投稿時間:2023-09-01 01:30:52 RSSフィード2023-09-01 01:00 分まとめ(35件)

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IT	気になる、記になる…	Nothing、｢Nothing Phone (2)｣の全額返金キャンペーンを開始 ｰ 購入後に満足しなかった場合は全額返金	https://taisy0.com/2023/09/01/176117.html	nothing	2023-08-31 15:19:23
IT	気になる、記になる…	｢Nintendo Switch (有機ELモデル)｣に新色｢マリオレッド｣が登場 ｰ 10月6日に発売へ	https://taisy0.com/2023/09/01/176112.html	nintendoswitc	2023-08-31 15:09:54
AWS	AWS Media Blog	Remote sports commentary made easy with Spalk and AWS	https://aws.amazon.com/blogs/media/remote-sports-commentary-made-easy-with-spalk-and-aws/	Remote sports commentary made easy with Spalk and AWSThis blog was coauthored by Michael Prendergast CTO and Co Founder Spalk Introduction A compelling sports broadcast is built on storytelling and commentators are the guides to these stories helping viewers experience the narratives playing out on screen Only recently have commentators enjoyed the flexibility of working remotely allowing them to broadcast for leagues around the world …	2023-08-31 15:52:41
python	Pythonタグが付けられた新着投稿 - Qiita	ジョジョの奇妙なLLMファインチューニング - おれはデータセットを改変するッ！ -	https://qiita.com/maskot1977/items/0b485b150dadc76cfd6b	登場	2023-09-01 00:02:05
Docker	dockerタグが付けられた新着投稿 - Qiita	Docker Dockerfileはbuild時のみ実行される	https://qiita.com/miriwo/items/8cfdd5566810e291edd9	build	2023-09-01 00:05:06
Ruby	Railsタグが付けられた新着投稿 - Qiita	クエリメソッド、遅延ロードについて	https://qiita.com/yusuke2310/items/53a5b787e0c0ce9b5fe2	問い合わせ	2023-09-01 00:36:55
技術ブログ	Developers.IO	I tried the different ways to check credit status inside Sumo Logic Account	https://dev.classmethod.jp/articles/i-tried-the-different-ways-to-check-credit-status-inside-sumo-logic-account/	I tried the different ways to check credit status inside Sumo Logic AccountIntroduction Hemanth from the Department of Alliance I ll demonstrate how to check credit status inside sumo	2023-08-31 15:40:27
海外TECH	Ars Technica	Exclusive: X violated its own policy by blocking First Amendment group’s ads	https://arstechnica.com/?p=1964669	adsthe	2023-08-31 15:22:33
海外TECH	MakeUseOf	The 9 Best Arduino LEGO Projects	https://www.makeuseof.com/best-arduino-lego-projects/	awesome	2023-08-31 15:31:23
海外TECH	MakeUseOf	Why Philips Hue Is Set to Shake Up the Smart Home Security Market	https://www.makeuseof.com/philips-hue-new-home-security-products/	marketthe	2023-08-31 15:15:24
海外TECH	MakeUseOf	Can't Delete a OneDrive File or Folder? Here's What to Do	https://www.makeuseof.com/how-to-fix-cant-delete-file-in-onedrive/	certain	2023-08-31 15:15:24
海外TECH	MakeUseOf	The Online Resources and Apps Providing Support for Managing Eating Disorders	https://www.makeuseof.com/online-resources-apps-support-eating-disorders/	The Online Resources and Apps Providing Support for Managing Eating DisordersThese online resources and mobile apps are designed to provide information support and tools for people managing eating disorders	2023-08-31 15:00:25
海外TECH	DEV Community	The useEffect Conversations we Shouldn't be Having Anymore	https://dev.to/ghamadi/the-useeffect-conversations-we-shouldnt-be-having-anymore-15b8	The useEffect Conversations we Shouldn x t be Having AnymoreYou would think that there has been enough talk about the useEffect hook but then you find something like this For this article I am only concerned with the first point state is immutable in react meaning you ll have to juggle your way around useeffectThe way useEffect is brought into this statement tells me that the person s pain with React is largely self inflicted Therefore at the risk of being redundant this post aims to be a comprehensive guide discussing the useEffect hook in detail From examining the hook s fundamental purpose to when and why and effect runs to examples of how to and not to use it I will point out that the React docs already talk extensively about this I try to use my own set of examples here and include cases which others may deem trivial but if you ve read the docs about useEffect feel free to jump to the TL DR section The purpose of useEffectIn React useEffect is a double edged sword It is a powerful tool in the world of functional components but it will also nick the wielder who does not understand how functional components work and when an effect is actually neededーwhich is rarely Let s start with this useEffect is not React s answer to reactivity In other words its purpose is not to monitor some state elements through the dependency array in order to alter other state elements An effect is typically something you want to do after rendering takes place and often involves interaction with the outside world Like an event handler it operates outside the main render flow However unlike an event handler it isn t explicitly triggered it simply runs after a component renders more on this later Effects can include a variety of tasks such as fetching data subscribing to some event notice subscribing not handling manipulating the DOM directly setting up timers or cleaning up after certain actions You can t do any of these things in the rendering code directly for two main reasons The rendering code is responsible only for computing the values required to render You cannot guarantee how many times a component re renders Imagine adding an event listener or making an API call every time a component re renders So what is the primary purpose of useEffect It is the escape hatch we need to perform a side effect that should not be part of the rendering logic and is not related to an event That s all it is and that s all it should be used for Excluding some exceptional edge cases any other form of reliance on useEffect signals bad design How useEffect worksNow that we ve established what useEffect is meant for let s delve into the specifics of how it works When does an effect run First let s take a quick look at the various phases a component goes through before being displayed A render is triggeredThe component is rendered and diffed with the DOMThe changes are committed to the DOMThese phases are always the same and in that order regardless whether the component just mounted or was updated So where do effects come in Effects run at the end of a commit after the screen updates This ensures that the effect always has access to the most up to date state and props It also makes sense because effects shouldn t typically be involved in the rendering logic function EmptyComponent useEffect gt console log This line is logged second console log This line is logged first return null With that in mind let s update the component s phases A render is triggeredThe component is rendered and diffed with the DOMThe changes are committed to the DOMEffects run The Dependency ArrayIf you only pass the callback argument to useEffect then that effect will run after every component render However you can and in most cases you should control when an effect runs by passing a second argument to the hook known as the dependency array With this array the effect will run when the component first mounts and on any subsequent re render where the elements in the array change useEffect gt console log Runs after every render useEffect gt console log Runs once after the initial render useEffect gt console log Runs after every render provided that count changes count Be careful here though It is easy to fall into the trap of assuming the effect runs because the dependency array changed which is false Without triggering a render the effect doesn t magically run function Component const counterRef useRef This effect will only run once no matter how many times counterRef current is incremented because updating a ref value does not trigger a render useEffect gt console log counter counterRef current counterRef current return lt div gt lt button onClick gt counterRef current gt Increment Counter lt button gt lt div gt With that let s update the component s phases again A render is triggeredThe component is rendered and diffed with the DOMThe changes are committed to the DOMEffects run subject to dependency array change The Cleanup CallbackBecause useEffect can run many times we need a mechanism to clean up some code that is outside the component s control Consider this example function useTimeLogger pageName const timeRef useRef useEffect gt setInterval gt console log Elapsed seconds on pageName timeRef current pageName Let s assume we have this custom hook being called in various pages in our multi route app You load the app in Page A and the logger begins working as expected What happens when you go from Page A to Page B If you guessed that you ll start getting mixed logs for both pages even though you left Page A you would be correct Even though the component of Page A unmounted we never canceled its interval To cancel an effect we use the cleanup callbackfunction useTimeLogger pageName const timeRef useRef useEffect gt const interval setInterval gt console log Elapsed seconds on pageName timeRef current return gt clearInterval interval timeRef current pageName React will call your cleanup function after committing the rendered changes and before the effect runs next time So now the component s phases become A render is triggeredThe component is rendered and diffed with the DOMThe changes are committed to the DOMPreviously registered cleanup callbacks run subject to dependency array change Effects run subject to dependency array change Cleanup callbacks are registeredNote that the cleanup function is also subject to the dependency array Not all the registered cleanup functions run after a render only those of which the dependency array changed Also just like all effects run when the component first mounts all cleanup functions run when the component unmounts To see this in action consider this example function Component const count setCount useState useEffect gt console log effect count return gt console log cleanup count count console log render count return lt button onClick gt setCount count gt count lt button gt When the component first mounts the logs would show render effect When the counter button is clicked render cleanup effect If the component is unmounted at that point we get cleanup Every effect should return its own cleanupIn some rare cases you might be tempted to have a useEffect that only returns a cleanup function Be careful if you do that because one of two things are very likely to have occurred You don t have an effectYou are cleaning up an effect that lives in another useEffectIn the first case you likely don t need useEffect and you should reconsider what that cleanup callback is doing The second case is generally a bad idea which in edge cases can lead to unexpected behavior especially if the dependency arrays are different Remember about the cleanup function is that it will only run before the next effect If your cleanup has different dependencies than your effect you may get into problems In both cases this is a signal of bad design I can t picture a scenario in one might be tempted to do this except when transforming class components to functional components When working on a project that included such tasks I saw code with useEffect that had a an empty dependency array and only a cleanup function in order to mimic the class component s componentWillUnmount lifecycle hook This ended up being a bad call in every single instance which brings us to our next point What useEffect is NOT meant for It is NOT lifecycle hookFunctional components are fundamentally different from class components A functional component is designed to fully run on every render unlike class components where the instance persists until the component unmounts Accordingly mapping class components to functional components should be done on a fundamental level as well We should not be looking at the class s lifecycle methods and thinking about which version of useEffect fits to translate this method or that Instead the whole purpose of the component should be considered and that purpose should be implemented from the ground up in a functional paradigm It is NOT part of the render logicIf you have read React code before or went through some tutorials you have probably seen something like this before function LoginForm const email setEmail useState const password setPassword useState const isFormValid setIsFormValid useState false useEffect gt const isEmailValid email includes const isPassValid password length gt setIsFormValid isEmailValid amp amp isPassValid email password assume we have some login function const submitForm gt login email password return lt form gt lt input type email value email onChange e gt setEmail e target value gt lt input type password value password onChange e gt setPassword e target value gt lt button disabled isFormValid onClick submitForm gt Login lt button gt lt form gt This works but it s bad practice for two main reasons Readability wise this doesn t scaleWe are detaching the event triggered effect from the event handler We have no way to go directly from the event handler to the effect dependent on values changed in the event handler As such the complexity of tracking why a visual effect took place increases with the size and complexity of the component Performance wise this is badRecall that an effect runs after the render is committed Let s walk this through Our event handlers trigger a component re render every time we type The effect runs and it updates the stateThe updated state triggers another re renderSo this code commits to the DOM twice after a single trigger You can imagine how twice per trigger could start being an issue if say you had a huge table with editable fields We are managing more state than necessaryAs a general rule the more state the component manages the more complex it is And accepting this pattern above leads to the bad habit of adding unnecessary state This case does not need useEffect because it is not running an effect in the first place Once we keep this principle in mind we start thinking in a different pattern and we end up with code that is more predictable and more performant function LoginForm const email setEmail useState const password setPassword useState isFormValid becomes a derived value not a state const isEmailValid email includes const isPassValid password length gt const isFormValid isEmailValid amp amp isPassValid assume we have some login function const submitForm gt login email password return lt form gt lt input type email value email onChange e gt setEmail e target value gt lt input type password value password onChange e gt setPassword e target value gt lt button disabled isFormValid onClick submitForm gt Login lt button gt lt form gt Now if the computation of a derived value is expensive the solution wouldn t be the dependency array of usEffect the solution is useMemo That s what it was made for const isFormValid useMemo gt return someComplexValidator email password email password someComplexValidator It is NOT an event listenerAssume the code above wasn t checking if the form is valid but was instead saving the form data to localStorage ️WARNING This example is only to illustrate a misuse of useEffect Please don t store passwords in localStorage You might argue that this is an effect because it is not part of the rendering logic and decide to use useEffect for it useEffect gt localStorage setItem email email localStorage setItem password password email password The logic above is indeed a side effect However this effect is actually triggered by the onChange events of the email and password input fields While relying on useEffect here does not entail adding state or rendering twice it does detach the event triggered effect from the event handler Despite resulting in a few more lines of code it is far cleaner to keep all event handling logic in the event handler TLDRThe useEffect hook is a powerful tool in a React developer s toolkit but it is not a Swiss army knife designed for a multitude of tasks Nor is it a tool to group event triggered effects of multiple elements in one place You will end up with much more predictable and maintainable code if you understand its core purpose and stick to it As a rule of thumb only use useEffect for cases where The logic is a genuine side effect The logic is not triggered by an eventDo not treat useEffect as a lifecycle hook Do not rely on useEffect for reactivity It s not an event listener and will only react to changes when a render happens Just because it uses a dependency array doesn t mean it s listening for changes If you are updating some state inside an effect based on another state you likely need a computed value If the computation is expensive use useMemo	2023-08-31 15:19:45
Apple	AppleInsider - Frontpage News	Daily deals Aug. 31: iPad $279, 15" MacBook Air $1,099, Anova Sous Vide Cooker $149, more	https://appleinsider.com/articles/23/08/31/daily-deals-aug-31-ipad-279-15-macbook-air-1099-anova-sous-vide-cooker-149-more?utm_medium=rss	Daily deals Aug iPad quot MacBook Air Anova Sous Vide Cooker moreToday s top deals include MacBooks from off an Anova Smart precision cooker off a Pelican Marine floating waterproof phone case off a wireless Bluetooth karaoke machine and more Get off a inch MacBook AirThe AppleInsider crew searches the web for top notch deals at online retailers to create a list of stellar bargains on popular tech gadgets including deals on Apple gear TVs accessories and other products We share our top finds every day to help you put more money back in your wallet Read more	2023-08-31 15:05:00
海外TECH	Engadget	Lavoie buys VanMoof, giving the e-bike maker a bankruptcy liferaft	https://www.engadget.com/lavoie-buys-vanmoof-giving-the-e-bike-maker-a-bankruptcy-liferaft-151547609.html?src=rss	Lavoie buys VanMoof giving the e bike maker a bankruptcy liferaftJust over a month after it declared bankruptcy e bike maker VanMoof has found a new home Lavoie the electric scooter division of McLaren Applied has agreed to buy VanMoof and make investments in it to grow the business According to a press release Lavoie and its parent plan to inject stability into the VanMoof operations before bringing together their capabilities to create a next generation e mobility business and establish a world leading premium e mobility offering Terms of the acquisition haven t been disclosed but Lavoie and McLaren Applied appear to have a reasonable understanding of the challenge that lies ahead to get VanMoof back on track McLaren Applied Chairman Nick Fry told Reuters nbsp that VanMoof is a company with a brilliant product that offers his team an opportunity in a new market but this is not going to be a walk in the park This also is a company that got itself into a difficult financial situation Fry noted that McLaren Applied would need to invest tens of millions of pounds in the short term to stabilize VanMoof Lavoie CEO Eliott Wertheimer pointed out that VanMoof has more than e bike customers some of whom have been struggling to obtain parts for repairs after production was suspended Lavoie s goal is to continue to keep those riders on the road whilst we stabilize and efficiently grow the VanMoof business and continue to develop its world class products However there will be layoffs as part of the acquisition VanMoof will also shift away from an in house retail store model to instead sell and service bikes via third party partners Peloton has made a similar shift in its business model over the last year or so This article originally appeared on Engadget at	2023-08-31 15:15:47
Cisco	Cisco Blog	Cisco Partners and Sustainability: we can help you do your part	https://feedpress.me/link/23532/16327149/cisco-partners-and-sustainability-we-can-help-you-do-your-part	Cisco Partners and Sustainability we can help you do your partWe ve expanded our sustainability efforts to our valued Partners by offering an Environmental Sustainability Specialization ESS Program which rewards partners for supporting Cisco s product return pledge and participating in Cisco s global initiative to responsibly repurpose or recycle end of use products	2023-08-31 15:00:43
金融	金融庁ホームページ	金融機関における貸付条件の変更等の状況について更新しました。（銀行分）	https://www.fsa.go.jp/ordinary/coronavirus202001/kashitsuke/20200430.html	金融機関	2023-08-31 17:00:00
金融	金融庁ホームページ	経済価値ベースの評価・監督手法に関するフィールドテスト（2023年）の仕様書及びテンプレートを公表しました。	https://www.fsa.go.jp/policy/economic_value-based_solvency/index.html	評価	2023-08-31 17:00:00
金融	金融庁ホームページ	規制の政策評価（ＲＩＡ）について公表しました。（規制の事前評価)	https://www.fsa.go.jp/seisaku/r5ria.html	政策評価	2023-08-31 17:00:00
金融	金融庁ホームページ	「デジタル社会の形成を図るための規制改革を推進するためのデジタル社会形成基本法等の一部を改正する法律」の施行に伴う金融庁関係政令の整備等に関する政令案について公表しました。	https://www.fsa.go.jp/news/r5/sonota/20230831/20230831.html	規制改革	2023-08-31 17:00:00
金融	金融庁ホームページ	「連結財務諸表の用語、様式及び作成方法に関する規則に規定する金融庁長官が定める企業会計の基準を指定する件」の一部改正（案）に対するパブリックコメントの結果等について公表しました。	https://www.fsa.go.jp/news/r5/sonota/20230831_kaikei.html	企業会計	2023-08-31 17:00:00
金融	金融庁ホームページ	「内部統制報告制度に関するＱ＆Ａ」等の改訂について公表しました。	https://www.fsa.go.jp/news/r5/sonota/20230831-2/20230831-2.html	内部統制	2023-08-31 17:00:00
金融	金融庁ホームページ	「金融サービス利用者相談室」における相談等の受付状況等（期間：令和５年４月１日～同年６月30日）を公表しました。	https://www.fsa.go.jp/soudan/2023soudan04-06/2023_04-06.html	金融サービス	2023-08-31 17:00:00
金融	金融庁ホームページ	金融庁の令和６年度税制改正要望について公表しました。	https://www.fsa.go.jp/news/r5/sonota/20230831.html	税制改正	2023-08-31 16:00:00
金融	金融庁ホームページ	令和６年度予算、機構・定員要求について公表しました。	https://www.fsa.go.jp/common/budget/yosan/6youkyuu.html	要求	2023-08-31 16:00:00
金融	金融庁ホームページ	令和６年度歳出概算要求書について公表しました。	https://www.fsa.go.jp/common/budget/yosan/6youkyuu-2.html	要求	2023-08-31 16:00:00
ニュース	BBC News - Home	Trump pleads not guilty in Georgia election fraud case	https://www.bbc.co.uk/news/world-us-canada-66676097?at_medium=RSS&at_campaign=KARANGA	election	2023-08-31 15:48:46
ニュース	BBC News - Home	Junior doctors and consultants to strike together	https://www.bbc.co.uk/news/health-66674058?at_medium=RSS&at_campaign=KARANGA	england	2023-08-31 15:47:39
ニュース	BBC News - Home	Brain fog after Covid linked to blood clots - study	https://www.bbc.co.uk/news/health-66658257?at_medium=RSS&at_campaign=KARANGA	memory	2023-08-31 15:19:21
ニュース	BBC News - Home	Wilko: First job losses confirmed as deal to buy whole firm fails	https://www.bbc.co.uk/news/business-66668569?at_medium=RSS&at_campaign=KARANGA	failshundreds	2023-08-31 15:33:07
ニュース	BBC News - Home	Police officer death: Wife pays tribute to officer killed on railway	https://www.bbc.co.uk/news/uk-england-nottinghamshire-66672411?at_medium=RSS&at_campaign=KARANGA	sacrifice	2023-08-31 15:43:23
ニュース	BBC News - Home	Body found in search for missing poet Gboyega Odubanjo	https://www.bbc.co.uk/news/uk-england-northamptonshire-66668998?at_medium=RSS&at_campaign=KARANGA	shambala	2023-08-31 15:31:40
ニュース	BBC News - Home	England squad to face Ukraine and Scotland includes Jordan Henderson and Harry Maguire	https://www.bbc.co.uk/sport/football/66668089?at_medium=RSS&at_campaign=KARANGA	England squad to face Ukraine and Scotland includes Jordan Henderson and Harry MaguireEngland boss Gareth Southgate includes Jordan Henderson and Harry Maguire in his squad for away games against Ukraine and Scotland in September	2023-08-31 15:52:27
ニュース	BBC News - Home	Saudis 'not a threat' and 'similar to China' - Uefa boss	https://www.bbc.co.uk/sport/football/66674368?at_medium=RSS&at_campaign=KARANGA	Saudis x not a threat x and x similar to China x Uefa bossThe Saudi Pro League is dismissed as a competitive threat by Aleksander Ceferin president of European football s governing body Uefa	2023-08-31 15:11:03
Azure	Azure の更新情報	Azure Firewall: Auto-Learn SNAT routes feature is now in public preview	https://azure.microsoft.com/ja-jp/updates/azure-firewall-autolearn-snat-routes-feature-is-now-in-public-preview/	Azure Firewall Auto Learn SNAT routes feature is now in public previewAzure Firewall can now learn address ranges and automatically configure them to be excluded from SNAT to reduce time and complexity spent manually defining SNAT private ranges	2023-08-31 16:00:02