投稿時間:2022-08-15 22:34:12 RSSフィード2022-08-15 22:00 分まとめ(41件)

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python	Pythonタグが付けられた新着投稿 - Qiita	【Python】競プロ用テンプレート（VS Codeユーザースニペット機能）	https://qiita.com/rapirapi/items/1e868cea4afb82445540	vscode	2022-08-15 21:58:11
python	Pythonタグが付けられた新着投稿 - Qiita	Pythonで画像をメモリ上でJPEG圧縮・展開する（たぶん）正しい方法	https://qiita.com/tttamaki/items/69d7a72806b7e4bd0e39	npndarray	2022-08-15 21:12:16
Ruby	Rubyタグが付けられた新着投稿 - Qiita	Rubyで可変長配列を実装する	https://qiita.com/masayasviel/items/128bc19a43a4402e548f	shiftunshiftpushpop	2022-08-15 21:54:33
AWS	AWSタグが付けられた新着投稿 - Qiita	AWS周りのツール一覧	https://qiita.com/hntk/items/8379bdada2cb530678a4	適宜	2022-08-15 21:57:36
AWS	AWSタグが付けられた新着投稿 - Qiita	初めてのWAFの導入時に参考にした記事たち	https://qiita.com/yokoo-an209/items/de7fe42a1f70f5575c9c	記事	2022-08-15 21:24:35
golang	Goタグが付けられた新着投稿 - Qiita	【#51 エンジニア転職学習】goqueryを使用したスクレイピング	https://qiita.com/Chika110/items/9cd4c9c4a7ba55c6986f	chika	2022-08-15 21:54:56
海外TECH	MakeUseOf	How to Choose Headlights for Your Automobile	https://www.makeuseof.com/how-choose-headlights-for-automobile/	headlight	2022-08-15 12:15:14
海外TECH	MakeUseOf	Govee Cuts Down Prices With Back to School Promo	https://www.makeuseof.com/govee-back-to-school-promo/	promotion	2022-08-15 12:10:14
海外TECH	DEV Community	Create a Amazing Movie Website Using HTML CSS Javascript	https://dev.to/codewithsadee/create-a-amazing-movie-website-using-html-css-javascript-28c9	Create a Amazing Movie Website Using HTML CSS JavascriptHow to build a responsive movie website using html css javascriptIn this video I will show you how to build a mobile first responsive movie website using html css and javascript Live WebsiteGithub RepoHI I m Sadee webdev In this channel I make videos about Complete Responsive website You can checkout my channel My Channel codewithsadeeSubscribe subscribe now Essential linksDownload the starter file to practice ️Timestamps Demo File structure Project initial Header Hero section Upcoming movie section Service section Top rated movie section Tv series section CTA section Footer Movie detail page Media queries	2022-08-15 12:45:34
海外TECH	DEV Community	✨️✨️✨️Tell me something that you achieved this year, that wasn't initially part of your goals? ✨️✨️✨️🦄🦄	https://dev.to/monicafidalgo/tell-me-something-that-you-achieved-this-year-that-wasnt-initially-part-of-your-goals-2a48	goals	2022-08-15 12:32:56
海外TECH	DEV Community	12 Things EVERY JavaScript Developer Should Know 🕛	https://dev.to/dcodeyt/12-things-every-javascript-developer-should-know-4dk3	Things EVERY JavaScript Developer Should Know There s no better feeling than mastering a programming language In today s post we ll explore things you should know if you re serious about JavaScript includes Over indexOf Rather than checking for to see if an array contains the given element try using includes instead which returns a clean true or false const numbers const containsEight numbers includes containsEight true Using the defer AttributeIf you include your lt script gt tag at the end of your lt body gt tag it s time to stop Seriously Instead place your lt script gt tag in your lt head gt and use the defer attribute This will load the script asynchronously speed and more importantly only execute the script once the document has finished parsing lt DOCTYPE html gt lt html gt lt head gt lt title gt Subscribe to dcode on YouTube lt title gt lt script src js main js defer gt lt script gt lt head gt lt html gt const Over letThis is one of my favourites Guess what I hardly ever use let because in most cases you don t need to let should only be used when you know a variable will be reassigned in other words using the sign In all other cases use const const myButton document getElementById myButton const numbers NOT reassignmentmyButton appendChild someOtherDiv NOT reassignment It s a method callnumbers push Template Literals Strings If you re trying to build up strings dynamically there s almost never a reason to use s or s as of recent years Instead build strings in a clean manner using template literals backtick const hour const minute const amPm pm const time It is minute minute s past amPm time It is minute s past pm Logical OR for DefaultsMost of you may already know this one but it surprises me how often I don t see it being used Let me keep it simple Replace this let username localStorage getItem username Can t find username use a defaultif username username Unknown With this const username localStorage getItem username Unknown Not only is it a single line of code you also use const over let Using classList Over classNameWhat if I told you there was a smart way to interact with the classes on an HTML element Well you can with classList Let s have a look at a few examples const myButton document getElementById myButton Add a classmyButton classList add color primary Remove a classmyButton classList remove is disabled Toggle a classmyButton classList toggle visible Check if a class existsmyButton classList contains border Replace a classmyButton classList replace color warn color success Object DestructuringJavaScript offers an intelligent way to take values from an object and reference them as variables or parameters it s done through object destructuring const person name Dom age occupation Software Developer country Australia Take the name and country from the person objectconst name country person Dom is from Australiaalert name is from country And with function parameters function showMessage name country alert name is from country showMessage person Array DestructuringSimilar to object destructuring JavaScript offers the same thing for arrays but it works through the index of an element const color const red green blue color Array map This is probably one of the most under used methods of JavaScript It s called map and is used to transform the elements of an array Let s take this numbers array and create a new array which each number doubled const numbers const doubled numbers map number gt return number This code is really simple we pass a function into the map method and it will run for each element in an array The return value of this function is the new value for that element in the array Element closest PAY ATTENTION because this DOM method is my favourite It comes handy very often especially when building user interfaces or using a third party library This method gives you context of a child element s parent element by searching up the DOM tree until it finds an ancestor matching the given selector In the example below we are within a click event but we don t know where the event target element that was clicked on is in the document someUnknownButton addEventListener click e gt const container e target closest container The DOM tree might look like this lt div id app gt lt div class container gt lt div class float right gt lt button gt Click lt button gt lt div gt lt div gt lt div class container gt lt ️end up here gt lt div class float right gt lt button gt Click lt button gt lt CLICKED gt lt div gt lt div gt lt div class container gt lt div class float right gt lt button gt Click lt button gt lt div gt lt div gt lt div gt Fetch API Over AJAXIt s time to stop using AJAX Use fetch for your client side HTTP requests instead it s a modern way to fetch data from your backend or API As a bonus you ll also get comfortable with promises Let s see how we can use fetch over a traditional jQuery AJAX request jQuery AJAX get data users json function users console log users Fetch APIfetch data users json then response gt return response json then users gt console log users The Fetch API does look a little more complicated but it s native to the browser avoids callback hell and gives you easy access to the response object to check status codes content type etc ️ Async AwaitMany developers are afraid to jump into the world of async await but trust me give it a good shot it really isn t too complicated To put it simply async await offers you an alternative way to deal with promises You can avoid the verbose then syntax and make your code look more sequential Let s have a nd look at the previous Fetch API code example but using async await over then async function fetchAndLogUsers const response await fetch data users json const users await response json console log users You can see here the await keyword breaks up each then and if you wanted to you can use try catch to handle errors as opposed to catch Video GuideTo see this post in video form have a look on my YouTube channel dcode JavaScript DOM Crash CourseYou can find a complete course on the JavaScript DOM which goes over some of the topics covered in this post at the link below Keep learning	2022-08-15 12:05:14
海外TECH	DEV Community	🔥Top 11 Mistakes to Avoid When Using React In 2022	https://dev.to/chris1993/top-11-mistakes-to-avoid-when-using-react-in-2022-2ca6	Top Mistakes to Avoid When Using React In As React becomes more and more popular more and more React developers have encountered various problems in the development process In this article based on my actual work experience I will summarize some common mistakes in React development to help you avoid some mistakes If you are just starting to use React it is recommended that you take a good look at this article If you have already used React to develop projects it is also recommended that you check and fill in the gaps After reading this article you will learn how to avoid these React mistakes When rendering the list do not use the keyModify the state value directly by assignmentBind the state value directly to the value property of the inputUse state directly after executing setStateInfinite loop when using useState useEffectForgetting to clean up side effects in useEffectIncorrect use of boolean operatorsThe component parameter type is not definedPassing Strings as Values to ComponentsThere is no component name that starts with a capital letterIncorrect event binding for element When rendering the list do not use the key ProblemWhen we first learned React we would render a list according to the method described in the documentation for example const numbers const listItems numbers map number gt lt li gt number lt li gt After rendering the console will prompt a warning ️a key should be provided for list items SolutionsYou just need to follow the prompts and add the key attribute to each item const numbers const listItems numbers map number index gt lt li key index gt number lt li gt key helps React identify which elements have changed such as been added or removed So we need to set a unique key value for each element in the array DocumentationReact Basic List Component Modify the state value directly by assignment ProblemIn React state cannot be directly assigned and modified otherwise it will cause problems that are difficult to fix Example updateState gt this state name Chris At this point the editor will prompt a warning ️ Do not mutate state directly Use setState SolutionsClass components can be modified with the setState method and function components can be modified with useState ClassComponent use setState this setState name Chris FunctionConponent use useState const name setName useState setName Chris DocumentationReact State and LifecycleReact Using the State Hook Bind the state value directly to the value property of the input ProblemWhen we directly bind the value of state as a parameter to the value property of the input tag we will find that no matter what we enter in the input box the content of the input box will not change export default function App const count setCount useState return lt input type text value count gt This is because we use the state variable with state as the default value to assign to the value of lt input gt and the state in the functional component can only be modified by the set method returned by useState So the solution is also very simple just use the set method when modifying SolutionsJust bind an onChange event to lt input gt and modify it by calling setCount export default function App const count setCount useState const change val gt setCount val value return lt input type text value count onChange change gt Use state directly after executing setState ProblemWhen we modify the data through setState and get the new data immediately there will be a situation where the data is still the old data init state datathis state name Chris update state datathis setState name Hello Chris console log this state name output ChrisWe might think that the this state name entered at this point should be Hello Chris but it turns out to be Chris This is because setState is asynchronous When setState is executed the real update operation will be placed in the asynchronous queue for execution and the code to be executed next ie console log this line is executed synchronously so the state printed out is not the latest value SolutionsJust encapsulate the subsequent operation to be performed as a function as the second parameter of setState this callback function will be executed after the update is completed this setState name Hello Chris gt console log this state name output Hello Chris The correct content is now output Infinite loop when using useState useEffect ProblemWhen we directly call the set method returned by useState in useEffect and do not set the second parameter of useEffect we will find an infinite loop export default function App const count setCount useState useEffect gt setCount count return lt div className App gt count lt div gt At this time you can see that the data on the page has been increasing and useEffect has been called infinitely entering an infinite loop state SolutionsThis is a common problem of using useEffect incorrectly useEffect can be regarded as a combination of the three lifecycle functions componentDidMount componentDidUpdate and componentWillUnmount in class components useEffect effect deps takes arguments effect side effect function deps array of dependencies When the deps array changes the side effect function effect is executed To modify the method you only need to pass in the second parameter of useEffect export default function App const count setCount useState useEffect gt setCount count return lt div className App gt count lt div gt To summarize the cases where useEffect is used Do not set the second parameter When any state is updated the side effect function of useEffect will be triggered useEffect gt setCount count The second parameter is an empty array The side effect function of useEffect is only triggered on mount and unmount useEffect gt setCount count The second parameter is a single valued array The side effect function of useEffect will be triggered only when the value changes useEffect gt setCount count name The second parameter is a multi valued array The side effect function of useEffect will only be triggered when the passed value changes useEffect gt setCount count name age Forgetting to clean up side effects in useEffect ProblemIn class components we use the componentWillUnmount lifecycle method to clean up some side effects such as timers event listeners etc SolutionsA return function can be set for the side effect function of useEffect which is similar to the role of the componentWillUnmount lifecycle method useEffect gt Other Code return gt clearInterval id name age DocumentationReact Example Using Hooks Incorrect use of boolean operators ProblemIn JSX TSX syntax we often use boolean values to control rendered elements and in many cases we use the amp amp operator to handle this logic const count const Comp gt count amp amp lt h gt Chris lt h gt We thought that the page displayed empty content at this time but it actually displayed the content of on it SolutionsThe reason is because the falsy expression causes elements after amp amp to be skipped but returns the value of the falsy expression So we try to write the judgment condition as complete as possible without relying on the true and false of JavaScript s boolean value to compare const count const Comp gt count gt amp amp lt h gt Chris lt h gt The page will display empty content DocumentationReact Inline If with Logical amp amp Operator The component parameter type is not defined ProblemIt is common for team development If the components developed by each person do not have well defined parameter types it is easy for cooperating colleagues to not know how to use the components which is very troublesome such as const UserInfo props gt return lt div gt props name props age lt div gt SolutionsSolutions areUsing TypeScript define component props types ClassComponentinterface AppProps value string interface AppState count number class App extends React Component lt AppProps AppStore gt FunctionComponentinterface AppProps value string const App React FC lt AppProps gt value children gt Without using TypeScript props types can be defined using propTypes const UserInfo props gt return lt div gt props name props age lt div gt UserInfo propTypes name PropTypes string isRequired age PropTypes number isRequired Passing Strings as Values to Components ProblemSince React also has a template syntax which is very similar to HTML it often happens that numbers are passed directly to components as props resulting in an unexpected value judgment lt MyComp count gt lt MyComp gt Passing props count in the MyComp component will return false SolutionsThe correct way should be to use curly brackets to pass parameters lt MyComp count gt lt MyComp gt There is no component name that starts with a capital letter ProblemDevelopers just starting out often forget to start with a capital letter for their component names Components starting with a lowercase letter in JSX TSX are compiled into HTML elements such as lt div gt for HTML tags class myComponent extends React component SolutionsJust change the first letter to uppercase class MyComponent extends React component DocumentationReact Rendering a Component Incorrect event binding for element Problemimport Component from react export default class HelloComponent extends Component constructor super this state name Chris update this setState name Hello Chris render return lt div gt lt button onClick this update gt update lt button gt lt div gt When clicking the update button the console will report an error Cannot read properties of undefined reading setState SolutionsThis is because this points to the problem and there are several solutions bind in the constructorconstructor super this state name Chris this update this update bind this Use arrow functionsupdate gt this setState name Hello Chris Bind in the render function not recommended create a new function every time the component renders affecting performance lt button onClick this update bind this gt update lt button gt Use arrow functions in the render function not recommended create a new function every time the component renders affecting performance lt button onClick gt this update gt update lt button gt DocumentationReact How do I pass an event handler like onClick to a component If you think this article is good please like comment and follow your support is the biggest motivation for me to share Chris	2022-08-15 12:01:00
Apple	AppleInsider - Frontpage News	Daily Deals August 15: Refurbished M1 iMacs, $110 off Apple Watch Series 7, $70 Blue Yeti Nano, more	https://appleinsider.com/articles/22/08/15/daily-deals-august-15-refurbished-m1-imacs-110-off-apple-watch-series-7-70-blue-yeti-nano-more?utm_medium=rss	Daily Deals August Refurbished M iMacs off Apple Watch Series Blue Yeti Nano moreMonday s best deals include the AirTag Leather Key Ring for a Philips Hue lighting pack for Bowers Wilkins ANC wireless headphones for and much more Best deals for August AppleInsider checks online stores daily to uncover discounts and offers on hardware and other products including Apple devices smart TVs accessories and other items The best offers are compiled into our regular list for our readers to use and save money Read more	2022-08-15 12:14:29
海外TECH	Engadget	Apple's M2-powered MacBook Air is $100 off at Amazon	https://www.engadget.com/apples-m2-powered-macbook-air-is-100-off-at-amazon-123628810.html?src=rss	Apple x s M powered MacBook Air is off at AmazonApple s MacBook Air M may not have completely reshaped the PC landscape like the M laptop did but it s arguably the best version of the notebook to date It earned a score of from us and it would make a solid daily driver for anyone from college students to working professionals One of the few downsides is that the M laptop is more expensive than its predecessor but now you can grab one for less than usual from Amazon The online retailer has the GB MacBook Air M in starlight for which is the best price we ve seen since launch Buy MacBook Air M GB at Amazon The latest MacBook Air actually has a slightly different design than previous models Apple moved away from the wedge shape and made the new laptop uniformly thin making looking more like the inch and inch MacBook Pros Apple managed to increase the side of the Liquid Retina screen to inches by shrinking the surrounding bezels and while that s only a third of an inch bigger than previous displays it has a more expansive feel It also has the relatively new top notch that holds the machine s webcam On top of that you re getting improved speakers and a handy MagSafe power adapter in the Air M s new design Overall it feels just updated enough to make a difference in daily use but not so much that it will feel foreign to Apple diehards As for performance the MacBook Air M handled everything we threw at it The M chipset builds upon the stunningly fast foundation that the M processor provided last year so you can expect a roughly percent performance increase If you spring for the faster GPU version you ll get a percent faster graphics than in the M model We found the M to be just as fast as the inch MacBook Pro M so if you ve been looking for a powerful new laptop but would like to keep things as thin and light as possible you won t be sacrificing much by opting for the Air M over the Pro The Air M s battery life is even pretty close to that of the inch Pro ーthe Air lasted about hours in our testing while the Pro lasted just over hours Follow EngadgetDeals on Twitter and subscribe to the Engadget Deals newsletter for the latest tech deals and buying advice	2022-08-15 12:36:28
Cisco	Cisco Blog	Design Thinking and Visual Storytelling: New Trainings for Cisco Partners	https://blogs.cisco.com/innovation/design-thinking-and-visual-storytelling-new-trainings-for-cisco-partners	Design Thinking and Visual Storytelling New Trainings for Cisco PartnersThis post was written together with Andrew Krueger Business Architecture Global Program Lead The third stage of Cisco s Business Architecture BA Training was first introduced to partners in It was later retired to undergo a complete rewrite the objective was to integrate Cisco s latest tools and methodologies practiced by Business Architects globally We have	2022-08-15 12:50:35
海外科学	NYT > Science	U.K. Approves Covid Booster Vaccine That Targets Two Variants	https://www.nytimes.com/2022/08/15/health/uk-covid-booster-variants.html	U K Approves Covid Booster Vaccine That Targets Two VariantsThe vaccine which has been approved for adults generated a strong immune response against both the original virus and the Omicron variant	2022-08-15 12:27:37
金融	JPX マーケットニュース	[東証]監理銘柄（確認中）の指定：（株）ディー・ディー・エス	https://www.jpx.co.jp/news/1023/20220815-12.html	監理銘柄	2022-08-15 22:00:00
金融	金融庁ホームページ	鈴木財務大臣兼内閣府特命担当大臣初閣議後記者会見の概要（令和４年８月10日）を掲載しました。	https://www.fsa.go.jp/common/conference/minister/2022b/20220810-2.html	内閣府特命担当大臣	2022-08-15 12:02:00
海外ニュース	Japan Times latest articles	Congress forces Biden toward risky face-off with China over Taiwan	https://www.japantimes.co.jp/news/2022/08/15/asia-pacific/congress-taiwan-visits-biden-risk/	Congress forces Biden toward risky face off with China over TaiwanMore hawkish moves by Congress could leave the U S president with a choice of whether he would rather look weak in Washington or in Beijing	2022-08-15 21:38:19
ニュース	BBC News - Home	Keir Starmer calls for extra windfall tax to freeze energy bills	https://www.bbc.co.uk/news/business-62542541?at_medium=RSS&at_campaign=KARANGA	households	2022-08-15 12:19:38
ニュース	BBC News - Home	Thunderstorms begin in the UK after heatwave	https://www.bbc.co.uk/news/uk-62546063?at_medium=RSS&at_campaign=KARANGA	drought	2022-08-15 12:38:35
ニュース	BBC News - Home	Ryan Giggs headbutted ex and threatened her sister, court hears	https://www.bbc.co.uk/news/uk-wales-62548786?at_medium=RSS&at_campaign=KARANGA	hears	2022-08-15 12:34:26
ニュース	BBC News - Home	Ricardo Dos Santos: Sprinter pulled over for second time by police	https://www.bbc.co.uk/news/uk-england-london-62546231?at_medium=RSS&at_campaign=KARANGA	ricardo	2022-08-15 12:53:50
ニュース	BBC News - Home	European Championships: Germany's Richard Ringer sprints to gold in men's marathon	https://www.bbc.co.uk/sport/av/athletics/62551957?at_medium=RSS&at_campaign=KARANGA	European Championships Germany x s Richard Ringer sprints to gold in men x s marathonGermany s Richard Ringer comes from nowhere to win gold in the men s marathon after a sensational sprint finish at the European Championships	2022-08-15 12:34:49
ビジネス	不景気.com	第一パンの22年12月期は9億円の最終赤字へ、横浜工場閉鎖で - 不景気com	https://www.fukeiki.com/2022/08/daiichipan-2022-loss.html	最終赤字	2022-08-15 12:01:21
北海道	北海道新聞	小田急ロマンスカー値上げ　２７年ぶり、ネットは割引	https://www.hokkaido-np.co.jp/article/718084/	小田急ロマンスカー	2022-08-15 21:38:00
北海道	北海道新聞	「県の将来考えた」と釈明　大雨に香港出張の青森知事	https://www.hokkaido-np.co.jp/article/718075/	災害対策本部	2022-08-15 21:23:29
北海道	北海道新聞	戦争知らぬ世代　教訓どう継承　取材した記者５人の考え　釧路・根室	https://www.hokkaido-np.co.jp/article/718083/	釧路	2022-08-15 21:36:00
北海道	北海道新聞	スーチー氏、汚職で再び有罪　禁錮６年、ミャンマー	https://www.hokkaido-np.co.jp/article/718082/	禁錮	2022-08-15 21:35:00
北海道	北海道新聞	釧路管内１４１人感染　根室管内は３１人　新型コロナ	https://www.hokkaido-np.co.jp/article/718081/	根室管内	2022-08-15 21:32:00
北海道	北海道新聞	自宅療養者１５４万人　４週連続過去最多	https://www.hokkaido-np.co.jp/article/718080/	厚生労働省	2022-08-15 21:30:00
北海道	北海道新聞	里見、女性初のタイトル戦本戦勝利ならず　将棋棋王戦１６強逃す	https://www.hokkaido-np.co.jp/article/718058/	里見	2022-08-15 21:26:21
北海道	北海道新聞	佐藤泰志の高校時代たどる　苫小牧出身の稲塚秀孝監督が映画製作	https://www.hokkaido-np.co.jp/article/718051/	高校時代	2022-08-15 21:22:52
北海道	北海道新聞	知床で発見の頭蓋骨、ＤＮＡ鑑定へ　斜里署に引き渡し	https://www.hokkaido-np.co.jp/article/718067/	引き渡し	2022-08-15 21:20:09
北海道	北海道新聞	ＮＰＴ委、ロシアに撤退要求　占拠のザポロジエ原発	https://www.hokkaido-np.co.jp/article/718074/	核拡散防止条約	2022-08-15 21:16:00
北海道	北海道新聞	「踊るあほう」街にぎわう　徳島・阿波おどり閉幕	https://www.hokkaido-np.co.jp/article/718073/	阿波おどり	2022-08-15 21:14:00
北海道	北海道新聞	オホーツク管内１５３人感染　新型コロナ	https://www.hokkaido-np.co.jp/article/718072/	新型コロナウイルス	2022-08-15 21:11:00
北海道	北海道新聞	難病患者情報５千人分流出　厚労省、削除し忘れ	https://www.hokkaido-np.co.jp/article/718071/	指定難病	2022-08-15 21:11:00
北海道	北海道新聞	ソフトボール　五輪金の山本さん指導、一流の技体感　北見	https://www.hokkaido-np.co.jp/article/718070/	山本さん	2022-08-15 21:10:00
北海道	北海道新聞	十勝管内６８３人感染　新型コロナ	https://www.hokkaido-np.co.jp/article/718069/	十勝管内	2022-08-15 21:08:00
北海道	北海道新聞	綱引き大会、消防署がＶ　いけだ夏まつり	https://www.hokkaido-np.co.jp/article/718068/	夏まつり	2022-08-15 21:07:00