投稿時間:2022-02-23 08:36:29 RSSフィード2022-02-23 08:00 分まとめ(43件)

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TECH	Engadget Japanese	美術愛好家のための機械式腕時計。ゴッホ「星月夜」を文字盤に描いたムーンフェイズ腕時計「LaNuEto」	https://japanese.engadget.com/lanuete-watch-223534772.html	文字盤上で変化していく月の表情がロマンティックな魅力を放ち、時計愛好家を惹きつけてきました。	2022-02-22 22:35:34
IT	ITmedia 総合記事一覧	[ITmedia News] Spotify初のハードウェア「Car Thing」、90ドルで発売	https://www.itmedia.co.jp/news/articles/2202/23/news041.html	carthing	2022-02-23 07:25:00
海外TECH	Ars Technica	Chiwetel Ejiofor plays an alien named Faraday in Man Who Fell to Earth trailer	https://arstechnica.com/?p=1835906	earth	2022-02-22 22:49:46
海外TECH	Ars Technica	Missouri governor’s wild claims about journalist debunked in police report	https://arstechnica.com/?p=1835915	contradicts	2022-02-22 22:34:57
海外TECH	Ars Technica	Apple’s AR/VR headset isn’t just a prototype anymore, sources say	https://arstechnica.com/?p=1835894	september	2022-02-22 22:32:46
海外TECH	MakeUseOf	How Twitter’s “Automated” Label Helps You Identify Good Bots	https://www.makeuseof.com/twitters-automated-label-helps-identify-good-bots/	twitter	2022-02-22 22:31:06
海外TECH	MakeUseOf	How to Easily Collaborate on Google Drive With Online Annotations	https://www.makeuseof.com/tag/easily-collaborate-google-drive-online-annotation/	How to Easily Collaborate on Google Drive With Online AnnotationsThere are specialized annotation web apps available that integrate with Google Drive and make communicating with others about your document easier We look at the best annotation tools for Google Drive	2022-02-22 22:30:14
海外TECH	DEV Community	How Does "prevState" Works Under the Hood	https://dev.to/ogzhanolguncu/how-does-prevstate-works-under-the-hood-19kf	How Does quot prevState quot Works Under the HoodWe have always been told to use prevState when dealing with useState but not really why we need it in the first place Today we will deep dive and see how it works under the hood to retrieve the latest state without the need of render cycle render cycle refers to VDOM updates not actual browser refresh But before going forward first we need to see how the real problem occurs when the state is used instead of prevState const counter setCounter useState return lt div className App gt lt div gt Counter counter lt div gt lt button onClick gt setCounter counter setCounter counter setCounter counter gt Click me to increase the counter lt button gt lt div gt In reality this should increase the Counter by six each time we click but it s only taking the last one to account So what s the reasoning behind this Is this working incorrectly or is this the intended behaviour It turns out it s not falsy or incorrect it is working as expected programmatically at least Because for React to access the counter state it should complete its rendering cycle But since we force React to read the counter state before the cycle completion it s only referring to the last one Okay let s see how it behaves when we introduce prevState const counter setCounter useState return lt div className App gt lt div gt Counter counter lt div gt lt button onClick gt setCounter prevState gt prevState setCounter prevState gt prevState setCounter prevState gt prevState gt Click me to increase the counter lt button gt lt div gt Now it s working as we expected But how To answer this question we ll build a simple React clone and see how it internally manages prevState React used to rely on this in class based components but now it s using closures under the hood to manage hooks states Pretty much all of the hooks use closures to access information about previous renders A little recap for closures to not get lost in the following examples ClosuresConsider the following code const add gt let counter return x gt counter x return counter const foo add foo foo Closure functions always hold a reference to an inner variable to keep track of it The inner function is only accessible within the function body and this inner function can access counter at any time So between function calls counter variable will always point to the latest variable state In the example above if we go ahead and use a regular function we would end up with twice but since we keep track of value inside function thanks to closure we keep adding to the accumulated value Now going back to our original example We will build a simple React clone that utilizes closures under the hood to persist states between renders function Counter const count setCount React useState return click gt setCount count render gt console log render count At first glance you are probably saying we need an object with two functions one to take care of useState and another one for our pseudo rendering And definitely a variable to persistthe state const MyReact gt let val null return render Component const Comp Component Comp render return Comp useState initialValue val val initialValue const setState nextState gt val nextState return val setState Let s start with render The render function accepts a component and all it does is invoke the render and return the component for future use because we need to keep its reference Without return Comp we can invoke neither click nor render because it s this function that carries the details about our component The useState is pretty straight forward It takes the default value and assigns it to val but only val is not present Then we have setState to assign new values to our state Finally we return a tuple array with elements const MyReact gt let val null return render Component const Comp Component Comp render return Comp useState initialValue val val initialValue const setState nextState gt val nextState return val setState const React MyReact function Counter const count setCount React useState return click gt setCount count render gt console log render count let App App React render Counter render count App click App click App click App React render Counter render count Now if we run this piece of code it only prints twice because we called render twice that s pretty expected But we clicked three times why did it print count instead of Similar to real React our MyReact is waiting for React to render Without render it cannot process the upcoming state updates Therefore relies on render let App App React render Counter render count App click App React render Counter render count App click App React render Counter render count App click App React render Counter render count If we let it render then it prints correctly So how can we access the val inside MyReact You guessed it right we need to give a callback to setCount and change the useState a bit And if you are worried about callback don t because it s something we already know and use useState initialValue val val initialValue const setState nextState gt val typeof nextState function nextState val nextState Changed this line to accept callbacks return val setState const React MyReact function Counter const count setCount React useState return click gt setCount prevState gt prevState Sending callback to access closure render gt console log render count In setCount all we do is giving an arrow function that accepts a variable and adds to it setCount prevState gt prevState const setState incVal gt val typeof incVal function incVal val incVal We no longer need to rely on render cycles we can directly access the state closure via prevState let App App React render Counter render count App click App React render Counter render count App click App React render Counter render count App click App click App click App React render Counter render count By the way this does not mean we need render anymore Whether you like it or not React keeps rendering but we can always get fresh states during rendering phase instead of stales one Wrapping UpSome of the concepts above might seem vague but in due time with lots of pratice they start become more understandable Important takeaways Functional components use closures under the hood to store states Always rely on prevState to avoid stale states Learning the core concepts of the language will always help to get deeper understanding	2022-02-22 22:02:45
Apple	AppleInsider - Frontpage News	Apple Stores lift mask mandate, plans resumption of in-person Today at Apple	https://appleinsider.com/articles/22/02/22/apple-stores-lift-mask-mandate-plans-resumption-of-in-person-today-at-apple?utm_medium=rss	Apple Stores lift mask mandate plans resumption of in person Today at AppleApple has revoked its mask mandate for customers at most retail locations and is preparing the resumption of in person Today at Apple courses In a report by Bloomberg Apple has lifted its mask mandate for in store shopping for locations in several states across the United States namely the states of Ohio North Carolina Georgia Kansas Kentucky among others As a result masks will be available to customers upon requests in eligible locations The mask mandate remains in effect for locations in states with stricter pandemic guidelines such as Hawaii Read more	2022-02-22 22:57:56
Apple	AppleInsider - Frontpage News	Foiled robbery hostage situation at Amsterdam Apple Store is over	https://appleinsider.com/articles/22/02/22/hostage-taken-in-foiled-robbery-at-amsterdam-apple-store?utm_medium=rss	Foiled robbery hostage situation at Amsterdam Apple Store is overAn armed robbery of the Amsterdam Apple Store led to a man being held at gunpoint as a hostage At approximately p m CET p m eastern two men in balaclavas left the Apple Store in Leidseplein Amsterdam On attempting to leave the store the situation escalated after they spotted nearby police The two men then grabbed a bystander and took them hostage as they went back into the store reports Het Parool Footage published to social media show one of the men holding the hostage around the neck and waving around a handgun Read more	2022-02-22 22:46:00
海外TECH	Engadget	Amazon accused of interfering in Alabama union rerun election	https://www.engadget.com/rwdsu-files-complaint-against-amazon-rerun-election-221043262.html?src=rss	Amazon accused of interfering in Alabama union rerun electionThe union that wants to represent workers at Amazon s BHM facility in Bessemer Alabama is accusing the company of once again violating the National Labor Relations Act In an email the Retail Wholesale and Department Store Union RWDSU sent Tuesday it said it would file Unfair Labor Practice charges against the retailer Specifically the organization alleges Amazon broke the law by removing pro union posters put up by members of BAmazon and implementing a new rule that limits the amount of time workers can spend inside the facility to minutes before and after their shift Additionally the RWDSU alleges Amazon forced workers to attend anti union meetings If the NLRB finds Amazon s actions violated the law the union could then challenge the result of the ongoing second election at BHM That vote is currently scheduled to conclude on March th “While we haven t seen today s filing yet we re confident that our teams have fully complied with the law Our focus remains on working directly with our team to make Amazon a great place to work quot Amazon spokesperson Kelly Nantel told Engadget Last April BHM became the first large Amazon facility in the US to hold a union vote While workers there voted decisively against forming a union the RWDSU went on to successfully challenge the vote The NLRB ruled the company had illegally interfered with the vote and called for a rerun of the election to be held Whether Amazon wins or loses the second election at Bessemer it could be months before the NLRB makes a decision on the latest allegations from the RWDSU That could set the stage for a protracted labor battle at the facility nbsp	2022-02-22 22:10:43
海外TECH	CodeProject Latest Articles	DateOnly in .NET 6 and ASP.NET Core 6	https://www.codeproject.com/Articles/5325820/DateOnly-in-NET-6-and-ASP-NET-Core-6	dateonly	2022-02-22 22:01:00
海外科学	NYT > Science	The C.D.C. Isn’t Publishing Large Portions of the Covid Data It Collects	https://www.nytimes.com/2022/02/20/health/covid-cdc-data.html	analyses	2022-02-22 22:57:24
金融	金融総合：経済レポート一覧	ウクライナ地政学リスクヘッジで買われる金と売られる仮想通貨：木内登英のGlobal Economy ＆ Policy Insight	http://www3.keizaireport.com/report.php/RID/485485/?rss	lobaleconomypolicyinsight	2022-02-23 00:00:00
金融	金融総合：経済レポート一覧	米国SPACが迎えている転換点と日本への示唆	http://www3.keizaireport.com/report.php/RID/485486/?rss	大和総研	2022-02-23 00:00:00
金融	金融総合：経済レポート一覧	世界のインフレから隔離される日本 サービス業ＰＭＩ 販売価格はまさかの50 割れ：Market Flash	http://www3.keizaireport.com/report.php/RID/485487/?rss	marketflash	2022-02-23 00:00:00
金融	金融総合：経済レポート一覧	FSBレポ統計の日本分集計結果（2022年1月）	http://www3.keizaireport.com/report.php/RID/485490/?rss	日本銀行	2022-02-23 00:00:00
金融	金融総合：経済レポート一覧	FX Daily（2月21日）～ドル円、114円台後半で軟調な推移	http://www3.keizaireport.com/report.php/RID/485491/?rss	fxdaily	2022-02-23 00:00:00
金融	金融総合：経済レポート一覧	EIOPAが2022年の監督上のコンバージェンス計画を公表：保険・年金フォーカス	http://www3.keizaireport.com/report.php/RID/485494/?rss	eiopa	2022-02-23 00:00:00
金融	金融総合：経済レポート一覧	複数の国にまたがる年金基金の状況（欧州）～EIOPAの報告書（2021年12月）の紹介：保険・年金フォーカス	http://www3.keizaireport.com/report.php/RID/485501/?rss	eiopa	2022-02-23 00:00:00
金融	金融総合：経済レポート一覧	トランジション・ファイナンスに必要な高圧経済～トランジションは戦略的政府サポートも：高田レポート	http://www3.keizaireport.com/report.php/RID/485512/?rss	岡三証券	2022-02-23 00:00:00
金融	金融総合：経済レポート一覧	米国企業2021年10-12月期決算の動向～不確実性がある中でも増収増益基調を継続：マーケットレター	http://www3.keizaireport.com/report.php/RID/485531/?rss	不確実性	2022-02-23 00:00:00
金融	金融総合：経済レポート一覧	グローバルREITウィークリー 2022年2月第4週号～先週のグローバルREIT市場は、前週末比では▲0.4％	http://www3.keizaireport.com/report.php/RID/485532/?rss	日興アセットマネジメント	2022-02-23 00:00:00
金融	金融総合：経済レポート一覧	もはや退屈ではなくなった欧州社債市場：プロの視点	http://www3.keizaireport.com/report.php/RID/485535/?rss	退屈	2022-02-23 00:00:00
金融	金融総合：経済レポート一覧	FRBが救世主にはなれないウクライナ情勢による金融市場の混乱：中国の対応も市場の注目に：木内登英のGlobal Economy ＆ Policy Insight	http://www3.keizaireport.com/report.php/RID/485539/?rss	lobaleconomypolicyinsight	2022-02-23 00:00:00
金融	金融総合：経済レポート一覧	超緩和的だった金融政策からの転換	http://www3.keizaireport.com/report.php/RID/485556/?rss	大和総研	2022-02-23 00:00:00
金融	金融総合：経済レポート一覧	みずほ経済・金融マンスリー 2022年2月22日号～世界の感染動向：世界全体でみれば感染が収束傾向継続...	http://www3.keizaireport.com/report.php/RID/485562/?rss	Detail Nothing	2022-02-23 00:00:00
金融	金融総合：経済レポート一覧	移行金融推進に向けた課題～ロードマップ高度化と金融機関への後押しが急務	http://www3.keizaireport.com/report.php/RID/485586/?rss	日本総合研究所	2022-02-23 00:00:00
金融	金融総合：経済レポート一覧	欧州グリーンウォッシング回避の取り組みと本邦投信市場への影響についての考察	http://www3.keizaireport.com/report.php/RID/485587/?rss	三菱ufj信託銀行	2022-02-23 00:00:00
金融	金融総合：経済レポート一覧	住宅ローン利用者の実態調査結果（2021年10月調査）～利用した金利タイプでは、「変動型」と「全期間固定型」がわずかに減少し、「固定期間選択型」が増加	http://www3.keizaireport.com/report.php/RID/485595/?rss	住宅ローン	2022-02-23 00:00:00
金融	ニュース - 保険市場TIMES	損保ジャパンら、日清紡マイクロデバイスとの協業開始を発表	https://www.hokende.com/news/blog/entry/2022/02/23/080000		2022-02-23 08:00:00
海外ニュース	Japan Times latest articles	U.S. announces first tranche of Russia sanctions as Biden says Ukraine ‘invasion’ is ‘beginning’	https://www.japantimes.co.jp/news/2022/02/23/world/us-sanctions-russia-ukraine-invasion/	U S announces first tranche of Russia sanctions as Biden says Ukraine invasion is beginning The U S president said the measures would target financial institutions and Russian elites as Moscow began setting up a rationale to take more territory by	2022-02-23 07:06:20
ニュース	BBC News - Home	Screaming Trees frontman Mark Lanegan dies aged 57	https://www.bbc.co.uk/news/entertainment-arts-60487917?at_medium=RSS&at_campaign=KARANGA	american	2022-02-22 22:27:25
ニュース	BBC News - Home	Ros Atkins on... key moments in Russia's military build-up	https://www.bbc.co.uk/news/world-europe-60486318?at_medium=RSS&at_campaign=KARANGA	ukraine	2022-02-22 22:42:14
ニュース	BBC News - Home	River Severn Flooding: Homes and businesses evacuated	https://www.bbc.co.uk/news/uk-england-shropshire-60475077?at_medium=RSS&at_campaign=KARANGA	shropshire	2022-02-22 22:10:28
ニュース	BBC News - Home	Chelsea take command of Champions League tie against Lille	https://www.bbc.co.uk/sport/football/60465271?at_medium=RSS&at_campaign=KARANGA	Chelsea take command of Champions League tie against LilleTitle holders Chelsea take command of their Champions League last tie against Lille with a comfortable first leg victory at Stamford Bridge	2022-02-22 22:42:53
ニュース	BBC News - Home	Mickelson to take break from game after 'reckless' comments on Saudi Arabia	https://www.bbc.co.uk/sport/golf/60487858?at_medium=RSS&at_campaign=KARANGA	Mickelson to take break from game after x reckless x comments on Saudi ArabiaPhil Mickelson sincerely regrets his criticism of Saudi Arabia s regime and will take a break from the game to work on becoming the man I want to be	2022-02-22 22:19:27
ニュース	BBC News - Home	Tuilagi set for England start against Wales as Marchant left out of 25-man squad	https://www.bbc.co.uk/sport/rugby-union/60486587?at_medium=RSS&at_campaign=KARANGA	Tuilagi set for England start against Wales as Marchant left out of man squadCentre Joe Marchant has been left out of England s man squad to face Wales at Twickenham on Saturday with Manu Tuilagi set to start in the midfield	2022-02-22 22:24:16
ニュース	BBC News - Home	Vlahovic scores 32 seconds into Champions League debut but Juve held at Villarreal	https://www.bbc.co.uk/sport/football/60465278?at_medium=RSS&at_campaign=KARANGA	Vlahovic scores seconds into Champions League debut but Juve held at VillarrealDusan Vlahovic scores the quickest Champions League debut goal ever but Juventus are pegged back to draw at Villarreal	2022-02-22 22:50:17
北海道	北海道新聞	男女賃金格差訴訟で和解　米サッカー女子代表と連盟	https://www.hokkaido-np.co.jp/article/648943/	女子代表	2022-02-23 07:18:00
北海道	北海道新聞	オニールの「２１」が永久欠番に　ヤンキース、８月に記念式典	https://www.hokkaido-np.co.jp/article/648942/	大リーグ	2022-02-23 07:18:00
北海道	北海道新聞	軍事協力含む宣言署名　ロシア・アゼルバイジャン首脳	https://www.hokkaido-np.co.jp/article/648936/	軍事協力	2022-02-23 07:08:32
ビジネス	東洋経済オンライン	資生堂､化粧品｢安売り連発｣に透ける危うい戦略 最高級ブランドまで｢大盤振る舞い｣の実態 | 専門店･ブランド･消費財 | 東洋経済オンライン	https://toyokeizai.net/articles/-/514047?utm_source=rss&utm_medium=http&utm_campaign=link_back	冬の時代	2022-02-23 07:30:00