投稿時間:2022-07-03 23:20:09 RSSフィード2022-07-03 23:00 分まとめ(26件)

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python	Pythonタグが付けられた新着投稿 - Qiita	VSCodeにて仮想環境上（venv）でgitコマンドが認識されない	https://qiita.com/da-pan/items/a465634c7eb052886e26	vscode	2022-07-03 22:17:37
python	Pythonタグが付けられた新着投稿 - Qiita	Codility Lesson4 PermCheck	https://qiita.com/masato314/items/75f17b0f15293c05df14	itylessonpermchecklesson	2022-07-03 22:14:46
js	JavaScriptタグが付けられた新着投稿 - Qiita	「読みやすいコード」とは結局何なのか	https://qiita.com/noty2008/items/f2123c49982ee63c282d	結局	2022-07-03 22:31:35
js	JavaScriptタグが付けられた新着投稿 - Qiita	【JavaScript】サイズ・座標 取得チートシート(chrom)	https://qiita.com/sho_U/items/a8234132c8b2248ca01b	chrom	2022-07-03 22:08:09
AWS	AWSタグが付けられた新着投稿 - Qiita	Amazon S3 Storage Lens とは	https://qiita.com/miyuki_samitani/items/51bd73db271960668dae	amazonsstoragelens	2022-07-03 22:14:13
GCP	gcpタグが付けられた新着投稿 - Qiita	Terraform × GCP （GCSバケット作成~削除）	https://qiita.com/yyyyy__78/items/8690fe730ba15a4cbf31	clouddeploymentman	2022-07-03 22:01:31
Git	Gitタグが付けられた新着投稿 - Qiita	VSCodeにて仮想環境上（venv）でgitコマンドが認識されない	https://qiita.com/da-pan/items/a465634c7eb052886e26	vscode	2022-07-03 22:17:37
Git	Gitタグが付けられた新着投稿 - Qiita	【#18 エンジニア転職学習】Git/Github基礎　ブランチ/コンフリクト	https://qiita.com/Chika110/items/9660243f02f4cfebe440	chika	2022-07-03 22:07:39
海外TECH	DEV Community	Struggling with Promises? You Are Not Alone!	https://dev.to/polymathsomnath/struggling-with-promises-you-are-not-alone-530g	Struggling with Promises You Are Not Alone Do you like to cook I m not sure about you but I enjoy cooking I usually cook by myself although I m not opposed to having some help Many times you ll find yourself in a situation where you will need something in the middle of cooking and that damn thing isn t in your house and you have to ask someone to get it for you while you re cooking In the meantime you keep doing your job You may be familiar with this way of doing things ーin programming languages ーwe refer to it as asynchronous We often do things asynchronously in programming That is we initiate something and before even it completes we initiate some other task In JavaScript we rely a lot on asynchronous operations ーwhose results we don t have yet but will at some later point JavaScript in itself is not asynchronous but it supports asynchronous programming ES has introduced an idea that makes handling asynchronous tasks easier Promises A promise is an object ーa placeholder for the eventual result It is not that we could not do the async operation before We did All we had to do is to make use of Callbacks in a certain way Doing so was a torture when we needed to do a task when our operation failed Promises standardized the way to deal with asynchronous events and callbacks I ve seen people struggling with promises This post aims to assist individuals in comprehending this amazing topic We will endeavour to gain a proper mental model of promises through real life examples The more you struggle to understand the less you understand any problem To understand the mind must be quiet ーJiddu KrishnamurtiSince people forget things but remember stories Let us understand promises with this little storyI am not yet a master storyteller However the preceding scenario contains all of the necessary information to help you comprehend the concepts of Promises Let us take the key points from it and apply them to JavaScript World We need a standard description of what a Promise is ーnothing better than MDN Let us see how this definition relates to our story The definition makes a lot more sense now In JavaScript a Promise is just an object It is a placeholder for a value we do not have right now but will have later It ensures that we will eventually know the result of an asynchronous operation Circumstances do not matter ーonly your state of being matters ーwhat state of being are you choosing A promise is nothing more than an object and it is usual for objects to retain a state By modifying the state we do many complex tasks in programming A promise is always in one of the three states pending which is the initial state ーthat is neither fulfilled nor rejected fulfilled meaning that the operation was completed successfully rejected meaning that the operation failed Let us establish a strong mental model by tying the underlying principles to our tale before diving into the code How to work with promises If we want to use promise in our code then we must first understand these three fundamental concepts How a to create Promise How to Fulfil or Reject a Promise How to Run a Callback Function ーDepending on Whether the Promise Is Resolved or Rejected “It is not the answer that enlightens but the question ーEugene IonescoIf you understand these three things dealing with promises will be a breeze Let s take a look at each one individually How to create a Promise We create an instance of a promise using the new keyword with the promise constructor function How to fulfill or reject the promise The promise constructor function accepts one function as its argument ーlet us pass in an arrow function but we could just as easily use a function expression This function is called an executor function it automatically receives two arguments resolve and reject Keep in mind ーresolve and reject both are functions resolve is a function which when called changes the status of the promise from pending to fulfilled reject is a function which when called changes the status of the promise from pending to rejectedIt is important to keep in mind you cannot directly mutate the status of a promise ーyou can call the resolve function to fulfill the promise or the reject function to reject the promise Both these functions are typically called after an async operation To keep things simple let s use setTimeout to simulate the time it takes to search for the Tofu We ll assume that it takes your pal five minutes to go out and text you back We refactored our code to include the setTimeout function If we get the Tofu ーwe will call resolve after five minutes if we can not get the Tofu ーwe call reject after five minutes This is pretty much how you fulfill or reject a promise How to Run a Callback Function ーDepending on Whether the Promise Is Resolved or Rejected The final step is to understand how to execute callback functions based on a promise s state change Remember that callback functions are functions that are supplied as an argument to another function Callback function means that we will use that function as an argument to another function Let us define two callback functions ーonFulfilled and onFailureonFulfilled is the function to be called if resolve is called after the async operationonFailure is the function to be called if reject is called after the async operation Ideally there would be more code in your callback functions but we simply log into the console and it serves the purpose Going back to our analogy if we found the Tofu then our promise is fulfilled ーwe want to set up the table to eat If the couldn t find the Tofu then our promise is rejected ーwe have to start cooking the pasta You may be wondering how to make use of these two callback functions When we create a new promise using the promise constructor function the promise object gives us access to two methods ーthen and catch We can call it using promise then and promise catch The important bit here is If the status of the promise changes from pending to fulfilled by calling the resolve function ーthe function that is passed to then function will automatically get invoked If the status of the promise changes from pending to rejected by calling the reject function the function that is passed to catch function will automatically get invokedIn our case we need to pass onFulfilled function to then onFailure function to catch Both functions are callback functions since they are supplied as arguments to other functions I m reminding you of this repeatedly since I ve seen many individuals get afraid of the term “callback ーthere is nothing to fear ーthey are just regular functions Our promise code works as expected But there is room for improvement What if we want to send out some data when resolving or rejecting a promise That way inside our callback functions we can make use of the value to do something else Well it turns out that we can do that by passing an argument to resolve or reject for the resolve function we ll pass in a string that says Got the Tofu for reject function we will pass in a string that says Can t get TofuBut how do we access these strings in our callback function Well the great thing about a promise is that it will automatically inject the argument passed to resolve as the argument to the onFulfilled callback and the argument passed to reject as the argument to the onFailure callback You can see that I ve included parameters to both these callbacks and simply log them to the console We would now see the output Got the Tofu Set up the table when the promise is fulfilled or if there is an error and hence a rejection we would see Can t get Tofu Cook pasta One great example of using promises is fetching data from a server we promise that we ll eventually get the data but there s always a chance that problems will occur In a practical scenario things will be different Your result would be an object JSON an array or any other data type that your async operation returns Essential this his pretty much is the fundamentals of promises in JavaScript There are a few more details which we will understand in the next article “A promise means everything but once it gets broken sorry means nothing ーanonymous Summary A promise is an object ーa placeholder for the eventual result In past we used Callbacks to perform the async operation Using callback was a pain especially when you needed to do error handling Promises standardized the way to deal with asynchronous events and Callbacks A promise is always in one of three states pending the first fulfilled or rejected The operation was completed was marked as fulfilled The operation was rejected which means it failed We create a promise using the new keyword with the promise constructor function You cannot directly mutate the status of a promise ーyou can call the resolve function to fulfill the promise or the reject function to reject the promise We learned How a Promise is created How to Fulfil or Reject a Promise How to Run a Callback Function ーDepending on Whether the Promise Is Resolved or Rejected Note of GratitudeI wanted to take this last opportunity to say thank you Thank you for being here I would not be able to do what I do withoutpeople like youwho follow along and take that leap of faith to read my post I hope you ll join me in my future blog post and stick around because I think we have something great here And I hope that I will be able to help you along in your career for many more years to come See you next time Bye	2022-07-03 13:19:09
海外TECH	DEV Community	Coding a Toggle switch with React.js and Material UI	https://dev.to/bekbrace/coding-a-toggle-switch-with-reactjs-and-material-ui-578d	Coding a Toggle switch with React js and Material UIHey codershope you re having an amazing day I enjoy coding and learning especially when I know that I can share my experience with my friends on the internet so that s why I have coded this very simple minimalist home page with React and Material UI but I guess what I wanted to achieve is creating a toggle switch for light and dark mode something that you can see now in modern websites for readers who prefer to not be bothered by the flashing light like myself so this switch provides the option to change the page s color to black and font automatically is converted to white I think it s cool and even cooler to know how you can do it in react I did not create a component as this was the only component in the app usually i create components when I have more than one element I want to integrate them but you can optimize the code as you like This is the video and I hope you will enjoy it Follow me on twitter and Instagram BekBraceJoin my Facebook page bekbraceinc	2022-07-03 13:18:39
海外TECH	DEV Community	Cleaner imports with aliases in react and typescript ✨✨	https://dev.to/mliakos/cleaner-imports-with-aliases-in-react-and-typescript-1bcl	Cleaner imports with aliases in react and typescript The problem with relative importsAs a project s been growing you might ve found yourself making imports like this import someUtil from src utils import defaultExport SomeModule from src modules dummy module This can quickly get out of hand resulting in many chaotic imports from some deeply nested folders This would get a lot cleaner if we could do something like this import someUtil from utils import defaultExport SomeModule from dummy module We essentially mapped to src folder and dummy module to src modules dummy module folder which allowed us to reference them directly using their alias Configuring aliased imports TypeScript configurationIn order for TypeScript to become aware of our alias paths we must define them inside our tsconfig json file under compilerOptions tsconfig json compilerOptions baseUrl paths src This line allows us to import from folders inside src folder using dummy module src modules dummy module This line allows us to import from the dummy module folder itself using dummy module dummy module src modules dummy module This line allows us to import from folders inside src modules dummy module folder using dummy module We are now able to import using the above aliases In case TypeScript still complains about your imports then create a separate tsconfig paths json file next to tsconfig json inside root directory to extend your base config from tsconfig paths json compilerOptions baseUrl paths src This line allows us to import from folders inside src folder using dummy module src modules dummy module This line allows us to import from the dummy module folder itself using dummy module dummy module src modules dummy module This line allows us to import from folders inside src modules dummy module folder using dummy module and modify tsconfig json like this tsconfig json compilerOptions baseUrl Remove paths option extends tsconfig paths json Add this line Webpack configurationIn a react app you ve most likely used create react app as a scaffold So you need to override its internal webpack configuration in order to let the bundler know how to resolve your aliases during build time To do that without ejecting you can use craco npm i craco cracooryarn add craco cracoNext create a craco config js file at your project s root and paste this code const path require path module exports webpack alias path resolve dirname src dummy module path resolve dirname src modules dummy module Finally replace react scripts with craco inside package json file scripts start craco start build craco build test craco test eject craco eject and restart your app yarn startAnd that s all folks	2022-07-03 13:14:40
Apple	AppleInsider - Frontpage News	AirPods Pro 2 probably won't offer fitness tracking features	https://appleinsider.com/articles/22/07/03/airpods-pro-2-probably-wont-offer-fitness-tracking-features?utm_medium=rss	AirPods Pro probably won x t offer fitness tracking featuresApple s second generation of AirPods Pro won t include any fitness tracking capabilities a report claims with the next version more likely to focus on providing audio than health related features Rumors surrounding the AirPods Pro have occasionally touched upon Apple including some form of fitness tracking functionality in the personal audio devices Depending on the rumor the premium earwear could gain elements to enable body temperature and heart rate monitoring The fitness features may not necessarily arrive in a update it is now thought Read more	2022-07-03 13:46:06
Apple	AppleInsider - Frontpage News	Daily deals July 3: $300 off LG 21:9 curved monitor, $259 Hisense 50-inch 4K smart TV, $100 Amazon Echo Frames, more	https://appleinsider.com/articles/22/07/03/daily-deals-july-3-300-off-lg-219-curved-monitor-259-hisense-50-inch-4k-smart-tv-100-amazon-echo-frames-more?utm_medium=rss	Daily deals July off LG curved monitor Hisense inch K smart TV Amazon Echo Frames moreSunday s best deals include a Meross HomeKit compatible smart plug pack for Lego Star Wars Grogu for and much more Best deals for July 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	2022-07-03 13:05:48
海外TECH	CodeProject Latest Articles	Conditional filtering in SQLAlchemy and Python	https://www.codeproject.com/Articles/5307388/Conditional-filtering-in-SQLAlchemy-and-Python	python	2022-07-03 13:49:00
海外科学	NYT > Science	Miners Discover a Frozen Baby Mammoth in Canada	https://www.nytimes.com/2022/07/02/world/canada/baby-woolly-mammoth-canada.html	Miners Discover a Frozen Baby Mammoth in CanadaExperts believe that the woolly mammoth unearthed in the Klondike gold fields of the Yukon of Canada had been preserved in the frozen ground for more than years	2022-07-03 13:21:38
ニュース	BBC News - Home	Chris Pincher: New claims emerge against former Tory MP	https://www.bbc.co.uk/news/uk-politics-62025612?at_medium=RSS&at_campaign=KARANGA	behaviour	2022-07-03 13:34:28
ニュース	BBC News - Home	Firefighters tackle Bromley tower block fire	https://www.bbc.co.uk/news/uk-england-london-62027621?at_medium=RSS&at_campaign=KARANGA	storey	2022-07-03 13:18:58
ニュース	BBC News - Home	Emotional Sue Barker gets Centre Court ovation	https://www.bbc.co.uk/sport/av/tennis/62029228?at_medium=RSS&at_campaign=KARANGA	barker	2022-07-03 13:41:42
ニュース	BBC News - Home	England v India: Jonny Bairstow makes another brilliant century	https://www.bbc.co.uk/sport/av/cricket/62028296?at_medium=RSS&at_campaign=KARANGA	jadeja	2022-07-03 13:14:18
ニュース	BBC News - Home	What happened when England last hosted the Women's European Championship?	https://www.bbc.co.uk/sport/football/61810075?at_medium=RSS&at_campaign=KARANGA	What happened when England last hosted the Women x s European Championship Seventeen years after England last hosted the Women s European Championship the tournament is back in the country but what was it like in and was it a success	2022-07-03 13:26:38
北海道	北海道新聞	道内８０地点で真夏日　８市町で１８人搬送　今年一番の暑さに	https://www.hokkaido-np.co.jp/article/701335/	高気圧	2022-07-03 22:49:13
北海道	北海道新聞	中国外相がミャンマー初訪問　経済協力強調、和解促す	https://www.hokkaido-np.co.jp/article/701339/	国務委員	2022-07-03 22:48:00
北海道	北海道新聞	ヤ１１―Ｄ４（３日）　小沢がプロ初勝利	https://www.hokkaido-np.co.jp/article/701332/	青木	2022-07-03 22:28:29
北海道	北海道新聞	激戦北海道、２党首激突　岸田首相と立憲・泉代表　物価高対応巡り応酬	https://www.hokkaido-np.co.jp/article/701333/	岸田文雄	2022-07-03 22:37:01
北海道	北海道新聞	豪首相、ウクライナ訪問　キーウ近郊の被害視察	https://www.hokkaido-np.co.jp/article/701337/	首相	2022-07-03 22:36:00
北海道	北海道新聞	青山組が準々決勝進出　ウィンブルドン第７日	https://www.hokkaido-np.co.jp/article/701334/	決勝進出	2022-07-03 22:17:00