投稿時間:2022-01-16 01:18:29 RSSフィード2022-01-16 01:00 分まとめ(20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
python	Pythonタグが付けられた新着投稿 - Qiita	プログラミング言語別のswitch文	https://qiita.com/ryoEast/items/5140f5e46f81ca5e9c49	リリースが年月の様です今まで長文まとめるの時間かかるな、そんないい記事書けないなとアウトプットはすぐ投稿できるTwitterに逃げていましたがswitch文でQiitaデビューしようと思いました、暖かい目でご覧ください書くことmatch関数とif関数の違いpythonプログラミング言語でのswitch文の違いC言語・Ruby・VBA書かないこと言語ごとの深掘り数値の場合どうなるか等コード内容色で英語の文字列を日本語で出力変数名colorcolorがredの場合、出力は赤colorがwhiteかblackの場合、出力はパンダの色複数条件コードGitHub動作環境macOSMontereyプログラミング言語のバージョンはそれぞれに記載caseとifの違いpythonpythonではmatchとなり、変数colorの中身によって処理を切り替える。	2022-01-16 00:38:50
python	Pythonタグが付けられた新着投稿 - Qiita	FireStoreにデータを保存と応用	https://qiita.com/babmuclr/items/9c3ea648192747dacdf4	Firebaseの公式ドキュメントFirestoreの公式ドキュメント実行する内容とはしては、下記の内容を、Firebaseに保存します。	2022-01-16 00:02:40
js	JavaScriptタグが付けられた新着投稿 - Qiita	【JavaScript】ES5とES6において、親クラス継承の違い	https://qiita.com/houka/items/db87452e0637a088d34f	【JavaScript】ESとESにおいて、親クラス継承の違いESにおいての継承ltscriptgt親functionPhonebrandpricethisbrandbrandthispricepricePhoneprototypecallfunctionconsoleloggiveXXXacall子functionsmartPhonebrandpricecolorsizePhonecallthisbrandpricethiscolorcolorthissizesizesmartPhoneprototypenewPhone親を呼び出すsmartPhoneprototypeconstructorsmartPhone子メソッドの追加smartPhoneprototypephotofunctionconsolelogtakephotosmartPhoneprototypemailfunctionconsolelogreceiveemailletiphonenewsmartPhoneiphonewhiteinchconsolelogiphonesmartPhonebrandiphonepricecolorblacksizeinchltscriptgtESでの継承ltscriptgt親classPhoneconstructorbrandpricethisbrandbrandthispricepricecallconsoleloggiveXXXacall子extendsを使えば継承できるclasssmartPhoneextendsPhoneconstructorbrandpricecolorsizesuprebrandpriceイコールPhonecallthisbrandpricethiscolorcolorthissizesizephotoconsolelogtakephotomailconsolelogreceiveemailletiphonenewsmartPhoneiphonepinkinchconsolelogiphonesmartPhonebrandiphonepricecolorpinksizeinchiphonecallgiveXXXacalliphonephototakephotoiphonemailreceiveemailltscriptgt違いESとESと比べて、親クラスを継承するときのコードが明らかに簡潔ですね。	2022-01-16 00:15:03
Ruby	Rubyタグが付けられた新着投稿 - Qiita	プログラミング言語別のswitch文	https://qiita.com/ryoEast/items/5140f5e46f81ca5e9c49	リリースが年月の様です今まで長文まとめるの時間かかるな、そんないい記事書けないなとアウトプットはすぐ投稿できるTwitterに逃げていましたがswitch文でQiitaデビューしようと思いました、暖かい目でご覧ください書くことmatch関数とif関数の違いpythonプログラミング言語でのswitch文の違いC言語・Ruby・VBA書かないこと言語ごとの深掘り数値の場合どうなるか等コード内容色で英語の文字列を日本語で出力変数名colorcolorがredの場合、出力は赤colorがwhiteかblackの場合、出力はパンダの色複数条件コードGitHub動作環境macOSMontereyプログラミング言語のバージョンはそれぞれに記載caseとifの違いpythonpythonではmatchとなり、変数colorの中身によって処理を切り替える。	2022-01-16 00:38:50
AWS	AWSタグが付けられた新着投稿 - Qiita	【CloudFront】キャッシュ期間をフロー図っぽくしただけ	https://qiita.com/ItsukiN32/items/36e5573228f9a7c435dc	cloudfront	2022-01-16 00:49:05
AWS	AWSタグが付けられた新着投稿 - Qiita	Codebuild の buildspec.yaml	https://qiita.com/leomaro7/items/1eca2b814930f98f3ff9	secondaryartifactsを利用して、複数のビルド出力アーティファクトを指定することも可能。	2022-01-16 00:03:29
海外TECH	Ars Technica	The weekend’s best deals: HBO Max, new AirPods, Apple Watch Series 7, and more	https://arstechnica.com/?p=1825888	airpods	2022-01-15 15:26:01
海外TECH	MakeUseOf	What Are Easter Eggs in Video Games?	https://www.makeuseof.com/what-are-easter-eggs-in-video-games/	common	2022-01-15 15:30:33
海外TECH	MakeUseOf	What Is the Best Focal Length for Street Photography?	https://www.makeuseof.com/best-focal-length-street-photography/	photographers	2022-01-15 15:15:12
海外TECH	DEV Community	Reverse Each word in a String	https://dev.to/sureshayyanna/reverse-each-word-in-a-string-1868	Reverse Each word in a StringProgram to Reverse each word in Stringpackage InterviewPrograms import java util Scanner public class ReverseEachWord Method public static String revWordsOfString String str s Split the String with whitespace String words str split s Using for each loop read each word and reverse it String revstr for String w words String revword for int i w length i gt i revword revword w charAt i revstr revstr revword return revstr Method public static String revWordOfString String str s Split the String with Space Reg Expression s String word str split s String revword for String w word StringBuilder sb new StringBuilder w sb reverse revword revword sb toString return revword public static void main String args System out println Enter the Actual String Scanner input new Scanner System in String actualString input nextLine String ExpectedString revWordsOfString actualString System out println The Reverse word of each string of given String from Method ExpectedString System out println The Reverse word of each string of given String from Method revWordOfString actualString	2022-01-15 15:36:55
海外TECH	DEV Community	When to use the useCallback hook ?	https://dev.to/thenerdydev/when-to-use-the-usecallback-hook--50f7	When to use the useCallback hook Hey everyone In this article let us learn about a very special React Hook called as the useCallback hook and understand how and when to use it This article was first published on Check the website for more interesting articles and tutorials on Web Development What is the useCallback hook useCallback is a React Hook which was introduced to prevent re creation of a specific function in case our component re renders It does so by memoizing the callback function that this hook takes and this memoized version will only change when one of the inputs has changed This is useful when passing callbacks to optimized child components that rely on reference equality to prevent unnecessary renders So typically we should make use of the useCallback hook in one of the following cases If you are passing the function on to child component as props and the child component doesn t often need re rendering except when a certain prop change then useCallback might prevent certain re renders You are specifying a function as a dependency to useEffect In such a case you must ensure that the function is not recreated on every render or the useEffect will be triggered on every render So in the essence the decision to make use of the useCallback must be made judiciously instead of blindly since you might just overdo the advantage offered by useCallback and end up degrading the performance since useCallback will also memoize the functions and a frequently changing dependency might anyways need to recreate the function If the dependencies of the useCallback change only then the function will get recreated otherwise it will use the exact one and the same instance of that function across the re renders Example In JavaScript we know that when a function gets executed we know that each and every thing variables functions objects etc that is present within the function gets re created into the memory So this happens on each execution of the function Now for a function we might not want it to get re created on each re render of the component and in turn we may want to use the exact same instance for that specific function in each of our renders We might only want to re create the function when a specific dependency which that function uses gets changed and NOT otherwise This is something that we can achieve by making use of the useCallback hook Let s see a simple Counter component Here we have a single piece of state which we call as counter and we have a corresponding state updating function for it which we named as setCounter The initial value for counter is given as Next we have a handleIncrement counter function and all it does is that it increments the value of counter by const Counter gt const counter setCounter useState const handleIncrement gt setCounter counter return lt div gt Counter counter lt br gt lt button onClick handleIncrement gt Increment lt button gt lt div gt Now the interesting thing to note here is that the handleIncrement function will get re created on each render of the component This means that each time the component re renders handleIncrement function will get re created at a separate spot in memory And due to this reason when React tries to make a referential equality comparison it finds a change because of the re creation of the handleIncrement function Now what if we wrap this with the useCallback hook What the useCallback does is that it internally caches the first created version of the function and returns it to the caller if the listed dependencies haven t changed In case the listed dependencies does change then it automatically gives us a new instance of that function So if we introduce the useCallback hook into our above code then our code should look something like this const Counter gt const counter setCounter useState const handleIncrement React useCallback gt setCounter counter return lt div gt Counter counter lt br gt lt button onClick handleIncrement gt Increment lt button gt lt div gt Now with the above code what React will do is that it will cache the handleIncrement function internally and will make sure to return the exact same instance of the function in case no external dependencies of the useCallback have changed In case the external dependencies do change then in that case a brand new instance of the handleIncrement function will get created for us For our case there are no external dependencies for the handleIncrement function Now caching the function internally by using the useCallback has its own cons The cached instance of the function call will not have direct access to the variables of our current function call Instead of that it will have visibility of the variables that were introduced in the initial closure call where the stored function was created So in essence this means that our call will not work for the updated variables Therefore we need to specify those variables or dependencies of the function that can change The list of dependencies is to be passed as the second argument of the useCallback In our example we need to tell to useCallback function that we need a fresh version of our counter variable on each call If we don t do that then the counter variable after the call will always be and this is what comes from the original value plus const Counter gt const counter setCounter useState const handleIncrement React useCallback gt setCounter counter counter return lt div gt Counter counter lt br gt lt button onClick handleIncrement gt Increment lt button gt lt div gt The above version of code will not re render on every call So this is it for this article Thanks for reading If you enjoy my articles consider following me on Twitter for more interesting stuff Twitter Don t forget to leave a like if you loved the article Also share it with your friends and colleagues PS If you are looking to learn Web Development I have curated a FREE course for you on my YouTube Channel check the below article Web Developer Full Course HTML CSS JavaScript Node js and MongoDB The Nerdy Dev・Apr ・ min read html css node javascript Looking to learn React js with one Full Project check this out Learn React with one BIG Project NOTES included Demo and Video Link The Nerdy Dev・Jun ・ min read daysofcode javascript react webdev	2022-01-15 15:36:22
Apple	AppleInsider - Frontpage News	Best deals Jan. 15: $250 off iRobot Roombas, $98 Adata 1TB NVMe, $60 Razer Kiyo, more!	https://appleinsider.com/articles/22/01/15/best-deals-jan-15-250-off-irobot-roombas-98-adata-1tb-nvme-60-razer-kiyo-more?utm_medium=rss	Best deals Jan off iRobot Roombas Adata TB NVMe Razer Kiyo more Saturday s best deals include off iRobot Roombas a inch Acer WQHD monitor for and the Razer Kiyo webcam for Best Deals for January Following the chaos of the January sales we ve collected some of the best deals we could find on Apple products tech accessories and other items for the AppleInsider audience Read more	2022-01-15 15:04:58
海外TECH	Engadget	Tesla reportedly delays Cybertruck production to 2023	https://www.engadget.com/tesla-cybertruck-production-production-2023-152051543.html?src=rss	Tesla reportedly delays Cybertruck production to Tesla has once again quietly pushed back its Cybertruck s release to next year according to Reuters The automaker will reportedly begin the electric truck s production by the end of the first quarter of instead of this year While Tesla has yet to formally announce the delay the Cybertruck s order page removed a previous reference to production in The design section of the page previously read quot You will be able to complete your configuration as production nears in quot Now the sentence ends after the word quot nears quot nbsp Back in November somebody on Twitter asked company chief Elon Musk for an update on the Cybertruck Musk responded that Tesla has been grappling with a quot supply chain nightmare quot and that he ll provide more updates during the company s next earnings call scheduled for January th Oh man this year has been such a supply chain nightmare amp it s not over I will provide an updated product roadmap on next earnings call ーElon Musk elonmusk November According to Reuters source Tesla will have a limited production of the Cybertruck at first before increasing its output The company unveiled the Cybertruck in at a big event wherein Musk said that production was slated to begin in late During the company s January earnings call he said Tesla only expects a few deliveries in and for volume production to start in Later that year though the company delayed the vehicle s release to nbsp Delays with Tesla releases don t come as a surprise anymore seeing as Musk is known for announcing timetables that are a bit too optimistic Supply chain and component shortages brought about by the pandemic may have also contributed to the delay if Reuters report turns out to be true We ll find out for sure when Tesla reveals its updated product roadmap before the month ends	2022-01-15 15:20:51
海外ニュース	Japan Times latest articles	Tsunami strikes Japan following Tonga eruption	https://www.japantimes.co.jp/news/2022/01/16/%news_category%/japan-tsunami-tonga-volcano/	coast	2022-01-16 00:58:13
ニュース	BBC News - Home	Prince Andrew's lawyers say accuser may have false memories	https://www.bbc.co.uk/news/uk-60005128?at_medium=RSS&at_campaign=KARANGA	psychologist	2022-01-15 15:17:13
ニュース	BBC News - Home	Marmite-owner Unilever bids for GSK's consumer arm	https://www.bbc.co.uk/news/business-60009645?at_medium=RSS&at_campaign=KARANGA	london	2022-01-15 15:41:34
ニュース	BBC News - Home	Tottenham v Arsenal: North London derby postponed because of player absences	https://www.bbc.co.uk/sport/football/60003930?at_medium=RSS&at_campaign=KARANGA	Tottenham v Arsenal North London derby postponed because of player absencesArsenal s north London derby against Tottenham on Sunday is postponed because the Gunners do not have enough available players to field a side	2022-01-15 15:04:31
サブカルネタ	ラーブロ	純手打ち だるま＠中野富士見町　「醤油らーめん」	http://ra-blog.net/modules/rssc/single_feed.php?fid=195592	中野富士見町	2022-01-15 15:01:19
海外TECH	reddit	Tsunami warning	https://www.reddit.com/r/japanlife/comments/s4mmr1/tsunami_warning/	Tsunami warningJMA has issued a Tsunami warning spanning from Hokkaido to Okinawa Amami Okinawa is predicted to be meters the rest meter Stay informed incase things change Edit it will hit So evacuate to higher than the predicted hight of the tsunami Don t be close to the sea submitted by u pancakepepper to r japanlife link comments	2022-01-15 15:26:02
海外TECH	reddit	【速報】奄美群島・トカラ列島で津波警報 予想高さ ３ｍ	https://www.reddit.com/r/newsokunomoral/comments/s4mi37/速報奄美群島トカラ列島で津波警報_予想高さ_３ｍ/	wsokunomorallinkcomments	2022-01-15 15:20:09