投稿時間:2021-06-14 04:26:46 RSSフィード2021-06-14 04:00 分まとめ(34件)

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Program	[全てのタグ]の新着質問一覧｜teratail（テラテイル）	< router-view/>と書くとコンポーネントの内容が重複して表示されてしまう理由	https://teratail.com/questions/343867?rss=all	ltrouterviewgtと書くとコンポーネントの内容が重複して表示されてしまう理由環境vue系で作成しています。	2021-06-14 03:25:07
Program	[全てのタグ]の新着質問一覧｜teratail（テラテイル）	メイン画像の左に設定していないはずの余白がついてしまう	https://teratail.com/questions/343866?rss=all	メイン画像の左に設定していないはずの余白がついてしまうコーディングの練習をしています。	2021-06-14 03:11:18
海外TECH	Ars Technica	Ticket for space flight with Jeff Bezos is auctioned for $28 million	https://arstechnica.com/?p=1772971	gravity	2021-06-13 18:41:53
海外TECH	DEV Community	Django: Stocker et lire des fichiers sur Amazon S3 en 8 étapes	https://dev.to/ericlecodeur/django-stocker-et-lire-des-fichiers-sur-amazon-s3-en-8-etapes-3gnh	Django Stocker et lire des fichiers sur Amazon S en étapesSi vous désirez plus de contenu francophone comme celui ci cliquer Follow ou suivez moi sur Twitter Comment utiliser le service S de Amazon afin de stoker et lire des fichiers et des images Étape Avoir un project Django déjàcréer dans lequel vous aimeriez ajouter la possibilitéd envoyer des fichiers et des images sur Amazon S et de les lires par la suiteÉtape Créer un compte Amazon S et créer un nouveau bucket lors de la création du bucket vous pouvez utiliser les valeurs par défaut sauf pour la sécurités assurer que Block all public access n est PAS coché Attention ne pas mettre de fichiers avec informations sensible dans ce bucket car il est ouvert pour lecture àtous le web Étape Une fois le bucket créé ouvrir le bucket et aller àl onglet Permissions Dans la section Bucket Policy cliquez sur Edit et ajouter ce code et ensuite cliquez sur Save changes Version Id Policy Statement Sid Stmt Effect Allow Principal Action s GetObject Resource arn aws s your bucket name Étape Utiliser le service S àpartir de votre application Django Pour ce faire nous allons installer le package Django Storages et Boto Django Storages permet de se connecter àdifférent système de storage comme Amazon S Dropbox Digital Ocean Google Cloud etc Boto est le SDK Python pour se connecter àAmazon SDans ce tutoriel nous n allons pas utiliser directement Boto C est Django Storages qui s en occupe pour nous pip install django storages pip install botoÉtape Vous devez modifier votre fichier settings py et y inclure les lignes suivantes aws settingsAWS ACCESS KEY ID AWS SECRET ACCESS KEY AWS STORAGE BUCKET NAME AWS QUERYSTRING AUTH FalseAWS S FILE OVERWRITE FalseAWS DEFAULT ACL NoneDEFAULT FILE STORAGE storages backends sboto SBotoStorage Les AWS ACCESS KEY ID et AWS SECRET ACCESS KEY sont disponible dans la console de S en cliquant sur l option My Security Credentials dans le menu portant votre nom d usager Situéen haut àdroite Une fois sur la page de Your Security Credentials click sur Access Keys et créer une nouvelle clé Le ID et le secret vous seront donné Étape Vous pouvez maintenant stocker des fichiers sur Amazon SPour faire le upload d images par exemple vous pouvez créer un model avec un champ ImageFieldfrom django db import modelsclass Product models Model name models CharField max length description models TextField blank True null True image models ImageField Ensuite faire la migration et l exécuter python mange py makemigrations python mange py migrateAjouter ce modèle àl Admin Panel admin pyfrom django contrib import adminfrom models import Productadmin site register Product Si vous n avez pas encore de superuser pour accèder àl Admin Panel vous pouvez en créer unpython manage py createsuperuserÉtape Vous pouvez maintenant aller dans l Admin Panel localhost admin faire votre login cliquez sur Product et ajouter un Product L image que vous aller choisir en cliquant sur Choose File sera automatiquement envoyédans votre bucket sur Amazon S L upload s effectue lors de la creation du Product Étape Vous pouvez maintenant lire les fichiers stockés sur votre Amazon SPar exemple pour afficher une image dans une template Vous pouvez utiliser la propriété url de votre champ image lt img src product image url gt Étape Il est également possible d utiliser Amazon S pour stocker tous vos fichiers static de votre projet Par exemple les fichiers css js et images Pour ce faire vous devez ajouter cette ligne de code àsettings pySTATICFILES STORAGE storages backends sboto SBotoStorage Ce code indique àDjango que vos fichiers static sont maintenant stockésur Amazon S Si vous relancer votre application python manage py runserver vous remarquerez que votre application ne fonctionnera pas comme il faut car vos fichiers statics ne sont pas encore dans votre Amazon S Pour les envoyers vous devez exécuter la commande python manage py collectstaticDjango va donc envoyer tous vos static dans votre bucket SSi vous relancez l application tout devrait être redevenu normal Si vous désirez plus de contenu francophone comme celui ci cliquer Follow ou suivez moi sur Twitter	2021-06-13 18:36:07
海外TECH	DEV Community	Top React Boilerplates for 2021	https://dev.to/comscience/top-react-boilerplates-for-2021-21ce	Top React Boilerplates for React boilerplates for In recent times React js has seen itself rise in popularity and become one of the most loved front end frameworks of all time We will be looking at these boilerplates for React today ️⃣create react app ️⃣create next app ️⃣react vite ️⃣react boilerplate ️⃣react starter kitIf you end up liking this article make sure to follow me on twitter where I regularly share awesome learning resources like this one Kapeel Typescript kokaneka Today s sketchnotes are about ternary operators in javascriptI m creating sketchnotes for javascript concepts from the book You don t know JS YDKJS by getify using excalidraw by vjeux webdev webdevelopment DaysOfCode PM Jul create react appCreate React App CRA is your safest bet when it comes to bootstrapping your react applications as it s the official bootstrapping script recommended by React documentation As per the official documentation site Create React App is a comfortable environment for learning React and is the best way to start building a new single page application in React Getting startedIn order to set up a new app using create react app we run the commandnpx create react app my appThe npx command being used here is different from the npm commands npx stands for Node package execute which gets automatically installed onto the system while installing npm version or higher The specialty of the npx command being that it can execute any package from the npm repository without the need for installing the package beforehand That command creates a new folder called my app in the current directory and sets up a react project inside that folder In order to run a development server and work on the app we use the command npm startAnd when satisfied with the code changes we can use npm run buildWhich generates an optimized build folder that can be deployed wherever we want to host our app Main featuresCreate the app with a template of your choice by appending the create command with the template flagnpx create react app my app template template name Create the app with typescript support by choosing the typescript template npx create react app my app template typescriptSupport for modern JavaScript features like async await rest spread dynamic imports right out of the box which make the developer s life easier Direct support for CSS files and CSS modules and SCSS support with the help of node sass Routing support using react router and code splitting support through dynamic imports Ejecting from create react appWhile the simplicity that create react app brings to the table is much appreciated there are some scenarios wherein we need additional control over our codebase and its features To handle such scenarios create react app provides us with an option to customize the build tool or other configurations by running the script npm run ejectThis is a one way operation that removes the single react scripts dependency that did all the heavy lifting behind the scenes and bring back all the dependencies and transitive dependencies like webpack babel etc back into the package json where the user can have full control over them dependencies before ejecting dependencies testing library jest dom testing library react testing library user event papercss react react dom react scripts web vitals dependencies after ejecting dependencies babel core pmmmwh react refresh webpack plugin svgr webpack testing library jest dom testing library react testing library user event typescript eslint eslint plugin typescript eslint parser babel eslint babel jest babel loader babel plugin named asset import babel preset react app bfj camelcase case sensitive paths webpack plugin css loader dotenv dotenv expand eslint eslint config react app eslint plugin flowtype eslint plugin import eslint plugin jest eslint plugin jsx ay eslint plugin react eslint plugin react hooks eslint plugin testing library eslint webpack plugin file loader fs extra html webpack plugin identity obj proxy jest jest circus jest resolve jest watch typeahead mini css extract plugin optimize css assets webpack plugin pnp webpack plugin postcss flexbugs fixes postcss loader postcss normalize postcss preset env postcss safe parser prompts react react app polyfill react dev utils react dom react refresh resolve resolve url loader sass loader semver style loader terser webpack plugin ts pnp url loader web vitals webpack webpack dev server webpack manifest plugin workbox webpack plugin It is usually not that common to eject from create react app but it is good to have that option if you know what you are doing Strong pointscreate react app is the official recommendation for bootstrapping react apps by the React team Covers all basic features without extra dependencies Comprehensive documentation site Takes away the hassle of configuration away from the developerSo in case you are looking for a tried and tested way to get started with react development without the hassle of doing things yourself then create react app is the tool to use weak pointsNot much control over the finer aspects of the repository if not ejected create next appCreate react app is a decent way to bootstrap a generic SPA with client side rendering but if the requirement is a little fancier like server side rendering or static site generation then the best way to get started is using create next app It is a simple CLI tool to get started with Next js projects Getting StartedIn order to get generate the boilerplate we just need to run the command npx create next appThereafter we answer the questionnaire and at the end of it a Next js code repo is set up for us There is also a provision to bootstrap an app based on any example from the official documentation page by using the e or the example flag In order to start a dev server we run npm run devThis brings up the home page of the dev server In the code repo create next app creates a folder structure that looks something like this Any JavaScript files that are created in the pages directory create routes in the Next js app with the same name as that of the file Any assets like images required are to be placed inside of the public folder CSS and LESS are supported by default Main featuresIf your requirement is that of a rather static site and you are looking for a solid react framework that is way ahead of others in terms of Server side rendering and Static site generation definitely go ahead with Next js and you will not be disappointed Strong pointsAutomatic Dynamic routing through file naming convention and getStaticPaths method Static site generation is supported through the the getStaticProps method Server side rendering through the getServerSideProps method Fast refresh and fetch support out of the box Weak pointsIs not optimized in case of applications that need constant data fetching and refreshing There is a learning curve associated with getting to learn the aspects of SSR which are unique to Next js react viteVite is a relatively new candidate in the frontend framework tooling space that is created maintained by Evan You of Vue JS fame Vite is a universal solution that can be used to bootstrap projects from several tech stacks using templates which at the present support Vue React Preact etc Getting startedFor the scope of this article we will explore the creation of React projects In order to initiate the repo creation we runnpm init vitejs app react vitewhich brings up this selection menu Selecting the react option creates a react project in the directory What is interesting to note is that it takes roughly a second to set up the repo as opposed to other tools which take a few seconds for the entire process After the repo is setup we need to move into that directory and install the vite package as a dev dependency cd react vitenpm i save dev viteThen we can run the dev script as npm run devWhich brings up the default UI at localhost Do note that in order for the dev script to run properly we need to be on the latest build version of Node that supports worker threads else we get this error while trying to run the dev script Cannot find module worker threads The latest version of npm can be installed and the several versions installed on your system can be managed by using nvm Main featuresVite is different from the other boilerplate tools in this list as it was built from the ground up keeping the Developer Experience DX in mind Quoting from Vite s official documentation page Vite the French word for fast pronounced vit is a new breed of frontend build tool that significantly improves the frontend development experience Even though vite supports an exhaustive set of feature list the main problem that Vite set out to solve was the issue that most bundling tools think webpack parcel face at scale Whenever the code base grows to a decent size the bundler takes up several minutes to spin up a local instance of a dev server Also with respect to updating code and getting a live preview even with the optimizations like Hot module replacement HMR in place it still takes several seconds for a code change to reflect onto the UI in case a critical file is modified Vite solves these problems by Not bundling the code at all but capitalizing on the availability of native ES module support on most modern browsers Classifying the entire code base into library code and source code and by pre building the library code using esbuildBy performing HMR over native ES modules which considerably reduces the HMR boundary to be invalidated and improves performance While the development server does not bundle code the production scripts still build a bundle using Rollup which is highly optimized Strong points Main focus on the developer experience DX Typescript support out of the boxActive development and maintenance by Evan You and the teamCSS import support with CSS modules as well as preprocessor support wasm and web worker supportHence if you are looking for something that is on the bleeding edge as far as developer experience future proofing amp performance enhancements are concerned react vite is your tool Weak pointsUpcoming technology woking on the bleeding edge of build process and hence there might not be many developers in the industry who truly understand it in order to tweak the process if necessaryNot as popular and old as compared to something like webpack which means there might be comparitively less documentation and support available online react boilerplateAnother tool worth adding to the list when it comes to setting up a react project is react boilerplate On its landing page react boilerplate provides this description Quick setup for new performance oriented offline first React js applications Getting startedWhile the basic premise based on which the library is built is the same as that of others the steps to set up a new code repository are slightly different Firstly we need to clone the setup repo git clone my react boilerplateNext we need to move into the cloned repository and run the setup script cd my react boilerplatenpm run setupAnd then the start script to kick off the dev server npm startThis brings up this home page Main featuresThe main difference between other tools on this list and react boilerplate is that post setup we get a highly opinionated yet highly feature rich development setup with feature support for react router for routing redux for state management redux saga for enhancing redux reselect for optimization immer for immutability and styled components for fast tracking development Even the project structure is highly opinionated with separation between containers connected to redux store and components that are pure components Strong points Full fledged repo setup with routing state management and other optimizations etc Maintained by Max Stoiber another big name in the react ecosystem Styled components support out of the box Weak points Not catching up with the latest trends in development the last commit on the repository was in March Highly opinionatedWith that in mind if you need to get started with react development needing all the bells and whistles associated with a react project right from the beginning and don t mind being tied up with an x technology to achieve y outcome approach that is pre decided by the library creators then react boilerplate is a strong candidate react starter kitLastly let s take a look at react starter kit which describes itself as an isomorphic web app boilerplate The home page also mentions that react starter kit is highly opinionated which means that it has already selected the tech stack for us which comprises of Node js Express GraphQL etc In a way it takes the load away from the users of the boilerplate by making the decision for us while also making sure that we follow the current best practices in the industry Getting startedIn order to get started with the boilerplate we need to clone the latest repository and use that as the starting point git clone o react starter kit b master single branch MyAppThen move into the created folder and install the dependencies cd MyAppyarn installAnd start the dev server as follows yarn startThat brings up the boilerplate home page Main featuresThe main feature of this boilerplate is that it is highly feature packed yet highly customizable In addition to the exhaustive file structure that we get at repo setup ├ー build The folder for compiled output├ー docs Documentation files for the project├ー node modules rd party libraries and utilities├ー public Static files which are copied into the build public folder├ー src The source code of the application│├ー components React components│├ー data GraphQL server schema and data models│├ー routes Page screen components along with the routing information│├ー client js Client side startup script│├ー config js Global application settings│├ー server js Server side startup script│└ー Other core framework modules├ー test Unit and end to end tests├ー tools Build automation scripts and utilities│├ー lib Library for utility snippets│├ー build js Builds the project from source to output build folder│├ー bundle js Bundles the web resources into package s through Webpack│├ー clean js Cleans up the output build folder│├ー copy js Copies static files to output build folder│├ー deploy js Deploys your web application│├ー postcss config js Configuration for transforming styles with PostCSS plugins│├ー run js Helper function for running build automation tasks│├ー runServer js Launches or restarts Node js server│├ー start js Launches the development web server with live reload │└ー webpack config js Configurations for client side and server side bundles├ーDockerfile Commands for building a Docker image for production├ーpackage json The list of rd party libraries and utilities└ーyarn lock Fixed versions of all the dependenciesAnd the number of scripts that we get out of the box scripts precommit lint staged lint js eslint ignore path gitignore ignore pattern lint css stylelint src css less styl scss sass sss lint yarn run lint js amp amp yarn run lint css fix js yarn run lint js fix fix css yarn run lint css fix fix yarn run fix js amp amp yarn run fix css flow flow flow check flow check test jest test watch yarn run test watch notify test cover yarn run test coverage coverage yarn run test cover amp amp opn coverage lcov report index html clean babel node tools run clean copy babel node tools run copy bundle babel node tools run bundle build babel node tools run build build stats yarn run build release analyse deploy babel node tools run deploy render babel node tools run render serve babel node tools run runServer start babel node tools run start The library also makes sure that it provides several recipes which are like official guides that explain how to accomplish X while working with react bootstrap which makes it super handy Strong points Isomorphic boilerplate which takes into consideration the operations to be performed on server land Node js like SSR Support for GraphQL through ApolloRecipes for implementing common use cases React testing via Enzyme and static type checking via Flow Weak points Large number of dependencies which might bloat up the bundle size even if not usedHighly opinionatedWith those features that react boilerplate is willing to offer and the customizations that it provides it is worth giving a shot if we are looking for an Isomorphic boilerplate that is different from create next app ConclusionWith that we wrap up the roundup for Top React boilerplates in As we can see each one of them comes with its own set of Things it does best and Things it is not so good at This means it all comes down to the use case at hand It also means the choice that we make will vary greatly based on the nature of the end result we are aiming at but at least the good thing is that we are not short of choices	2021-06-13 18:32:48
海外TECH	DEV Community	Learn any programing language, framework or library fast and efficiently	https://dev.to/abodmicheal/learn-any-programing-language-framework-or-library-fast-and-efficiently-251p	Learn any programing language framework or library fast and efficientlyI m Abod and I work as a front end developer In this lesson I ll show you how to learn a new programming language library or framework in the quickest possible method This strategy has helped me learn a new language quickly despite the fact that it can be stressful and challenging at times This is what I used for Laravel I was hired as a freelance web developer to work on a finance online app Note I had never used laravel before and had never done a FullStack job before but I used it and completed the lengthy and complex job in a month without receiving a single complaint from the client Without realizing it I learned a lot and was able to solve problems in laravel as well as answer most interview questions about this framework I chose to publish it because I tried it on other frameworks as well Get a short project based lesson on the language or library you want to learn at least a hr min video and up to hours which you could break into two days hr mins one day and hr mins the next but if you can finish the lesson base project in a day that s fantastic Simply get the video and follow along with the instructor You might also include a small function that isn t included in this video like an extra button What is the purpose of this This technique gives us insights into how things are done in the language introduces you to a few concepts such as declaring a variable how we use statements in that language and so on it essentially exposes you to how that language is used on a real project which helps you pick up a few things in that language When you re following the teacher you ll very certainly notice an error that isn t in the video and that you ll have to solve on your own or with the help of Google You might also jot down a few concepts in the language that you don t grasp completely Let s move on to the next step now that you ve gained a better understanding of this language If you know a programming language find out how this one differs from the one you know if you don t that s fine we ll just go through the documentation and look at the table of contents then identify something you don t know or a concept you haven t seen or worked with in the first step and write it down alongside what you wrote in the first step This is the list of items we wish to concentrate on We don t know or haven t worked with them because they re unfamiliar to us We re looking for a course that will offer us a general overview of the language such as an hour long film that will offer us a general introduction and principles of the language NOTE We are not using a project based instruction in this section This section will assist us in gaining general knowledge of the language that we do not currently possess We go to a website like algoexpert and practice and solve problems in this language just simple problems if there are questions you can t answer google at least to questions and write down a few difficult concepts spend time on this and google all of the written concepts from step to get to know how it works and solve questions on algoexpert while you google Most of the time we only study a handful of the concepts in step which enhances our capabilities and helps us grasp how to apply the concepts in this language better In my instance I was learning the Laravel framework therefore I searched for Laravel interview questions and Laravel live coding quiz on Google which lead me to and When you are comfortable jump on a project without a tutorial any easy project do it on your own and make sure it is something you can put in your portfolio when you are done you could try an advanced tutorial when you run into a problem google or check a video on how to solve that specific problem and move on to the next Steps one through four can be completed in a day or two if you devote a significant amount of time to them such as hours or more a day Step five can be completed at your leisure Keep in mind that you must complete each job Please leave a comment if this works for you After that begin establishing a large number of projects or begin working on the project for which you learned this new language or framework some useful resources	2021-06-13 18:26:19
海外TECH	DEV Community	How to Center Align Items in CSS with 4 Solid Methods.	https://dev.to/elijahtrillionz/how-to-center-align-items-in-css-with-4-solid-methods-31c3	How to Center Align Items in CSS with Solid Methods Center aligning items has being a much discussed topic in CSS Beginners and sometimes professionals often find themselves googling this topic when they get stuck while trying to center align texts or elements in CSS From my experience center aligning has never been a problem to me since I saw a cheat in a YouTube video Now don t be quick to go to YouTube to search cheat in aligning items to the center You are not going to find what I found that way I found these cheat between the lines of this video The YouTuber may probably not recall they mentioned something like that From this video I discovered that center aligning items in CSS depends plainly on theHTML element to be centered Parent element of the element to be centered What type of element are you center aligning Is it block or inline Which element is to be styled when center aligning a child element the parent element or the child element itself What are the already declared styles of these elements parent and child That is if there are any There are different ways to center align texts and elements in CSS but not all of it will work for all elements for exampleOne of the common ways to align items to the center is text align center Now try this CSS declaration on a div element and then a span element You would notice the span element doesn t move to the center this is because of the type of element Now try adding display block text align center on that span element What you would notice is that it successfully moved to the center Am sure you are now curious to know why but before then I believe you might be interested in Places to Learn Coding for Free Ways to Center Align items in CSS Before I list them there is an uncommon way maybe common that developers use to center align items I e with padding I don t do that and am not going to state it here because you wouldn t need it text align Center Align TextsThe text align center is a very common way to center align texts horizontally In this case we align a text to the center of a parent element So it basically doesn t matter the width of that element the parent element now the text inside will move absolutely to the center of that element Here is something about text align it aligns every text in that element Doesn t matter if the text is inside another element For example HTML lt div class parent gt Hello World lt div gt CSS parent text align center If the text in the div is inside another block element e g a element It will still center align the textHTML lt div class parent gt lt p class child gt Hello World lt p gt lt div gt CSS parent text align center child border px solid green ResultThe above is center aligning a text with the text align property we can also center align an element But this element must be an inline element HTML lt div class parent gt lt span class child gt Hello World lt span gt lt div gt CSS parent text align center border px solid red child border px solid green ResultNote We can t center align texts in an inline element This property can only be used on a block element It can t work on an inline element because the text in an inline element is already taking up the full width and height of the element So where will we be centering it to HTML lt span class parent gt Hello World lt span gt CSS parent text align center border px solid red ResultIf the text above is wrapped in a block element it will align to the center but it will have a negative impact on the parent element So don t do it Nonetheless we can still center align inline elements to the center of a parent element which has to be a block element as shown above In a nutshell a block element can use the text align property to horizontally center align any text or inline elements inside of it to its center You may say what if I want to vertically align the text to the center Then I d say use the next tip Hey since you are reading this I figured you might be interested in knowing the requirements to get you a cheap laptop for coding Margin center align elements The margin auto or margin auto declaration will horizontally align an element to the center of a parent element This property is used on the child element Recall that the child element is what we intend to align to the center of a parent element HTML lt div class parent gt lt p class child gt Hello World lt p gt lt div gt CSS parent border px solid red child width px margin auto or margin auto border px solid green ResultWe reduced the width of the child element to px to see the effect of the margin auto effect Furthermore the element to be aligned to the center depends on the parent element And for this to work it also depends on the type of element the parent and child element is The child element must be a block element And the parent element must be a block element for the child to align to its center If the parent element is not a block element the child element will align to the center of the next parent element that is a block element HTML lt body gt lt span class parent gt lt p class child gt Hello World lt p gt lt span gt lt body gt CSS parent border px solid red child width px margin auto or margin auto border px solid green ResultIn the code above the next parent element is the body element which is a block element What we have been doing is horizontally aligning items to the center with the margin property we can also align vertically HTML lt body gt lt span class parent gt lt p class child gt Hello World lt p gt lt span gt lt body gt CSS parent border px solid red child width px margin px auto moves px from the top and bottom of the parent element border px solid green ResultNote The above example will no longer work as expected if a height is set for the parent element Setting a height for the child only will still perfectly center align the element horizontally and vertically In a nutshell a child element which is a block element can use the margin property to vertically and mostly horizontally center align elements to the center of a parent element that should be a block element Again you may say what if I want to set a height for the parent element and at the same time center align the child element to its center I d say use the next tip Quick Tip on Centering Inline Elements Just in case you are wondering how you would center align inline elements with the text align property and the margin property it is as simple as setting it to a block element with the display property i e some inline element display block Flexbox Center aligns elements and texts Flexbox is one of the solid ways to center align an element or a text but if your HTML elements are not well positioned you may end up being discouraged The display flex declaration works on both a default block and inline element as it changes that element to a flexbox If you are not familiar with Flexbox I recommend you go through a tutorial it s a bit wide so we won t be explaining every aspect of it in this article Center Align texts with Flexbox A flexbox element can horizontally align a text in it to its center But you should note that the width of this element the flexbox element that contains the text is absolute to the width of the nearest parent element that is a block element HTML lt body gt lt div class parent gt Hello World lt div gt lt body gt CSSbody width will take up of device s screen border px solid red parent display flex justify content center used to center align horizontally ResultTo make it clear when display flex is used on any type of element First it converts that element to a flexbox element The text inside that flexbox element is aligned to the center of the flex element with the justify content center property and valueFinally the width of the flexbox element is dependent on the width of its nearest parent element that is a block element So if the width of its parent element is of the device s width the flexbox element is going to be of the parent s width This happens by default Hey there how would you like to see me make a NoSQL Database clone with JavaScript Classes Vertically align texts to the center using flexbox To align vertically you can simply specify the height of the flex element and then use the align items property to align the text vertically to the center HTML lt body gt lt div class parent gt Hello World lt div gt lt body gt CSSbody width will take up of device s screen border px solid red parent height px display flex justify content center used to center align horizontally align items center used to center align vertically ResultBy default the height of a flexbox element is not dependent inherited on from the parent element You can make it inherit by using height inherit on the flexbox element Center Align Elements with FlexboxWhen display flex is used on an element every child element will be converted to an inline block element HTML lt body gt lt div class parent gt lt span class child gt Hey World lt span gt lt div class child gt Hey World lt div gt lt span class child gt Hey World lt span gt lt div gt lt body gt CSS parent display flex justify content center border px solid red child padding px px margin px border px solid green ResultWhen center aligning multiple elements to the center of a flex element wrap these multiple elements with any element block or inline HTML lt body gt lt div class parent gt lt div class child wrapper gt lt span class child gt Hey World lt span gt lt div class child gt Hey World lt div gt lt span class child gt Hey World lt span gt lt div gt lt div gt lt body gt CSS parent display flex justify content center border px solid red child margin px border px solid green ResultWithout wrapping you would have the elements horizontally stacked together and still aligned to the center i eHTML lt body gt lt div class parent gt lt span class child gt Hey World lt span gt lt div class child gt Hey World lt div gt lt span class child gt Hey World lt span gt lt div gt lt body gt CSS parent display flex justify content center border px solid red child margin px border px solid green ResultAgain by default the width of the flexbox element is dependent on its parent element that is a block element While the height isn t To vertically center align the elements in the flexbox element we will specify a height for the flexbox element along with the align items propertyHTML lt body gt lt div class parent gt lt span class child gt Hey World lt span gt lt div class child gt Hey World lt div gt lt span class child gt Hey World lt span gt lt div gt lt body gt CSS parent height px display flex justify content center border px solid red child margin px border px solid green ResultYou can also inherit the height of the parent element of the flexbox element with height inherit declared for the flexbox element In a nutshell an inline or block element as the parent element can use the display property to align a text or element vertically and horizontally to its center Position and Transform Center Align Elements and Texts The position property is also a great way to center align elements I mostly use it when am making a fixed element or a dropdown In this format you would need to practically style the parent element and the child element will be placed in the middle of the parent element The parent element will need to show in your CSS that it is the element you want the child element to be in the middle of and you show this by setting the position property of the parent element to fixed or relative HTML lt body gt lt div class parent gt lt some element gt Some text lt some element gt lt div gt lt body gt CSS parent position relative The child element will need to be set absolute to the position of the parent element What this means is that the width height position of the child element is now dependent on the parent element HTML lt body gt lt div class parent gt lt p class child gt Hello World lt p gt lt div gt lt body gt CSS parent position relative child position absolute Now let s try to center align it We use the position property as well as the transform property on the child element to do this HTML lt body gt lt div class parent gt lt p class child gt Hello World lt p gt lt div gt lt body gt CSS parent position relative height px border px solid red child position absolute left adjusts the element from the left transform translateX horizontally re adjusts the element to the center ResultIf you re familiar with the translate value you would know that the first parameter positions element horizontally and the other vertically HTML lt body gt lt div class parent gt lt p class child gt Hello World lt p gt lt div gt lt body gt CSS parent position relative height px border px solid red child position absolute left adjusts the element from the left top adjusts the element from the top transform translate horizontally amp vertically re adjusts the element to the center ResultAnd that s all the four indomitable ways to center align elements or texts vertically or horizontally in CSS Use CaseLet s practically use this on a webpage In this section we will try each case listed above to try and center align an element which will contain a text NOTE Have in mind that wherever I specify or may have specified elements in this article it actually includes all elements like images input You should also have in mind that the examples where we stated why some elements would not center align because it is an inline element And I have said the solution is to not make it inline Let s make something Say we have a header that we want to be fixed on the top of our webpage and in this header there is going to be an h element that will contain the name of our webpage lt header gt lt h gt Dashboard lt h gt lt header gt Now what we want to do is center align the h element How would you do this First let s make the header fixed and add a border header position fixed border px solid orange Now let s center align the text because the parent element is fixed I usually would just make the h absolute and then center align it with the transform property But for the sake of this tutorial let s try all of the listed tips Try using the center align property on the parent element the header element I would try this because the parent element is a block element and the child element is a block element that contains a text we want to center align What do you think Is it gonna work Of course it would If you try it now it will work but won t reflect This is because by default when we specify an element to be of position fixed the element s width is reduced to the width of the text in it header position fixed border px solid orange text align center ResultWhat we have to do now is give it a full widthheader position fixed right left border px solid orange text align center ResultNow it works as expected You might be interested in How to Become a Web Developer in Try using the margin property on the h element I would try this because it meets the condition of the margin property and that is for the parent element to be block and the child element to be a block element header position fixed right left border px solid orange h margin auto Though our webpage satisfies the condition it still doesn t work and that is probably because of the position property Try using flexbox on the parent element the header element header position fixed right left border px solid orange display flex justify content center ResultThis would work fine as expected Try using the position and transform properties on the h element header position fixed right left border px solid orange height px h position absolute left transform translateX ResultIt works fine because the parent element already shows it is the parent element and so the child element just needs to be moved to the center of its father or mother This is a very basic webpage complex pages or sections may not always end like this having three cases work perfectly But no matter the case try to always think like this does it satisfy the text align condition if it doesn t move to the next Like that So instead of trying it first to see if it would center align you can simply use your cerebrum to tell if it s going to work ConclusionWith this article center aligning elements or texts in CSS can and should never be a problem for you What I d recommend you do now is practice you can practice not just from scratch but from problems Go to GitHub projects where frameworks were used to center align use these principles on it Alright leave a comment for me if you want to correct me tell me something If you enjoyed this article please share with as many CSS folks as you can I believe they will learn one or two things from here Also if you wanna support my blogging journey you want me to keep posting you can support me by becoming a patron or you can buy me a coffee Thank you and have a great time styling	2021-06-13 18:12:50
海外TECH	DEV Community	JavaScript Array methods	https://dev.to/shreyazz/javascript-array-methods-3bb0	JavaScript Array methodsWe have a lot of array methods in JavaScript but in this blog you are gonna see only the most useful methods and after reading this I am pretty sure that you are going to master these methods and use them to optimize your codeBefore getting started I am going to use arrow function and in case you don t know arrow functions don t worry I have used normal functions ES syntax also So Let s get started This blog includes →For EachFilterMapSortReduce For Each →This is a simple for loop Now let s try this same thing using for Each loop For each helps you to reduce the lines of code and makes the code much more readable You can also give index in for each loop The first parameter is the variable in which all the values are stored one by one and the second parameter is the index of the current iteration Filter →As the name suggests filter is a method which helps us to filter some values according to a given condition The filter method creates a new array with the values which is falling under the given condition from the existing array Map → map method creates a new array and performs a particular function for each element in the array This does not change the original array as it creates a new array Sort →As the name suggests sort method helps us to sort the array according to our condition If the condition is true then we return or else we return to get a better idea about it we can use an example If we want to sort the companies according to their start years sort also makes a new array and the original array is un touched Here in this function we have parameters a and b which will be assigned to values from the array and then they will be compared and then filled in the new array Reduce → reduce method reduces the whole array to a single value reduce method executes a given function for each value in the array from left to right starting from index to array s length for example we have to find the sum of all the ages so without for loop we can do this using reduce function We have to give to set the initial value from which the values will start although it is optional so you may skip it BONUS indexOf →This is a bonus array method for y all This method checks if the entered value is in the array or not If the searched value is found it will return the position index else it will return Note idexOf is cases sensitive Next Blog s topic gt Features introduced in ES Do visit the community made by me and my friend sumeet for more amazing and informative stuff and if you wanna recommend something or give feedback feel free to comment CodeBox s handles	2021-06-13 18:00:43
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