投稿時間:2023-08-25 00:19:09 RSSフィード2023-08-25 00:00 分まとめ(27件)

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IT	ITmedia 総合記事一覧	[ITmedia Mobile] Galaxyの体験エリア、下北沢に期間限定オープン　若い世代に折りたたみスマホなどを宣伝	https://www.itmedia.co.jp/mobile/articles/2308/24/news190.html	ITmediaMobileGalaxyの体験エリア、下北沢に期間限定オープン若い世代に折りたたみスマホなどを宣伝サムスン電子ジャパンは月日、Galaxyブランドの製品を体験できるエリア「Jointheflipsideシモキタ」をオープンした。	2023-08-24 23:47:00
IT	ITmedia 総合記事一覧	[ITmedia Mobile] Galaxyスマホを即日修理　「Galaxy リペアコーナー」がドコモショップ池袋や三宮などにオープン	https://www.itmedia.co.jp/mobile/articles/2308/24/news189.html	ITmediaMobileGalaxyスマホを即日修理「Galaxyリペアコーナー」がドコモショップ池袋や三宮などにオープンサムスン電子ジャパンは月日、対象のGalaxyスマートフォンをデータ初期化せずに即日修理が可能な「Galaxyリペアコーナー」を、「ドコモショップ船橋店」、「ドコモショップ三宮さんプラザ店」、「ドコモショップ池袋サンシャイン通り店」にてオープンする。	2023-08-24 23:10:00
js	JavaScriptタグが付けられた新着投稿 - Qiita	DigitalOcean　FunctionのAPIでJSON形式でレスポンスさせる方法	https://qiita.com/noshiro3/items/692de9b15b02b7c4b820	bodyabcreturnresponse	2023-08-24 23:34:47
js	JavaScriptタグが付けられた新着投稿 - Qiita	鉄道の運行情報表示板に憧れて、駅間ラインデータを作成した話	https://qiita.com/mg_kudo/items/1d673a9f8d7de5ad0812	運行情報	2023-08-24 23:12:55
Ruby	Rubyタグが付けられた新着投稿 - Qiita	スコープ名にモデル名を用いたモデル設計とStyle/ClassAndModuleChildren (ネスト記法) のオートコレクションについて	https://qiita.com/yudukikun5120/items/a626562e5771cdadcd98	classandmodulechildren	2023-08-24 23:39:49
AWS	AWSタグが付けられた新着投稿 - Qiita	【イベントレポート】Amazon QuickSight Roadshow!に行きました	https://qiita.com/momokomddn/items/84644447b928e29c6708	amazo	2023-08-24 23:16:23
Ruby	Railsタグが付けられた新着投稿 - Qiita	スコープ名にモデル名を用いたモデル設計とStyle/ClassAndModuleChildren (ネスト記法) のオートコレクションについて	https://qiita.com/yudukikun5120/items/a626562e5771cdadcd98	classandmodulechildren	2023-08-24 23:39:49
海外TECH	DEV Community	.NET Best Practices	https://dev.to/yogini16/net-best-practices-nh3	NET Best Practices Mastering NET Best Practices A Guide to Efficient DevelopmentBeing a developer and write a code is not sometimes enough we really need to get better and follow best practicesIn the fast paced world of software development adhering to best practices is crucial to ensure the maintainability scalability and performance of your applications Microsoft s NET framework offers a versatile and powerful ecosystem for building a wide range of applications from web services to desktop software In this article we ll delve into some of the best practices for NET development accompanied by practical examples Consistent Code FormattingMaintaining a consistent code style across your projects is essential for readability and collaboration Leveraging tools like ReSharper or built in IDE features can help ensure a uniform code format Inconsistent Formattingpublic void InconsistentMethod string variableName example Console WriteLine variableName Consistent Formattingpublic void ConsistentMethod string variableName example Console WriteLine variableName Effective Error HandlingRobust error handling enhances the stability of your applications Implement try catch blocks to gracefully handle exceptions and provide meaningful error messages Example try Code that might throw an exception catch SpecificException ex Log Error An error occurred ex Message Take appropriate action catch Exception ex Log Error An unexpected error occurred ex Message Handle or log the generic exception finally Cleanup code if needed Optimize Memory UsageProper memory management prevents memory leaks and excessive memory consumption Utilize the IDisposable pattern to ensure resources are properly released Example public void ProcessData using var resource new SomeResource Use the resource resource Dispose is automatically called here Asynchronous ProgrammingIncorporate asynchronous programming to improve the responsiveness of your applications especially in scenarios involving I O bound operations Example public async Task lt string gt FetchDataAsync HttpClient client new HttpClient string data await client GetStringAsync return data Dependency InjectionUtilize dependency injection to enhance the testability maintainability and flexibility of your code It promotes loose coupling and modular design Example public class OrderService IOrderService private readonly IOrderRepository repository public OrderService IOrderRepository repository repository repository public Order GetOrderById int orderId return repository GetOrder orderId Caching for PerformanceImplement caching mechanisms like MemoryCache or distributed caching to reduce the load on your application and enhance response times Example public IActionResult GetCachedData var cachedData cache Get dataKey as string if cachedData null Fetch data from the source cache Set dataKey fetchedData TimeSpan FromMinutes return Ok cachedData Security ConsiderationsEnsure that your applications are secure by following authentication authorization and input validation best practices Example Authorize Roles Admin public IActionResult AdminDashboard Only authorized users with the Admin role can access this action return View Unit TestingImplement unit tests to verify the correctness of your code and catch regressions early in the development process Example TestClass public class MathUtilityTests TestMethod public void Add ShouldReturnCorrectSum var result MathUtility Add Assert AreEqual result ConclusionMastering NET best practices is crucial for delivering high quality software that s easy to maintain and scales effectively By following consistent code formatting effective error handling memory optimization and other practices mentioned in this article you ll be well on your way to building robust and efficient NET applications Remember these practices are not set in stone and can evolve with the technology so stay curious and always be open to refining your skills Happy coding	2023-08-24 14:27:30
海外TECH	DEV Community	Mastering React's useRef Hook: A Deep Dive	https://dev.to/samanabbasi/mastering-reacts-useref-hook-a-deep-dive-1548	Mastering React x s useRef Hook A Deep DiveReact s useRef hook is a powerful and versatile tool that allows you to interact with the DOM manage state and optimize performance without causing unnecessary re renders In this comprehensive guide we ll take a deep dive into how useRef works under the hood why it doesn t trigger re renders and how you can harness its full potential Introduction to useRefReact s functional components have revolutionized the way we build user interfaces With the introduction of hooks managing state and side effects has become more straightforward Among these hooks useRef stands out for its unique capabilities What is useRef useRef is a hook in React that allows you to create a mutable reference to a DOM element or any other value that persists across renders While it s often used to access and manipulate DOM elements directly it s also a handy tool for storing values that should not trigger re renders when they change Why is it useful Here are some common scenarios where useRef shines Accessing and Manipulating DOM Elements With useRef you can easily access DOM elements and interact with them directly This is useful for tasks like focusing an input field scrolling to a specific element or animating elements Storing Mutable Values Without Re renders Unlike state variables changes to a useRef object s current property do not trigger re renders This makes it an excellent choice for storing values that don t impact your component s UI Optimizing Performance useRef is a valuable tool for optimizing performance You can use it to memoize expensive calculations ensuring they are only recomputed when necessary Now let s delve into the inner workings of useRef and understand why it doesn t cause re renders Understanding Closures in JavaScriptTo grasp why useRef doesn t trigger re renders it s essential to understand closures in JavaScript The Fundamentals of ClosuresA closure is a fundamental concept in JavaScript where a function remembers its lexical scope even when it s executed outside that scope Closures enable functions to access variables from their containing function even after the containing function has finished executing Consider this simple example function outer const outerVar I am from outer function function inner console log outerVar Accessing outerVar from the closure return inner const innerFunction outer innerFunction Outputs I am from outer functionIn this example inner has access to the outerVar variable thanks to closures This property of closures is crucial in understanding how useRef retains values across renders How Closures Relate to useRefReact s useRef leverages closures to maintain the reference to its current property across renders This means that even when a component re renders the useRef object remains the same and changes to its current property don t trigger re renders In other words useRef creates a closure that captures its current property ensuring it persists between renders This is why modifying useRef s current property does not cause your component to re render useRef Implementation in Plain JavaScriptNow that we understand closures let s look at a simplified representation of how useRef might be implemented in vanilla JavaScript function useRef initialValue const refObject current initialValue return refObject In this simple implementation We define a function useRef that takes an initialValue as an argument Inside the function we create an object called refObject with a current property which is initialized to the initialValue Finally we return the refObject which can be used to access and update the current property This is a basic representation of how useRef could be implemented in plain JavaScript However in React useRef is more powerful and versatile because it s integrated with React s rendering and lifecycle system Immutability and React RenderingReact s rendering mechanism relies on immutability When React detects changes in the state or props of a component it re renders that component However the useRef object s current property can be updated without causing React to re render Let s explore why this happens import React useRef from react function MyComponent const myRef useRef null const handleButtonClick gt Modifying the current property doesn t trigger a re render myRef current textContent Button Clicked return lt div gt lt button onClick handleButtonClick gt Click Me lt button gt lt p ref myRef gt Initial Text lt p gt lt div gt In this example when the button is clicked we modify the textContent of the myRef current element This change doesn t cause the component to re render because the myRef object itself remains the same This behavior aligns with React s philosophy of immutability React identifies changes by comparing new and previous values Since the myRef object s identity i e the reference itself doesn t change when we update its current property React does not consider it a state or prop change that would trigger a re render Identity and Reconciliation in ReactTo further understand why useRef doesn t trigger re renders it s essential to explore React s process of identity and reconciliation Explaining React s Process of ReconciliationReact s core algorithm called reconciliation is responsible for determining when and how to update the DOM to match the new virtual DOM vDOM representation Virtual DOM React maintains a virtual representation of the actual DOM known as the virtual DOM vDOM When a component s state or props change React generates a new vDOM tree Reconciliation React compares the new vDOM tree with the previous one to determine the differences or diffs between them This process is called reconciliation Minimizing Updates React s goal is to minimize the number of updates to the actual DOM It identifies which parts of the vDOM have changed and calculates the most efficient way to update the DOM to reflect those changes Component Identity To determine whether a component should be updated React checks if its identity has changed Identity here means the reference to the component or element which is determined by variables or functions used in the component tree Why useRef Objects Retain Their IdentityThe critical point to note is that useRef objects including their current property retain their identity across renders When a component re renders React ensures that the useRef object remains the same as it was in the previous render In the example above when the button is clicked and the textContent of myRef current is modified the myRef object itself remains unchanged React recognizes that the identity of the myRef object hasn t changed and therefore does not trigger a re render This behavior aligns with React s goal of minimizing updates to the actual DOM by identifying components that have truly changed Consistency Across RendersReact goes to great lengths to ensure that the useRef object s current property remains consistent across renders Let s explore some examples to illustrate this consistency Example Storing a DOM Element Referenceimport React useRef useEffect from react function MyComponent const myRef useRef null useEffect gt Access the DOM element using myRef current myRef current focus return lt input ref myRef gt In this example myRef is a useRef object that persists across renders It s used to create a reference to the lt input gt element and you can access the DOM element using myRef current The useEffect hook is used to focus on the input element when the component mounts The key takeaway here is that the myRef object retains its identity across renders ensuring that myRef current consistently refers to the same DOM element Example Memoizing a Valueimport React useRef useState from react function MyComponent const count setCount useState const doubledCountRef useRef null if doubledCountRef current doubledCountRef current count return lt div gt lt p gt Count count lt p gt lt p gt Doubled Count Memoized doubledCountRef current lt p gt lt button onClick gt setCount count gt Increment lt button gt lt div gt In this example we use useRef to memoize the doubled value of count The doubledCountRef object persists across renders and we calculate and memoize the doubled count value only if it hasn t been memoized before Again the doubledCountRef object s identity remains consistent across renders ensuring that the memoized value is accessible and up to date Common Use Cases for useRefNow that we ve covered the inner workings of useRef and why it retains its identity across renders let s explore some common use cases for this versatile hook Accessing and Manipulating DOM ElementsOne of the most frequent use cases for useRef is accessing and manipulating DOM elements directly This is particularly useful when you need to perform actions such as focusing on an input field scrolling to a specific element or animating elements Here s an example that demonstrates how to use useRef to focus on an input field import React useRef from react function MyComponent const inputRef useRef null const handleFocusButtonClick gt Focus on the input element using useRef inputRef current focus return lt div gt lt input ref inputRef type text gt lt button onClick handleFocusButtonClick gt Focus Input lt button gt lt div gt In this example inputRef is a useRef object that stores a reference to the lt input gt element When the Focus Input button is clicked the inputRef current focus line is executed and the input field receives focus Storing Mutable Values Without Re rendersUnlike state variables changes to a useRef object s current property do not trigger re renders This makes useRef an excellent choice for storing values that don t impact your component s UI but need to persist between renders Here s an example that uses useRef to store a previous value import React useState useEffect useRef from react function MyComponent const count setCount useState const previousCountRef useRef useEffect gt Update the previous count when count changes previousCountRef current count count return lt div gt lt p gt Current Count count lt p gt lt p gt Previous Count previousCountRef current lt p gt lt button onClick gt setCount count gt Increment lt button gt lt div gt In this example previousCountRef is a useRef object that stores the previous value of count We update it within the useEffect hook whenever count changes The stored value persists across renders without triggering re renders allowing us to display the previous count Optimizing PerformanceuseRef can also be a valuable tool for optimizing performance You can use it to memoize expensive calculations ensuring they are only recomputed when necessary Consider an example where you need to compute a complex value that depends on a set of inputs You can use useRef to store and memoize the result import React useState useEffect useRef from react function MyComponent const inputValue setInputValue useState const result setResult useState null const computationCache useRef useEffect gt if computationCache current inputValue Perform the expensive calculation and store the result in the cache computationCache current inputValue performExpensiveCalculation inputValue Update the result with the cached value setResult computationCache current inputValue inputValue return lt div gt lt input type text value inputValue onChange e gt setInputValue e target value gt lt p gt Result result lt p gt lt div gt In this example we use computationCache as a useRef object to store the results of expensive calculations based on the inputValue If the result for a particular input value is not already in the cache we perform the calculation and store the result in the cache This optimizes performance by avoiding redundant calculations Advanced useRef TechniquesWhile we ve covered the basics of useRef there are advanced techniques and patterns you can explore to leverage its full potential Combining useRef with useEffect for Complex ScenariosuseRef and useEffect can be combined to handle more complex scenarios You can use useRef to manage mutable values or references and useEffect to perform side effects Here s an example where we combine the two to observe changes in the document title import React useEffect useRef from react function MyComponent const documentTitleRef useRef useEffect gt Update the document title if it has changed if document title documentTitleRef current document title documentTitleRef current const handleTitleChange e gt documentTitleRef current e target value return lt div gt lt input type text placeholder Enter new title onChange handleTitleChange gt lt div gt In this example documentTitleRef is a useRef object used to store the document title We combine it with useEffect to observe changes to the documentTitleRef current value and update the document title accordingly This pattern allows us to manage side effects effectively Best Practices and RecommendationsAs you become proficient with useRef here are some best practices and recommendations to keep in mind Use useRef for its intended purpose managing mutable references and values that should not trigger re renders Combine useRef with other hooks when needed For example combine it with useEffect to manage side effects or with useContext to access context values Be mindful of initialization Ensure that useRef objects are initialized appropriately especially when working with DOM elements ConclusionIn this comprehensive guide we ve explored React s useRef hook in depth We ve learned how useRef leverages closures retains its identity across renders and provides a versatile tool for accessing and manipulating DOM elements storing mutable values and optimizing performance We ve also covered advanced techniques and best practices to help you become a master of useRef As you continue to build React applications remember that useRef is not just a tool for accessing the DOM it s a powerful tool for managing state and optimizing performance Whether you re a React novice or an experienced developer mastering useRef will undoubtedly enhance your React skills and make you a more proficient developer So go ahead harness the power of useRef and build more efficient and performant React applications with confidence	2023-08-24 14:21:04
海外TECH	DEV Community	Main-ly Speaking	https://dev.to/colabottles/main-ly-speaking-39np	Main ly SpeakingI tweeted posted out a half joking question the other day about the usage of the lt div gt tag still Then I started a small conversation Then I got to thinking Why are devs not using lt main gt more often The why I ve concluded my accessibility auditing career as of yesterday when I audited an education platform that was extremely inaccessible The documentation was over pages that I sent back to the client That is a lot Not the most but it is a lot Usually pages are par for any high level audit that I have done as a solo consultant The fact that I saw usage of the lt header gt and lt footer gt elements yet so sign of lt main gt was there The elements from HTML used were lt header gt lt nav gt lt section gt lt article gt lt aside gt lt footer gt No lt main gt as far as the eyes could see I mean there was no sign of the element to be found The What Is it fear I mean I know it really isn t fear but is it lack of education yes or is it lack of understanding semantic HTML and the benefits of using semantic HTML over an element that has no semantic meaning I have seen a lot of replies when I have asked this in the past and in years of asking it is usually the same repsonses Don t have time to deal with HTML Not enough time to deal with it now It s X framework and I can t change that You can if it is open source It s habit and I just do it that way What is semantic HTML I m using native apps not hybrid web app These are among a lot of reasons I get it but I got it years ago years ago years ago maybe But in Now that HTML has been out since years ago developers should know about HTML Whether they know is one thing They should You should Whether they care or whether you care is another You all should care I mean if you re using other HTML elements why omit lt main gt That says to me that whomever it may be you re being lazy if you know and if you are uneducated about HTML you re not doing the research lt main gt is one of those elements that is widely known So what Big Deal These landmarks have an impact on accessibility If you have ever read the bulk of my articles they are on accessibility Using HTML landmarks as they are intended is helping out people with disabilities by making the structure of the page accessible to screen reader technology and other assistive technology AT e g keyboard navigation When I see this when I am creating a new project in a framework lt DOCTYPE html gt lt html lang gt lt head gt lt head gt lt body gt lt div id app gt lt div gt lt body gt lt html gt I ll tend to ask when doing an accessibility audit why aren t you using lt main gt and only if it is a web or hybrid app knowing you d have to file an issue and ask for the lt div gt to be changed to lt main gt but that isn t something I d expect to happen but I am not opposed to it at all What I would like to see more of is this if applicable lt DOCTYPE html gt lt html lang gt lt head gt lt head gt lt body gt lt main id app gt lt main gt lt body gt lt html gt The BenefitsSkip to content links When someone using keyboard navigation or AT wants to skip repeated content they can easily skip to the main content area It s the fresh new and cool wrapper div I d use lt div id wrapper gt a lot until then I started to use lt main id wrapper gt or whatnot when using HTML more often in projects It s a landmark why not use it Reader mode looks for the lt main gt element as well as headings and content structure when converting the content into reader view lt main gt is a lot easier for maintenance and code readability You ll be able to visually spot a lt main gt element much faster than a lt div gt within a vast sea of divs in that bowl of div chowder Using lt main gt could also possibly save some bytes within your files CSS or otherwise in that you can use main in the stylesheet instead of using classes or IDs e g main or main Without lt main gt assistive technology cannot create an accurate outline accessibility tree of the page s content and I am sure there are more that I m not listing but the fact is and let s face it if you re going to use all the other HTML landmarks just use the main landmark in a web or hybrid web app or if you are authoring a Web page That s it Don t be scared of lt main gt and if you already weren t just use it if it is applicable in the project If you are not sure of how to use main educate yourself You could read the spec or the MDN docs which should be the de facto resource for researching anything HTML or CSS I get that there are cases where it is a lt div gt and what I am saying is moot I know that I understand that I got it But If you can use lt main gt get it in there and make the experience just a little more accessible Photo by Jas Min on Unsplash	2023-08-24 14:04:54
海外TECH	DEV Community	CSS Selectors, Combination And Avoiding Conflicting Styling; (CSS Selector Mastery and Best practices).	https://dev.to/idowuseyi/css-selectors-combination-and-avoiding-conflicting-styling-css-selector-mastery-and-best-practices-3mg4	CSS Selectors Combination And Avoiding Conflicting Styling CSS Selector Mastery and Best practices IntroductionCascading Style Sheet CSS has stood out as the ultimate tool for styling a webpage While the HTML helps in structuring and outlining our webpage the CSS is used to colour design and style our webpage Let s say our webpage or website is a building the HTML will be the block which are layered to give the shape of the building The CSS will be the painting styling and decoration of our building It is also good to state where JavaScript stands in all of this Ultimately JavaScript is used in maintaining or giving functionality to the elements in our webpage A simple colour combination implemented with CSS can make a lot of difference in a web page or site Though there are many things to learn about CSS styling in this article you will learn about CSS selectors and how to avoid conflicting styling in your web projects Table of ContentWhat are CSS selectorsi What is CSSii What are selectorsWhat are the uses of different CSS selectorsi What are the different CSS selectors availableii What are the specific uses of CSS selectorsExamples of different CSS selectors and their uniqueness i Examples of different CSS selectorsii What are the uniqueness of each CSS selectorCombination of different CSS selectors with examplesi Pick amp Mix Selectorsa Multiple selectorsb Hierarchical Selectorsc Combined Selectorsii What is the difference between the one with space and one without space How to avoid conflicting styling in our web designi Understanding conflicting styling in web designii What are the major causes of conflicting stylingiii Ways and How to avoid conflict stylingiv Principles and best practices in good CSS styling PrerequisitesTo get the most out of this guide it is expected that you should have a basic understanding of HTML CSS and or JavaScript If you are not familiar with these technologies we recommend that you take some few minutes checking them out to familiarise yourself with them before you proceed with this guide What are CSS selectorsBefore we look at CSS selectors it is important to understand CSS itself So we will quickly look at the following to properly understand CSS and CSS selectors i What is CSS According to the several sources including official documentation tutorials and books Cascading Style Sheet CSS can be defined as a style language used to describe the presentation and formatting of a document written in a markup language such as HyperText Markup Language HTML or XML It allows developers and web designers to control the layout design and appearance of web pages making it easier to separate content from presentation For example if our web page is a building the markup language HTML will be used for the layed blocks or structure of the building while our CSS will be used for the painting designing and decorating of our building lt DOCTYPE html gt lt html lang en gt lt head gt lt meta charset UTF gt lt meta http equiv X UA Compatible content IE edge gt lt meta name viewport content width device width initial scale gt lt title gt Document lt title gt lt head gt lt body gt lt h gt Hello World lt h gt lt body gt lt html gt Note You can generate the above by pressing control button exclamation mark in vs code If we put the above in a filename html file and open it with any browser A white page with a black Hello World text is displayed Let say we want the colour of the text to be red this is where CSS comes in We can include some style in the markup above by doing the below lt DOCTYPE html gt lt html lang en gt lt head gt lt meta charset UTF gt lt meta http equiv X UA Compatible content IE edge gt lt meta name viewport content width device width initial scale gt lt title gt Document lt title gt lt head gt lt body gt lt h style color red gt Hello World lt h gt lt body gt lt html gt Note the difference ii What are selectors Selectors can be referred to as markers or reference names with which we can style our HTML elements In writing a good CSS it is always good to keep all our CSS and styling files in a separate file This is good practice Most of the time software engineers or developers name this file styles css So instead of including our CSS styling in our HTML we will keep it in a separate file Atimes some put it in a separate folder entirely Create a new file named style css in the same folder where we have the html file All our css styling will be written in this CSS file To style our h heading above first we need to remove the inline styling in the h above so that our style can reflect Now in our CSS file we can use a selector to select our h and then write our style See the sample below In our CSS file write or paste the styling below h color red This changes the colour of our h just as we have it when we write it within the h tag in our html file This is what we call an external CSS and for it to work we have to connect it to our html file by including the below within the head of our html file lt link rel stylesheet href style css gt In the example above h is a selector What are the uses of different CSS selectorsAs we have seen above selector is simply a reference with which we can use to apply styles on our HTML elements They are used as references through which we can apply a distinct or unique styling to any HTML elements i What are the different CSS selectors available Imagine if we only have one selector and we have multiple h in our HTML document Applying a different style to each of them would have been impossible because if the browser sees a different style for a single element the last one is retained Take a look lt DOCTYPE html gt lt html lang en gt lt head gt lt meta charset UTF gt lt meta http equiv X UA Compatible content IE edge gt lt meta name viewport content width device width initial scale gt lt link rel stylesheet href style css gt lt title gt My page lt title gt lt head gt lt body gt lt h gt Welcome to my site lt h gt lt h gt First Selector lt h gt lt p gt This is a paragraph tag We can include many sentences within here lt p gt lt h gt Second Selector lt h gt lt p gt HTML is for layout It is for inputting and arranging our document in our webpage lt p gt lt body gt lt html gt In our style css Let say we want to apply different bacground color to the hh background color black h background color brown The background color that we will see for both h will be brown This is because the h tag selects all the h elements in our HTML So what is the way out Important point to note In styling application on html markup with CSS If there are two styles on the same element or html tag the last styling is what is applied This is well proven by what we have above We have two different styles on the h but the style further down the line of code is what is applied This is one of the most important rules to have in mind why using CSS There are other CSS selectors we can use This includes a HTML tagname b class c id ii What are the specific uses of CSS selectorsAs we know all CSS selectors can be used to apply style to our HTML elements With the different selectors above each HTML element or content on our webpage or a group of content on our web page can have a unique style applied to them separately or as a group Examples of different CSS selectors and their uniquenessYou might be wondering what are the differences between all these CSS selectors Each of these selectors although have a lot of similarities but they also have their uniqueness i Examples of different CSS selectorsTake a look at this Lets edit our body in the HTML above to the one below lt body gt lt section id section gt lt h class header brown gt Welcome to my site lt h gt lt h class blue gt First Selector lt h gt lt p class brown gt This is a paragraph tag We can include many sentences within here lt p gt lt h class brown gt Second Selector lt h gt lt p class blue gt HTML is for layout It is for inputting and arranging our document in our webpage lt p gt lt section gt lt body gt Then in our style css let s include the following stylesbody background color fff section font family sans serif header font size rem line height font weight color fff h font size rem blue color blue brown color brown You can try to predict how the page will look like Check it belowThere are many things to note about our output as displayed here The body and h are HTML tag selectors header blue brown are all class selectors while section is an id It is important to pay attention to how each of them are used By carefully using our CSS selectors we can apply multiple styles and unique styles to any HTML element ii What are the uniqueness of each CSS selector It is important to know the uniqueness of each of these CSS selectors The first way to establish this is by their usage in our styling We can look at how they are used also in both our HTML and also in our CSS file a Looking at the way they are used or appear in each of our files For HTML tag name if we have lt h gt Heading lt h gt in our CSS we can say h our style Just like we have above body and h are HTML tagname used in styling For example the ash backgound color on our output in our browser was a style applied to the body For Class we include class classname within the opening tag of our HTML element Looking at the usage we use classname our style to apply a specific style to our an HTML element using the classname Looking at our sample above our h first paragraph and second h content has the color brown because of the style on the class brown Look at the word brown in our HTML file and brown in our style css With this we are able to apply same style to multiple elements using classes For id it has almost the same implementation with class in our HTML file The difference is that for id we use id in our html and in our css we use idname to style it b Another way to consider their uniqueness is in the priority and peculiarity of each of them In order of priority id is the most It is the most prioritised in an external styling followed by a class and then HTML tagname id are the most unique and has special usage case which include the following Unlike a class that can be used on many elements at a time a particular id can not occur twice in an HTML file It is the most prioritised in an external CSS styling Combination of different CSS selectors with examples We can also combine the selectors to pick specific HTML elements to style in our CSS i Pick amp Mix Selectors a Multiple selectorsa selector another selector Say we have an h and p with colour red We can just have the below in our CSS file h p color red b Hierarchical SelectorsThis is selected by hierarchy That is selection based on the hierarchy of the selectorsE g title container fluid padding top text align left selector selectorThe first selector is a parent while the nd is a child So in using this we will go from outside in selecting the parents till we get to the specific child container fluid h color red Then we read the hierarchy from right to left The one on the right is the child and the one on the left is the parent c Combined SelectorsThis is combining selectorselector selector display flex padding px selector selectorWe will read this from left to right ii What is the difference between the one with space and one without space Without the separator we are targeting an element that has the classes we state but with the space it means we are following the hierarchy moving from the parent to child It is good to remember this about selectors they have hierarchy id s that are the most specific which means they take much priority and then classes and lastly HTML tags Also it is good to note that the last styling will always be applied Also class selector is superior to HTML tag while id is superior to class and HTML tag These are CSS rules Then also inline CSS is the strongest when it comes to where our styling is positioned How to avoid to avoid conflicting styling in our web designIt is important to understand the ways and methods to avoid conflicting styling in our development We can have style conflict when the style implemented by the browser is different from the one specified by the designer or the developer This can be very frustrating at times i Understanding conflicting styling in web designConflicting styling is when the style on our page output by the browser is different from the one specified in our code If you observe this you can inspect the page by right clicking on the browser then select inspect Chrome is a good tool to see what style is applied on what element on the page ii What are the major causes of conflicting stylingConflicting styling can occur from any of the following a Having multiple forms of styling e g having inline internal and external or any two together b Having multiple style sources This can cause style conflict that is not properly addressed or monitored c Omitting separators and proper formatting of styles d Improper linking of style files in HTML files iii Ways and How to avoid conflict stylingWays to avoid conflict styling is to ensure to carefully attend to everything stated above and sticking to best practices in CSS styling iv Principles and best practices in good CSS stylinga Use id s very sparingly Not only that you have one of those things but that it is distinct so use class instead Only use id when you need to but always consider using class first b When you want to use a class always use one class Try to apply to only one class as much as possible c Avoid inline styling as much as possible It is a very bad practice so don t do it Keeping to all the above helps you reduce debugging to the barest minimum ConclusionNow that you have properly mastered CSS selectors and best practices for great styling make further effort to refactor your previous stylings practise what you have learnt and work on more web design projects using HTML CSS and JavaScript	2023-08-24 14:04:33
Apple	AppleInsider - Frontpage News	How to turn on Walking Steadiness notifications in iOS 16	https://appleinsider.com/inside/ios-16/tips/how-to-turn-on-walking-steadiness-notifications-in-ios-16?utm_medium=rss	How to turn on Walking Steadiness notifications in iOS Walking Steadiness is a helpful tool for older folks to know their risk of falling Here s how to turn on walking steadiness notifications in iOS Walking steadiness informationAvailable on iPhone or later and iOS or later Walking Steadiness uses algorithms to track metrics such as walking speed step length walking asymmetry and double support time Read more	2023-08-24 14:53:57
Apple	AppleInsider - Frontpage News	Daily deals Aug. 24: $249 Beats Studio Pro, $1,099 15" MacBook Air, $100 off iPad mini, more	https://appleinsider.com/articles/23/08/24/daily-deals-aug-24-249-beats-studio-pro-1099-15-macbook-air-100-off-ipad-mini-more?utm_medium=rss	Daily deals Aug Beats Studio Pro quot MacBook Air off iPad mini moreToday s hottest deals include off Beats Studio Pro headphones off Sony wireless Bluetooth headphones off a Prettycare robot vacuum off an Optoma short throw K UHD projector and more Save on a iMacThe AppleInsider crew combs the web for stellar deals at ecommerce stores to showcase unbeatable bargains on popular tech items including deals on Apple gear TVs accessories and other gadgets We post the most valuable deals daily to help you save money Read more	2023-08-24 14:37:51
Apple	AppleInsider - Frontpage News	Apple celebrates National Parks and the work of restoring El Capitan Meadow	https://appleinsider.com/articles/23/08/24/apple-celebrates-national-parks-and-the-work-of-restoring-el-capitan-meadow?utm_medium=rss	Apple celebrates National Parks and the work of restoring El Capitan MeadowFor its annual celebration of US National Parks Apple has spotlighted the efforts of Yosemite Ancestral Stewards to restore a sacred black oak grove in El Capitan Meadow Preserving Yosemite National Park Source Apple Apple has long been celebrating and supporting the preservation of National Parks with donations Apple Watch activity challenges and also fundraising via Apple Pay Plus it s named macOS after Yosemite in and El Capitan in Read more	2023-08-24 14:25:58
海外TECH	Engadget	Discord's March data breach only affected 180 users, but it's worth a security checkup	https://www.engadget.com/discord-data-breach-personal-information-discordio-shutdown-142950237.html?src=rss	Discord x s March data breach only affected users but it x s worth a security checkupDiscord started notifying users affected by a March data breach on Monday about three months after the communications server went public about the attack in May Of the million monthly users that Discord reports to have only had sensitive information exposed in the attack according to a data breach notification filed with the Office of the Maine Attorney General That means if you re a Discord user you re much more likely to be impacted by the Discord io breach that impacted users earlier this month and ultimately led to the site shutting down nbsp Discord io let Discord users make custom links for their channels On August a major data breach caused by a vulnerability in the website s code let a third party attacker steal information and put it up for sale on a breached data forum That includes hashed passwords billing information and Discord IDs quot We have decided to take down our site until further notice quot Discord io wrote in a post The company plans a quot a complete rewrite of our website s code as well as a complete overhaul of our security practices quot as it looks for a way to mitigate the breach and prevent future problems This is different from the Discord breach that the company may have reached out to you about this week A separate incident affecting Discord and not the separate Discord io entity happened earlier this year when an unauthorized user gained access to Discord data via a third party service provider The hacker stole data on service tickets which included personal information like driver s license numbers for users Discord is reaching out via email to let impacted users know about the incident and offering credit monitoring and identity theft protection services to prevent further damage nbsp This article originally appeared on Engadget at	2023-08-24 14:29:50
海外TECH	Engadget	A live CNN streaming channel is coming to Max in September	https://www.engadget.com/a-live-cnn-streaming-channel-is-coming-to-max-in-september-141316706.html?src=rss	A live CNN streaming channel is coming to Max in SeptemberCNN lasted barely over a month before Warner Bros Discovery pulled the plug last year amid reports of abysmally lower viewer numbers But the company still thinks there s room for live news from CNN on a streaming service It s bringing CNN Max to all Max tiers in the US at no extra cost on September th The new round the clock service will “be part of an open beta for news that will enable experimentation with product features content offerings and original storytelling all with the input and feedback from the Max community quot WBD said in a press release CNN Max will feature original programming as well as live programs from CNN US and CNN International New shows include CNN Newsroom with Jim Acosta Rahel Solomon Amara Walker and Fredricka Whitfield and CNN Newsroom with Jim Sciutto The streaming channel will feature several CNN tentpoles as well like Amanpour Anderson Cooper The Lead with Jake Tapper and The Situation Room with Wolf Blitzer Meanwhile WBD will rename Max s CNN Originals hub to CNN Max Non news CNN programming like Anthony Bourdain Parts Unknown and Stanley Tucci Searching for Italy will be available through this hub along with the new channel and more than episodes of new and classic programming CNN Max is perhaps a less risky bet for WBD than CNN CNN sank hundreds of millions of dollars into that endeavor CNN was more personality centric while it seems CNN Max will be aligned with CNN proper s approach to news Having a blend of CNN and original programming should help keep costs down too This article originally appeared on Engadget at	2023-08-24 14:13:16
Java	Java Code Geeks	Querying Graphs with Neo4j Cheatsheet	https://www.javacodegeeks.com/querying-graphs-with-neo4j-cheatsheet	Querying Graphs with Neoj Cheatsheet Introduction to Neoj Neoj is a leading graph database management system that enables efficient storage and Querying Graphs of connected data It s designed to work with highly interconnected data models making it suitable for applications such as social networks recommendation systems fraud detection and more Key Concepts ConceptDescriptionNodesFundamental building blocks representing entities in the	2023-08-24 14:06:37
海外科学	NYT > Science	India’s Moon Landing Offers Blueprint For Other Countries Dreaming Big	https://www.nytimes.com/2023/08/24/world/asia/india-chandrayaan-3-moon-landing-space.html	bigits	2023-08-24 14:39:57
ニュース	BBC News - Home	Asylum backlog rises to record high, official figures show	https://www.bbc.co.uk/news/uk-66603767?at_medium=RSS&at_campaign=KARANGA	office	2023-08-24 14:21:41
ニュース	BBC News - Home	Mary Earps: Nike will sell 'limited quantities' of England World Cup goalkeeper shirts	https://www.bbc.co.uk/sport/football/66607749?at_medium=RSS&at_campaign=KARANGA	Mary Earps Nike will sell x limited quantities x of England World Cup goalkeeper shirtsEngland fans will be able to buy Mary Earps replica goalkeeper shirts after Nike say limited quantities would go on sale	2023-08-24 14:08:59
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ニュース	BBC News - Home	Glyn Razzell refuses to reveal where his wife Linda's body is	https://www.bbc.co.uk/news/uk-england-wiltshire-66603784?at_medium=RSS&at_campaign=KARANGA	murder	2023-08-24 14:15:06
ニュース	BBC News - Home	Aled Jones: Boy threatened to cut off Welsh singer's arm with machete	https://www.bbc.co.uk/news/uk-england-london-66604588?at_medium=RSS&at_campaign=KARANGA	london	2023-08-24 14:11:35
ニュース	BBC News - Home	Labour Party spent more than Conservatives in 2022	https://www.bbc.co.uk/news/uk-politics-66605159?at_medium=RSS&at_campaign=KARANGA	previous	2023-08-24 14:31:57
ニュース	BBC News - Home	Rugby World Cup 2023: England wing Anthony Watson ruled out of the World Cup	https://www.bbc.co.uk/sport/rugby-union/66608039?at_medium=RSS&at_campaign=KARANGA	injury	2023-08-24 14:50:40
ニュース	BBC News - Home	World Athletics Championships 2023: Race walker proposes at finish line	https://www.bbc.co.uk/sport/av/athletics/66608857?at_medium=RSS&at_campaign=KARANGA	World Athletics Championships Race walker proposes at finish lineWatch as Hana Burzalova and her team mate Dominik Cerny get engaged as she crosses the finish line of the women s k race walk at the World Athletics Championships in Budapest	2023-08-24 14:19:20
ビジネス	不景気.com	幸楽苑HDが通販事業から撤退、各ECモール店を閉店へ - 不景気com	https://www.fukeiki.com/2023/08/kourakuen-end-ec-store.html	幸楽苑ホールディングス	2023-08-24 14:21:11