投稿時間:2022-02-16 13:31:26 RSSフィード2022-02-16 13:00 分まとめ(41件)

カテゴリー等	サイト名等	記事タイトル・トレンドワード等	リンクURL	頻出ワード・要約等/検索ボリューム	登録日
IT	気になる、記になる…	｢Anker 高耐久ナイロン ライトニングケーブル｣に新カラーのブルーホワイトが追加 − 10％オフセールも開催中	https://taisy0.com/2022/02/16/152142.html	anker	2022-02-16 03:12:45
IT	気になる、記になる…	3DSシリーズとWii Uの｢ニンテンドーeショップ｣がサービス終了へ	https://taisy0.com/2022/02/16/152139.html	追加	2022-02-16 03:00:34
IT	＠IT Security&Trustフォーラム 最新記事一覧	ベンダーの脆弱性修正、何日かかる？	https://atmarkit.itmedia.co.jp/ait/articles/2202/16/news094.html	google	2022-02-16 12:30:00
TECH	Engadget Japanese	EVスタートアップのFisker、3万ドル切りのEV「Pear」の予約受付を開始	https://japanese.engadget.com/fisker-starts-accepting-29900-ev-reservation-035025570.html	fisker	2022-02-16 03:50:25
TECH	Engadget Japanese	「M2」搭載MacBook Pro、前モデルとデザインは同じで3月発売のウワサ	https://japanese.engadget.com/m-2-macbookpro-unchanged-design-nextmonth-034045673.html	macbookpro	2022-02-16 03:40:45
TECH	Engadget Japanese	Twitter、ハラスメント対策のセーフティモードを英語圏の約半数のユーザーに拡大	https://japanese.engadget.com/twitter-safety-mode-expandsed-031042044.html	safetymode	2022-02-16 03:10:42
ROBOT	ロボスタ	シャープが首掛けタイプのAIネックスピーカー『AQUOS サウンドパートナー』一般発売へ　Alexa対応で生活防水、ハンズフリー通話	https://robotstart.info/2022/02/16/aquos-sp-neckspeaker.html	シャープが首掛けタイプのAIネックスピーカー『AQUOSサウンドパートナー』一般発売へAlexa対応で生活防水、ハンズフリー通話シェアツイートはてブシャープは、音声アシスタント機能を搭載したウェアラブルAIスピーカー『AQUOSサウンドパートナー』を年月日に発売する。	2022-02-16 03:27:53
ROBOT	ロボスタ	新東工業　6軸力覚センサと連動した高精度なティーチングを実現　オフラインティーチングソフト「ZYXerPath」発表	https://robotstart.info/2022/02/16/zyxer-path-teaching-soft.html		2022-02-16 03:13:59
IT	＠IT 全フォーラム 最新記事一覧	ベンダーの脆弱性修正、何日かかる？	https://atmarkit.itmedia.co.jp/ait/articles/2202/16/news094.html	google	2022-02-16 12:30:00
IT	ITmedia 総合記事一覧	[ITmedia News] ウクライナ国防省のWebサイトにDDoS攻撃　軍サイトや銀行も被害に　攻撃者は不明	https://www.itmedia.co.jp/news/articles/2202/16/news108.html	itmedia	2022-02-16 12:45:00
IT	ITmedia 総合記事一覧	[ITmedia News] 3DSとWii UのDLコンテンツ、23年3月に販売終了	https://www.itmedia.co.jp/news/articles/2202/16/news106.html	itmedianewsds	2022-02-16 12:43:00
IT	ITmedia 総合記事一覧	[ITmedia ビジネスオンライン] 大丸松坂屋、基本営業時間を短縮へ　収益性や従業員の働き方を「総合的に勘案」	https://www.itmedia.co.jp/business/articles/2202/16/news103.html	itmedia	2022-02-16 12:40:00
IT	ITmedia 総合記事一覧	[ITmedia ビジネスオンライン] 私大志願者数最終速報　1位は近大、躍進したのは？	https://www.itmedia.co.jp/business/articles/2202/16/news107.html	itmedia	2022-02-16 12:38:00
IT	ITmedia 総合記事一覧	[ITmedia News] マネージドNFSサーバのAmazon EFSが大幅性能向上　読み取りのレイテンシがミリ秒からマイクロ秒単位に	https://www.itmedia.co.jp/news/articles/2202/16/news105.html	amazonefs	2022-02-16 12:32:00
IT	ITmedia 総合記事一覧	[ITmedia News] 営業管理に最も使うツールは「Excel」　感じている課題の1位は？　法人向けソフト提供会社調査	https://www.itmedia.co.jp/news/articles/2202/16/news102.html	excel	2022-02-16 12:28:00
IT	ITmedia 総合記事一覧	[ITmedia PC USER] パナソニックWeb直販で「決算セール」を実施中　クーポン適用で最大1万8000円引きに	https://www.itmedia.co.jp/pcuser/articles/2202/16/news101.html	itmediapcuser	2022-02-16 12:20:00
IT	ITmedia 総合記事一覧	[ITmedia News] ソニー、穴が空いたイヤフォン「LinkBuds」を国内販売　2万3000円前後	https://www.itmedia.co.jp/news/articles/2202/16/news100.html	itmedia	2022-02-16 12:12:00
IT	ITmedia 総合記事一覧	[ITmedia ビジネスオンライン] 「テレワークはデメリットのほうが多い」52.1％、理由は？	https://www.itmedia.co.jp/business/articles/2202/16/news084.html	itmedia	2022-02-16 12:05:00
TECH	Techable（テッカブル）	5200万円で宇宙へ！ Virgin Galacticが一般向けチケットを米国2月16日発売	https://techable.jp/archives/173507	virgin	2022-02-16 03:00:26
AWS	AWS Japan Blog	新しい AWS コースで ML モデルを運用する方法を学ぶ	https://aws.amazon.com/jp/blogs/news/learn-how-to-operationalize-ml-models-with-new-aws-course/	VentureBeatのレポートでは、データサイエンスプロジェクトのが本番環境にはなっていないと指摘しています。	2022-02-16 03:07:13
Ruby	Rubyタグが付けられた新着投稿 - Qiita	Dockerのlocalhostが突然、接続されなくなる問題を解決しました。	https://qiita.com/keitaro-code/items/bf9c2f22f5134a0e4ffb	解決方法①ERRORinternalloadmetadatafordockeriolibraryubuntuまずは、こちらのエラーコードを検索するとどうやら、いつもと違うwifiを使用しているとのことでした。	2022-02-16 12:04:19
技術ブログ	Developers.IO	クラウド上から負荷テストを実行できるSaaS型のk6クラウドに入門	https://dev.classmethod.jp/articles/lets-try-k6-cloud/	負荷	2022-02-16 03:15:11
海外TECH	DEV Community	All React Hooks Explained	https://dev.to/siddharthroy/all-react-hooks-explained-42p3	All React Hooks ExplainedSince React the most common way to build a react component is using function because now we can have all the features of class components in functional components using hooks But why use a functional component instead of a class based component Using a functional component with hooks reduces the line of codes and makes our code look more clean and readable In this blog you are going to learn how to use the most used built in react hooks and how to make a custom hook from scratch useStateuseEffectuseContextuseReduceruseCallbackuseMemouseRef useState const state setState useState initialState If you are used to class based components you know that functional components don t state useState allows you to have state in functional components const value setValue useState initialValue const name setName useState Siddharth console log name gt SiddharthsetName React sets the name to React and re render the component Value of name after re renderconsole log name gt ReactThe useState hook is a function like every other hook It takes an initial value and returns an array containing the value and a function to change the value On first render the value is set to initialValue The setValue function is for updating the value It takes the new value as the first argument and triggers a re render on the component Here is an example to understand it better import useState from react function App console log Component render const number setNumber useState function updateNumber setNumber Math random return lt gt lt p gt number lt p gt lt br gt lt button onClick updateNumber gt Update number lt button gt lt gt export default App NOTE It s doesn t have to be named as value and setValue you can name it anything you want but value and setValue style is preferred among all developers If the new value is based on the previous value then you can do this const number setNumber useState function updateNumber Do this setNumber prevNumber gt prevNumber not this setNumber number If you are storing an object inside a state then always use the object spread syntax to make a copy otherwise the component won t re render const initialUserState name Siddharth Roy age const user setUser useState initialUserState Do thissetUser prevState gt let newState prevState newState age prevState age return prevState newState Make a new copy using spread syntax After re render user age is Not thissetUser prevState gt let newState prevState newState age prevState age return newState Component won t re renderThe reason behind this is React uses Object is for comparing new value to previous value and if they are the same It won t re render and Object is does not check what s inside the object let obj name s let obj name s Object is obj obj gt falseobj objObject is obj obj gt true Using spread operator to copy the objectobj obj Object is obj obj gt falseNOTE Spread operator won t copy nested objects you will have to copy them manually useEffect useEffect didUpdate The useEffect hook has many use cases it is a combination of componentDidMount  componentDidUpdate and componentWillUnmount from Class Components Here is a simple demo of useEffect hook import useState useEffect from react function App const number setNumber useState useEffect gt console log This runs This will run when it mounts and update return lt gt lt p gt number lt p gt lt br gt lt button onClick gt setNumber prevNum gt prevNum gt Increase Number lt button gt lt gt export default App The useEffect hook is a function that takes a function as its first argument and that function will run when the component mounts and updateAs you saw the function ran the first time when the component got mounted and whenever it updated This function in the first argument of useEffect hook will only run when the component gets mounted and updated It also takes an array as a second optional argument and it behaves differently based on the array Like for this example the function will run only run when the component mounts import useState useEffect from react function App const number setNumber useState useEffect gt console log Component Mounted Only runs when the component gets mounted lt Give an empty array in second argument return lt gt lt p gt number lt p gt lt br gt lt button onClick gt setNumber prevNum gt prevNum gt Increase Number lt button gt lt gt export default App The array we passed on in the second argument is called dependency list when we omit the list the function run when the component mounts and when the component update eg When a state change when we put an empty array in the second argument it only runs when the component gets mounted You can also put state inside the dependencies list and it will only run when the component gets mounted and when the state changes import useState useEffect from react function App const number setNumber useState const message setMessage useState Hi useEffect gt console log Component Mounted Only runs when the component gets mounted lt Give an empty array in second argument useEffect gt console log Component mounted or message changed message useEffect gt console log Component mounted or number changed number return lt gt lt p gt message lt p gt lt p gt number lt p gt lt br gt lt button onClick gt setMessage prevMsg gt prevMsg i gt Increase Hi lt button gt lt button onClick gt setNumber prevNum gt prevNum gt Increase Number lt button gt lt gt export default App You can put multiple states in the dependency list but do note that if you are accessing any state from inside the function in useEffect hook then you have to put that state in the dependencies list useEffect gt Do stuffs state state state Don t do thisuseEffect gt Doing something with state lt Not providing state in dependencies listNow the last thing left is the cleanup function this function is return by the function from the first argument and will run when the component gets unmounted useEffect gt Initiate a request to API and update a state API requestUserData return gt Cleanup function Cancel the request when the component gets unmounted API cancelUserDataRequest Sometimes when we run an async function when the comp gets mounted if the function tries to update a state after the comp gets unmounted it can cause memory leaks so it s better to stop that from happening using the cleanup function useContext const value useContext MyContext Normally if you want to share a state between components you would have to move the state to the uppermost component and then pass it down using props of every component This method might be ok for small scale project but for a big scale project this can be tedious so to help with that useContext allow you to have a global state accessible from any component without passing down the state There are two functions to note when using Context API Create a context with a default valueconst context createContext defaultValue defaultValue is optionalconst value useContext conext Get the value from contextHere is an example using Context APIIn App js import useState createContext from react import Component from Component import Component from Component import Adder from Adder const Context createContext function App const number setNumber useState return lt Context Provider value number setNumber gt lt p gt Number number lt p gt Any component inside this component can access the value of the context We can also provide the value of the context here lt Component gt Dummy component lt Component gt Dummy component lt Adder gt lt Component gt lt Component gt lt Context Provider gt export Context export default App In Adder js import useContext from react import Context from App export default function Adder const contextValue useContext Context return lt div style border px solid black gt lt p gt Inside Adder Component lt p gt lt p gt Number contextValue number lt p gt lt button onClick gt contextValue setNumber prevNum gt prevNum gt Add Number lt button gt lt div gt The result ExplanationIn App js we are creating a context and using the Provider Component inside the Context object returned by createContext as the uppermost component Any component inside Context Provider Component can access the value of the ContextWe are also passing the number and setNumber from App js as the value of the Context using the value prop of the Context Provider componentWe need to export this Context object to be used inside the other components when using useContextIn Adder js we are simply importing the Context object and using it with useContext hook to get the value of the contextThe object returned by useContext contains the value we provided in the value prop of the provider componentNote that whenever the value of context change the entire component tree gets re rendered and can affect performance If you don t want that behavior it s better to use external solutions for global state management like react redux that only re render the desired component You can also have multiple context and context providers if you want useReducer const state dispatch useReducer reducer initialArg init This is an alternative to useState it takes an additional function called reducer it s similar to how redux handles state useReducer is useful when you have a complex state like an object with multiple sub values Here is a simple counter example from React Docs using useReducer import useReducer from react const initialState count function reducer state action switch action type case increment return count state count case decrement return count state count default throw new Error function App const state dispatch useReducer reducer initialState return lt gt Count state count lt button onClick gt dispatch type decrement gt lt button gt lt button onClick gt dispatch type increment gt lt button gt lt gt export default AppHere is another example using complex state import useReducer from react const initialState username Siddharth Roy age function reducer state action switch action type case increment age return state age state age case decrement age return state age state age case change username return state username action payload default throw new Error function App const state dispatch useReducer reducer initialState return lt gt lt p gt Username state username lt p gt lt p gt Age state age lt p gt lt button onClick gt dispatch type decrement age gt lt button gt lt button onClick gt dispatch type increment age gt lt button gt lt input type text value state username onChange e gt dispatch type change username payload e target value gt lt gt export default App Lazy initializationYou can also create the initial state lazily To do this you can pass an init function as the third argument The initial state will be set to init initialArg It lets you extract the logic for calculating the initial state outside the reducer This is also handy for resetting the state later in response to an action import useReducer from react const initialCount function init initialCount return count initialCount function reducer state action switch action type case increment return count state count case decrement return count state count default throw new Error function App const state dispatch useReducer reducer initialCount init return lt gt Count state count lt button onClick gt dispatch type decrement gt lt button gt lt button onClick gt dispatch type increment gt lt button gt lt gt export default App useCallback const memoizedCallback useCallback gt doSomething a b a b Usually if you have an inline function in a react component whenever that component re render that function will also get re createdThe useCallback hook takes an inline function and a dependencies list and returns a memoized version of that function That function will only recreate when its dependencies change You can visualize the function re creation using a SetNOTE Set can only have unique elements Object is is used to check and remove duplicate elements Without useCallback import useState from react const functionsCounter new Set function App const count setCount useState const otherCounter setOtherCounter useState const increment gt setCount count const decrement gt setCount count const incrementOtherCounter gt setOtherCounter otherCounter functionsCounter add increment functionsCounter add decrement functionsCounter add incrementOtherCounter console log functionsCounter size return lt gt Count count lt button onClick increment gt lt button gt lt button onClick decrement gt lt button gt lt button onClick incrementOtherCounter gt incrementOtherCounter lt button gt lt gt export default App With useCallback import useState useCallback from react const functionsCounter new Set function App const count setCount useState const otherCounter setOtherCounter useState const increment useCallback gt setCount count count const decrement useCallback gt setCount count count const incrementOtherCounter useCallback gt setOtherCounter otherCounter otherCounter functionsCounter add increment functionsCounter add decrement functionsCounter add incrementOtherCounter console log functionsCounter size return lt gt Count count lt button onClick increment gt lt button gt lt button onClick decrement gt lt button gt lt button onClick incrementOtherCounter gt incrementOtherCounter lt button gt lt gt export default App The use cases of the hook are very small you will most likely never have to use this hook useMemo const memoizedValue useMemo gt computeExpensiveValue a b a b The useMemo hooks take a function to compute a value and a dependency array and return a memoized value This will only re compute the value when its dependencies have changed This hook is useful when you are doing expensive calculations inside a component every time it renders An example without useMemo function DemoComponent const state setState useState const state setState useState Math PI const someValue computeExpensiveValue state state Takes ms on every render return lt gt someValue lt gt With useMemo function DemoComponent const state setState useState const state setState useState Math PI const someValue useMemo gt return computeExpensiveValue state state This only runs when the state or state changes state state return lt gt someValue lt gt useRef const refContainer useRef initialValue useRef returns a mutable ref object whose current property is initialized to the passed argument initialValue The returned object will persist for the full lifetime of the component The most common use case of this hook is to store a reference to a DOM Element function TextInputWithFocusButton const inputEl useRef null const onButtonClick gt current points to the mounted text input element inputEl current focus return lt gt lt input ref inputEl type text gt lt button onClick onButtonClick gt Focus the input lt button gt lt gt Another use case is to store a mutable value and it will persist during the entire life cycle of the component but do note that whenever you change the current property the component won t re render Custom hook from scratchNow that you have learned how to use all react hooks It s time to build your own hook from scratch A custom hook is just a regular javascript function that uses the other hooks provided by React to extract component logic into a reusable function For example look at this componentfunction App const mounted useRef false useEffect gt To check if component is mounted or not mounted current true return gt mounted current false To check if the component is mounted or not check mounted current if mounted current This component uses two hooks to check if the component is mounted or not This is useful when you are running a long async function and the component can dismount at any time We can extract this logic into a reusable function function useIsMounted React hook name must start from use const mounted useRef false useEffect gt mounted current true return gt mounted current false return gt mounted current Then use it like thisfunction App const isMounted useIsMounted To check if is mounted if isMounted Now our code looks more cleaner and we can use the same logic in many components	2022-02-16 03:05:35
医療系	医療介護 CBnews	コロナ感染妊産婦受け入れ、一部地域で対応困難に-厚労省が事務連絡、産科的対応は自施設で	https://www.cbnews.jp/news/entry/20220215161950	一部地域	2022-02-16 12:50:00
金融	JPX マーケットニュース	[JPX,東証]第5回「ＳＰＡＣ制度の在り方等に関する研究会」の開催について	https://www.jpx.co.jp/news/1020/20220216-01.html	研究会	2022-02-16 13:00:00
金融	JPX マーケットニュース	[東証]新規上場日の初値決定前の気配運用について：ウェルビングループ（株）	https://www.jpx.co.jp/news/1031/20220216-03.html	新規上場	2022-02-16 13:00:00
金融	JPX マーケットニュース	[東証]新規上場日の初値決定前の気配運用について：（株）ハンズ	https://www.jpx.co.jp/news/1031/20220216-02.html	新規上場	2022-02-16 13:00:00
金融	JPX マーケットニュース	[東証]新規上場日の初値決定前の気配運用について：エッジテクノロジー（株）	https://www.jpx.co.jp/news/1031/20220216-01.html	新規上場	2022-02-16 13:00:00
海外ニュース	Japan Times latest articles	Some Canadian truckers dig in, while others disperse amid new police powers	https://www.japantimes.co.jp/news/2022/02/16/world/canada-truckers-emergency-powers/	Some Canadian truckers dig in while others disperse amid new police powersTrudeau s use of the Emergency Act marks only the second time in Canadian history that such powers have been invoked in peacetime	2022-02-16 12:25:26
海外ニュース	Japan Times latest articles	Mizuho and Mitsubishi UFJ among banks that gave coal sector over $1.5 trillion in three years	https://www.japantimes.co.jp/news/2022/02/16/business/mizuho-mitsubishi-ufj-among-banks-gave-coal-sector-1-5-trillion-three-years/	Mizuho and Mitsubishi UFJ among banks that gave coal sector over trillion in three yearsThe Japanese firms both members of the Net Zero Banking Alliance were identified as the two biggest lenders in a report by a group of	2022-02-16 12:07:46
ニュース	BBC News - Home	Ottawa police chief resigns amid anti-mandate protests	https://www.bbc.co.uk/news/world-us-canada-60395241?at_medium=RSS&at_campaign=KARANGA	protests	2022-02-16 03:31:05
ニュース	BBC News - Home	Ukrainians wary of Russian claims of withdrawal	https://www.bbc.co.uk/news/world-europe-60398296?at_medium=RSS&at_campaign=KARANGA	russia	2022-02-16 03:11:50
ビジネス	ダイヤモンド・オンライン - 新着記事	供給網の混乱、ITで解決目指す新興企業 - WSJ発	https://diamond.jp/articles/-/296574	新興企業	2022-02-16 12:08:00
北海道	北海道新聞	キリン、中国の清涼飲料事業撤退　海外戦略見直し	https://www.hokkaido-np.co.jp/article/646277/	事業撤退	2022-02-16 12:03:49
北海道	北海道新聞	無許可で貨物事業営む　自動車販売会社の男を逮捕　江別	https://www.hokkaido-np.co.jp/article/646317/	自動車販売	2022-02-16 12:02:00
マーケティング	MarkeZine	【耳から学ぶ】メタバース×マーケティングの可能性は？／編集部対談スタイル、初収録！	http://markezine.jp/article/detail/38373	編集部	2022-02-16 12:05:00
IT	週刊アスキー	無印良品、「MUJI passport」に新たな決済手段「COIN+」を導入	https://weekly.ascii.jp/elem/000/004/083/4083646/	passport	2022-02-16 12:30:00
IT	週刊アスキー	かつやお得な6日間「ロースカツ」「ヒレカツ」4品が150円引きに	https://weekly.ascii.jp/elem/000/004/083/4083657/	飲食	2022-02-16 12:20:00
海外TECH	reddit	[POSTGAME THREAD] THE GRIZZLIES (41-18, .695 nice) FINALLY BEAT THE FUCKING PELICANS (23-35) 121-109 BEHIND A HUGE GAME FROM TYUS STONES	https://www.reddit.com/r/memphisgrizzlies/comments/stln7r/postgame_thread_the_grizzlies_4118_695_nice/	POSTGAME THREAD THE GRIZZLIES nice FINALLY BEAT THE FUCKING PELICANS BEHIND A HUGE GAME FROM TYUS STONESGRIZZLIES ARE WITH ZIAIRE S AFRO PGT GENERATOR AINT WORKIN SO DEAL WITH THE LINK SEE YALL TOMORROW VS PORTLAND CJ CANT HURT US THERE ANYMORE submitted by u nam to r memphisgrizzlies link comments	2022-02-16 03:23:57
海外TECH	reddit	Karma for karma | Upvote this then comment below 👇 Upvote each other’s comments too (sorry if i missed you earlier)❤️	https://www.reddit.com/r/FreeKarma4You/comments/stl9wz/karma_for_karma_upvote_this_then_comment_below/	Karma for karma Upvote this then comment below Upvote each other s comments too sorry if i missed you earlier ️ submitted by u Ijustneedweednmoney to r FreeKarmaYou link comments	2022-02-16 03:05:14
ニュース	THE BRIDGE	TechCrunch Japanが終わっちゃうみたい	https://thebridge.jp/2022/02/i-miss-techcrunch-japan	TechCrunchJapanが終わっちゃうみたいニュースサマリメディア運営を手掛けるBoundlessは月日、国内で運営を続けていたテック系ニュースサイト「TechCrunchJapan」および「エンガジェット日本版」の運営を終了すると発表した。	2022-02-16 03:22:37