapter-3-205042615.html	flipped	2021-12-05 20:50:42
TECH	Engadget Japanese	2019年12月6日、ポータブル翻訳機「ワールドスピーク HYP10」が発売されました：今日は何の日？	https://japanese.engadget.com/today-203033089.html	翻訳機	2021-12-05 20:30:33
Program	[全てのタグ]の新着質問一覧｜teratail（テラテイル）	プログラミングをしている人の手助け	https://teratail.com/questions/372431?rss=all	プログラミングをしている人の手助け前提・実現したいことここに質問の内容を詳しく書いてください。	2021-12-06 05:51:21
Program	[全てのタグ]の新着質問一覧｜teratail（テラテイル）	raise Error(response.error) slacker.Error: method_deprecatedを解決する方法を教えてください。	https://teratail.com/questions/372430?rss=all	raiseErrorresponseerrorslackerErrormethoddeprecatedを解決する方法を教えてください。	2021-12-06 05:50:23
Program	[全てのタグ]の新着質問一覧｜teratail（テラテイル）	ファイルはあるのに開けない	https://teratail.com/questions/372429?rss=all	chmod	2021-12-06 05:44:26
Program	[全てのタグ]の新着質問一覧｜teratail（テラテイル）	ImportError: cannot import name 'Bot' from 'slackbot' の解決方法を教えてください。【Python3.x】	https://teratail.com/questions/372428?rss=all	ImportErrorcannotimportnamexBotxfromxslackbotxの解決方法を教えてください。	2021-12-06 05:01:56
海外TECH	Ars Technica	ESA head says Europe needs to stop facilitating Elon Musk’s ambitions in space	https://arstechnica.com/?p=1818165	earth	2021-12-05 20:29:40
海外TECH	MakeUseOf	How to Refresh Windows 11	https://www.makeuseof.com/windows-11-refresh/	windows	2021-12-05 20:16:21
海外TECH	DEV Community	A Story Of React Effects.	https://dev.to/alimobasheri/a-story-of-react-effects-4dia	A Story Of React Effects We use states to update what components render But what if some operations don t cause immediate changes in the component s output The React documentation calls them side effects And some examples include using web APIs handling HTTP requests and attaching listeners to events For handling these React provides us with the useEffect hook It calls the function you pass it each time the component renders or updates Through this article we ll learn why React implements this functionality And when you finish reading this you can start to use effects to your profit Side effectsEvery action ends in an outcome And every component renders an output To lose weight you need to burn fat It s possible by going on a diet and beginning exercises But get ready for the side effects These side effects include headaches fatigue and dizziness They are so because they are not what you expect Neither are they a part of the main routine When exercising exhausts you you need to rest for a while You need to gain energy before you can return to your everyday life In a React app when requesting data from the server we can face the same problem Because we re not sure how long it can take to retrieve the data from the server And we re not sure if we can render it in the component s output So we call the useEffect hook to start fetching the needed data from the server In the meanwhile the component renders a placeholder output You know what it is A beautiful loading indicator The useEffect HookFrom the React documentation By using this Hook you tell React that your component needs to do something after render React will remember the function you passed we ll refer to it as our “effect and call it later after performing the DOM updates So you pass a function to useEffect and it remembers to call it after each render or update This means that by the time the component calls your effect it has already updated the state And the browser has finished painting the screen But why do we need to wait for the render to finish before running the effect We can find the answer The variety of side effectThink of a big drapery shop Full of luxurious and colorful textiles Rows over rows of fabrics Silks from all over the world A great show of human creativity Now imagine the customers A market welcomed by women Waves of them coming to the store and leaving hourly Think of how the owners can manage the purchases and the sales Then there s one special case One of the customers a young blonde lady is looking for a rare type of silk It was in stock three days ago But now all of it was sold out So the salesman takes the lady s phone number Then he makes phone calls with some well known silk traders to order a new set of that special silk In the end he informs the lady that he ll call her later as soon as the product is available And let s hope he doesn t text her How you doin A drapery shop could run out of any of its products at any time Do you think the manager should not open his store if some of his assets are missing Does the above question make any sense to you By waiting for the perfect time he may not as well make more than ten sales per week A React component is like this drapery shop It renders what it has in stock And if data isn t currently available in the state it renders a loading indicator Then tries to fetch the data in a useEffect hook A code example looks as following const Drapery props gt const isLoading setIsLoading useState true const data setData useState null useEffect gt fetch then res gt res json then data gt setData data setIsLoading false catch error gt console log There was an error while fetching data error return isLoading lt Spinner gt lt ListComponent data data gt This code renders a component with two states One of them is loading In case its value is true it means data isn t available So the component should render a loading indicator The other one is data which holds a list of drapery items And ListComponent is going to render them We should focus on the useEffect part The hook accepts two arguments a function and a dependency array The function holds the logic of your effect Using the dependency array you pass a set of values that React will start to track Anytime any of the values in this array changes React calls your effect In this case we ve passed an empty array as a dependency This indicates that React calls this effect only once That is after the initial render If you pass no dependency array to the hook React calls the effect after each render or update The function we passed to useEffect tries to start fetching data from the server JS fetch API returns a promise We use it to update the states as soon as we get the response We update the data state with what we get from the server Then we set the loading state to false Then the condition in our component s return expression evaluates to false That s when it renders the data using ListComponent While our effect causes a re render by updating states it doesn t affect the render It runs in parallel And it never causes any direct changes in what the component renders In the previous section we had a question Why should effects run after the render is updated In this case a good reason is that network calls can affect the client s performance We need to show the loading indicator as soon as possible In web apps each second lost due to performance is thousands of potential users lost forever How much did we make today A drapery shop s manager needs to keep its daily sales data in a secure place He needs to have a record of everything they buy and sell daily They save pieces of information on every new asset they deliver and sell daily They should do it as soon as any change occurs While writing React web apps we sometimes need to save the user s data in the client s storage The localStorage API is a good option for this case We can use the useEffect hook to listen to changes in state as soon as it is updated Then we can set a JSON clone of the new state in the client s storage An example const UserContext createContext const UserProvider children gt const user setUser useState null useEffect gt const persistedUserData localStorage getItem user if persistedUserData setUser JSON parse persistedUserData useEffect gt const jsonUserData JSON stringify user localStorage setItem user jsonUserData user return lt UserContext Provider value user gt children lt UserContext Provider gt In the above example we are using React createContext to initialize a context If you don t know about context you can think of it as an API It makes the value you pass to its Provider available to every component in its tree To learn more you can read the documentation Then in the body of the Provider we have used three hooks One is a useState which holds user info Its initial value is null which means no user data is available The two other hooks are both useEffects The first effect runs only after the first render as its dependency array is empty We use it to check if there s any user data previously stored in the client s storage If so we parse the JSON data as a JS object and update our state with it The second hook has a dependency array with one element user state value So it will run every time we update the user state This effect makes a JSON copy of the user state and saves it to the client s localStorage The second useEffect is a good example of when we should use effects We update the client s localStorage which causes no change in the render There s no place for its logic in the component body We ve also learned how we can control when effects are run by setting their dependency arrays Good Did a fire catch here Silks clothes curtains They re all so soft and lovely Yet they re so vulnerable to ignition A small flame can turn the whole drapery into ashes Piles of money into ash that is A drapery shop s manager is aware of this hazard and takes every precaution step needed to prevent its occurrence But there s always a chance of a mistake And a mistake is enough to undo all the cautions So he has specified an explicit procedure for when fire catches in the store And he has instructed it to his employees In addition he has printed them on paper and stuck them on the wall There s little chance of things going wrong but it might happen at any time And he needs to bear it in mind Do you need a similar web app example A text editor is one When working with a text editor you need to save your changes to not lose them when you reopen the text Now there s a chance you forget you haven t saved your changes and click the browser s close button A good web application is going to prevent this disaster happen It stops the navigator from closing the tab and alerts you that you haven t saved your work Sir or madam truly your forgiveness I implore are you sure you want to continue To implement this feature in a React app we can do it with useEffect like the example below const Editor props gt useEffect gt window addEventListener beforeunload showDialog return gt window removeEventListener beforeunload return lt EditorPanel gt In the above example we attach a listener to window s beforeunload event This event is fired whenever the user tries to close the browser or the current tab The useEffect hook is a good choice in this case because the component is already rendered Then we re sure that the window object is loaded and we can attach an event listener to it Also we ve used a return statement in the useEffect hook You can always return a function in your effect React will call this function when the component is unmounted We returned a function that removes the event listener attached to the window because we don t want to prevent the user from exiting the app when there is no editor open A function you return in your effects is called cleanup function Since effects like this listener are out of the component s scope and are not related to its render it s always a good idea to write a cleanup function for them When a drapery shop s manager goes broke and has to leave his place he also has to clean the wall from his emergency instructions The new manager won t like to see them there That s it In this article we learned why we need to separate effect logic from render and how to do it wisely We also learned different use cases of this feature and how to handle them correctly I hope you liked it One last word If you were in doubt whether you should write an effect or just bring the logic inside the component s body ask yourself this question Is the operation immediately going to change what the component renders In case this article was of any help to you I will be glad if you follow me on Twitter or mention me in an appreciation tweet That means a lot to me MobasheriMirali	2021-12-05 20:36:32
Apple	AppleInsider - Frontpage News	Apple fighting Russia over alternative App Store payments	https://appleinsider.com/articles/21/12/05/apple-takes-on-russian-regulator-in-court-over-app-store-warning?utm_medium=rss	Apple fighting Russia over alternative App Store paymentsApple is going to court against the Russian Federal Antimonopoly Service over a demand by the regulator to stop Apple s App Store payment policies The lawsuit concerns a warning given by FAS in August telling the iPhone maker to let app developers advise to users about alternative ways to pay instead of using Apple s in app purchases system At the time FAS gave Apple until September to comply or face a potential penalty based on its revenue in Russia In October the regulator then launched an antitrust lawsuit against Apple for non compliance However FAS did so only a few days after Apple altered its developer guidelines to loosen its anti steering provisions a move that theoretically could have brought Apple into compliance albeit later than demanded Read more	2021-12-05 20:58:55
海外TECH	Engadget	Apple takes Russia to court over App Store ruling	https://www.engadget.com/apple-fights-russia-app-store-ruling-205651016.html?src=rss	Apple takes Russia to court over App Store rulingApple is still fighting Russia over alleged App Store abuse Both toMac and RT report Apple is asking for a judicial review of a Federal Antimonopoly Service warning from August that allows developers to mention alternatives to the App Store s in app payment system FAS gave Apple until September th to alter its policies but the company declined to change its rules despite the threat of a fine The opposition parallels Apple s legal battles in the US The judge in Epic s lawsuit against Apple ordered the tech firm to let App Store developers point to other payment systems but Apple appealed the injunction in hopes of a delay The court denied Apple s request and the company will have until December th to let app makers point to other options Apple will make exceptions to its policy for some media apps in Pushbacks like those in the US and Russia aren t surprising Apple still makes most of its money through hardware sales but its services business is growing Easier third party alternatives could theoretically hurt App Store revenues not to mention increase the chances of rogue apps pointing users to malicious sites The iPhone maker might not have much choice however Regulators are concerned Apple s approach stifles choice and competition and they re unlikely to let the matter slide	2021-12-05 20:56:51
ニュース	BBC News - Home	Indonesia volcano: Villages buried under hot ash	https://www.bbc.co.uk/news/world-asia-59543120?at_medium=RSS&at_campaign=KARANGA	ashrescuers	2021-12-05 20:46:20
ニュース	BBC News - Home	Konsa scores twice as Villa come from behind to beat Leicester	https://www.bbc.co.uk/sport/football/59380837?at_medium=RSS&at_campaign=KARANGA	villa	2021-12-05 20:21:38
ビジネス	ダイヤモンド・オンライン - 新着記事	滴滴のUターン、一時代の終わり象徴 - WSJ発	https://diamond.jp/articles/-/289683	象徴	2021-12-06 05:28:00
ビジネス	ダイヤモンド・オンライン - 新着記事	みずほ10年改革に“2つの大誤算”、「言われたことしかしない」と金融庁に皮肉られた真の理由 - みずほ 退場宣告	https://diamond.jp/articles/-/289235	みずほ年改革に“つの大誤算、「言われたことしかしない」と金融庁に皮肉られた真の理由みずほ退場宣告かつて度の大規模システム障害を起こし、反社会的勢力との取引でも大混乱に陥ったみずほ。	2021-12-06 05:25:00
ビジネス	ダイヤモンド・オンライン - 新着記事	スタグフレーションに「使い古しの政策」は通用しない - 政策・マーケットラボ	https://diamond.jp/articles/-/289403	一時しのぎ	2021-12-06 05:20:00
ビジネス	ダイヤモンド・オンライン - 新着記事	レーザーテックが、絶好調の半導体業界で唯一3割減収に陥った「特殊事情」 - ダイヤモンド 決算報	https://diamond.jp/articles/-/289371		2021-12-06 05:15:00
ビジネス	ダイヤモンド・オンライン - 新着記事	清水建設の日テレ「イッテQ」CM撤退説に透ける、マスコミ不動産開発とゼネコンの関係 - ゼネコン 地縁・血縁・腐れ縁	https://diamond.jp/articles/-/288616	不動産開発	2021-12-06 05:10:00
ビジネス	ダイヤモンド・オンライン - 新着記事	年収アップには「正攻法」がある！給与大幅アップのオファーを警戒すべき理由 - 転職で幸せになる人、不幸になる人　丸山貴宏	https://diamond.jp/articles/-/289535	大幅アップ	2021-12-06 05:05:00
ビジネス	電通報 | 広告業界動向とマーケティングのコラム・ニュース	DOOHの新潮流～エレベーター・サイネージ編	https://dentsu-ho.com/articles/7995	doohdigitaloutofhome	2021-12-06 06:00:00
ビジネス	電通報 | 広告業界動向とマーケティングのコラム・ニュース	経営戦略から見たクリエイティブ	https://dentsu-ho.com/articles/7981	広告表現	2021-12-06 06:00:00
北海道	北海道新聞	政府賃上げ方針　継続的な財源の議論を	https://www.hokkaido-np.co.jp/article/619433/	賃金	2021-12-06 05:01:00
ビジネス	東洋経済オンライン	70歳実質定年で差が開く､シニアの勝ち組･負け組 40代から意識せざるをえない｢老後のリアル｣ | 最新の週刊東洋経済 | 東洋経済オンライン	https://toyokeizai.net/articles/-/473598?utm_source=rss&utm_medium=http&utm_campaign=link_back	東洋経済オンライン	2021-12-06 05:30:00
海外TECH	reddit	Hamilton summoned for incident at turn 27	https://www.reddit.com/r/formula1/comments/r9oemt/hamilton_summoned_for_incident_at_turn_27/	Hamilton summoned for incident at turn submitted by u Noisyrussinators to r formula link comments	2021-12-05 20:20:33