投稿時間:2022-02-04 21:29:41 RSSフィード2022-02-04 21:00 分まとめ(33件)

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IT	気になる、記になる…	CYRILL、｢ iPhone 13 Pro/13 Pro Max｣向けMagsafeケース｢カラーブリックマグ｣を発売 − 30％オフキャンペーンも	https://taisy0.com/2022/02/04/151651.html	cyrill	2022-02-04 11:13:27
IT	気になる、記になる…	Anker、｢楽天お買い物マラソン｣で対象製品を最大25％オフで販売するセールを開催中（2月11日まで）	https://taisy0.com/2022/02/04/151648.html	anker	2022-02-04 11:06:44
IT	気になる、記になる…	楽天市場、恒例の｢お買い物マラソン｣のキャンペーンを開始 − ｢iPad Air｣や｢iPad｣がポイント5倍に	https://taisy0.com/2022/02/04/151586.html	ipadair	2022-02-04 11:00:28
IT	ITmedia 総合記事一覧	[ITmedia Mobile] 「BALMUDA Phoneはやって良かった」「Y!mobileが爆発している」　ソフトバンク宮川社長が語ったこと	https://www.itmedia.co.jp/mobile/articles/2202/04/news167.html	balmudaphone	2022-02-04 20:43:00
海外TECH	MakeUseOf	Will the Joe Rogan Controversy Help or Hinder Spotify?	https://www.makeuseof.com/joe-rogan-spotify-controversy-help-hinder/	rogan	2022-02-04 11:40:43
海外TECH	MakeUseOf	Yes, You Can Code on the Go: 7 of the Best HTML Editors for Android	https://www.makeuseof.com/tag/best-4-html-editors-for-android-si/	android	2022-02-04 11:30:12
海外TECH	MakeUseOf	What Is a 51% Attack?	https://www.makeuseof.com/51-percent-attack/	attack	2022-02-04 11:15:12
海外TECH	DEV Community	10 Must-Know Patterns for Writing Clean Code with React and TypeScript✨🛀	https://dev.to/alexomeyer/10-must-know-patterns-for-writing-clean-code-with-react-and-typescript-1m0g	Must Know Patterns for Writing Clean Code with React and TypeScriptReact is a JavaScript library and it is the most popular and industry leading frontend development library today JavaScript is a loosely typed language and as a result it catches runtime The result of this is that JavaScript errors are caught very late and this can lead to nasty bugs As a JavaScript library React inherits this problem Clean code is a consistent style of programming that makes your code easier to write read and maintain Anyone can write code that a computer can understand but good developers write clean code code that humans can understand Clean code is a reader focused development style that improves our software quality and maintainability Writing clean code involves writing codes with clear and simple design patterns that makes it easy for humans to read test and maintain Consequently clean code can lower the cost of software development And this is because the principles involved in writing clean code eliminates technical debts In this article we would look at some useful patterns to use when working with React and TypeScript To make it easier for your team to keep codebase healthy and prioritise technical debt work try out Stepsize issue tracker in the editor It helps Engineers create technical issues add them to your sprint and address tech debt continuously Now let s learn about the ten useful patterns to apply when using React and Typescript Use Default import to import ReactConsider the code below While the code above works it is confusing and not a good practice to import all the contents of React if we are not using them A better pattern is to use default export as seen below With this approach we can destructure what we need from the react module instead of importing all the contents Note To use this option we need to configure the tsconfig json file as seen below In the code above by setting esModuleInterop to true we enable allowSyntheticDefaultImports http allowsyntheticdefaultimports which is important for TypeScript to support our syntax Declare types before runtime implementationConsider the code below The code above can be cleaner and more readable if we separate the runtime and compile time declarations And this is done by declaring the types ーthe compile type declarations first Consider the code below Now at first glance a developer knows what the component API looks like since the first line of the code clearly shows this Also we have separated our compile time declarations from our runtime declarations Always provide explicit type of children PropsTypeScript mirrors how React handles children props by annotating it as optional in the react d ts for both functional and class components Consequently we are required to explicitly provide a type for the children props However it is best practice to always explicitly annotate children props with a type This is useful in cases where we want to use children for content projection and if our component does not use it we can simply annotate it with the never type Consider the code below Below are some valid types to annotate the children props ReactNode ReactChild ReactElementFor primitive we can use string number booleanObject and Arrays are also valid typesnever null undefined Note null and undefined are not recommended Use type inference for defining a component state or DefaultPropsConsider the code below While the code above works we can refactor it for the following improvements To enable TypeScript s type system to correctly infer readonly types such as DefaultProps and initialStateTo prevent developer bugs arising from accidentally setting state this state Consider the code below In the code above by freezing the DefaultProps and initialState the TypeScript type system can now infer them as readonly types Also by marking both static defaultProps and state as readonly within the class we eliminate the possibility of runtime errors arising from setting state as mentioned above Use type alias instead of interface for declaring Props StateWhile interface can be used for consistency and clearness sake it is best to use type alias as there are cases where interface cannot work For instance in the previous example we refactored our code to enable TypeScript s type system to correctly infer readonly types by defining state type from implementation We cannot use interface with this pattern as seen in the code below Also we cannot extend interface with types created by unions and intersection so in these cases we would have to use type alias Don t use method declaration within interface type aliasThis ensures pattern consistency in our code as all members of type inference are declared in the same way Also strictFunctionTypes works only when comparing functions and does not apply to methods You can get further explanation from this TS issue Consider the code below Don t use FunctionComponentOr its shorthand FC to define a function component When using TypeScript with React functional components can be written in two ways As normal functions as seen in the code below Using the React FC or React FunctionComponent as seen below Using FC provides some advantages such as type checking and autocomplete for static properties like displayName propTypes and defaultProps But it has a known issue of breaking defaultProps and other props propTypes contextTypes displayName FC also provides an implicit type for children prop which also have known issues Also as discussed earlier a component API should be explicit so an implicit type for children prop is not the best Don t use constructor for class componentsWith the new class fields proposal there is no need to use constructors in JavaScript classes anymore Using constructors involves calling super and passing props and this introduces unnecessary boilerplate plate and complexity We can write cleaner and more maintainable React class components by using class fields as seen below In the code above we see that using class fields involves less boilerplate and we don t have to deal with the this variable Don t use public accessor within classesConsider the code below Since all members in a class are public by default and at runtime there is no need to add extra boilerplate by explicitly using the public keyword Instead use the pattern below Don t use private accessor within Component classConsider the code below In the code above the private accessor only makes the fetchProfileByID method private on compile time since it it is simply a TypeScript emulation However at runtime the fetchProfileByID method is still public There are different ways to make the properties methods private in a JavaScript class private one is to use the underscore naming convention as seen below While this does not really make the fetchProfileByID method private it does a good job of communicating our intention to fellow developers that the specified method should be treated as a private method Other techniques involve using weakmaps symbols and scoped variables But with the new ECMAScript class fields proposal we can do this easily and gracefully by using private fields as seen below And TypeScript supports the new JavaScript syntax for private fields from version and above Bonus Don t use enumAlthough enum is a reserved word in JavaScript using enum is not a standard idiomatic JavaScript pattern But if you are coming from a language like C or JAVA it might be very tempting to use enums However there are better patterns such as using compile type literals as seen below ConclusionUsing TypeScript no doubt adds a lot of extra boilerplate to your code but the benefit is more than worth it Above are some best practices and idiomatic JavaScript patterns to apply when using React and TypeScript to make your code cleaner and better This post was written by Lawrence Eagles a full stack Javascript developer a Linux lover a passionate tutor and a technical writer Lawrence brings a strong blend of creativity amp simplicity When not coding or writing he love watching Basketball️	2022-02-04 11:48:51
海外TECH	DEV Community	How to Build a Cryptocurrency Exchange App in 2022	https://dev.to/vironit/how-to-build-a-cryptocurrency-exchange-app-in-2022-187d	How to Build a Cryptocurrency Exchange App in A crypto exchange app is like a marketplace which offers a portal where you can create different order types to buy sell and speculate on cryptocurrencies with other users But how to open your own cryptocurrency exchange app Let s dive deeper Before Start Choose Option to Create a Cryptocurrency Exchange AppIf you lack the technical skills to handle it on your own we recommend starting with these options Purchase a white label solution Develop a custom app from scratchThis way you can get your app in front of the right people fast Now let s take a closer look at the second option Choose Cryptocurrency Exchange TypeCrypto exchanges can be either centralized meaning they are managed by one corporate authority or decentralized where they generally distribute verification powers to anyone willing to join a network and certify transactions There is also hybrid option or peer peer crypto exchangeThe differences between options are best illustrated with a comparison table  CriteriaCEX DEX HybridLiquidityHighLowLowUI amp UXEasy to useHard to useEasy to useMatching speedVery fastSlowFastCustodyUsers trust CEXUsers own their fundsUsers own their fundsTrading volumeHighLowLowFeaturesUnlimitedLimitedLimitedFiat gatewayYesNoYes Keep an Eye on JurisdictionJurisdictions under which to start a crypto exchange app vary greatly from region to region from a clear set of regulations to a complete lack of regulation For example Malta Gibraltar Switzerland or Singapore now stand out as attractive countries for those wishing to open a cryptocurrency exchange However you will still need to keep an eye on legislative changes Think about Architecture Technology Stack and APIAn exchange architecture usually refers to a platform structure that helps define the relationship and the way all the components of an exchange interact the login screen trading engine user interface security features APIs databases etc Find a Liquidity ProviderThe success and competitiveness of your exchange business will greatly depend on liquidity how long it takes to exchange an asset for its money equivalent As you know customers will always choose an exchange with good liquidity that can offer a narrower spread Take Care of Transparency amp SecurityThe cryptocurrency market attracts not only new members but also scammers So you should constantly improve the security of your app by various methods like two factor authentication cold and hot wallets database encryption etc Test your Crypto ExchangeNow it s time to test your application Note that the scope of testing should cover an assessment of overall system performance functionality speed and security Remember also to collect user feedback and make necessary improvements to ensure smooth operation and improve the UX Ensure the Sustainability of Business ProcessesIn addition to preparing for the launch and gaining an initial customer base you should implement processes that will improve user loyalty For example you can provide ongoing customer support and take care of your asset management strategy  Read the full article by VironIT to find out more examples explanations and development costs for the most popular cryptocurrency exchange apps like Binance Crypto com and Coinbase	2022-02-04 11:11:23
Apple	AppleInsider - Frontpage News	Amazon Prime raising annual subscription to $139	https://appleinsider.com/articles/22/02/04/amazon-prime-raising-annual-subscription-to-139?utm_medium=rss	Amazon Prime raising annual subscription to The cost of an annual Amazon Prime subscription is to rise to while the monthly fee rises to Following Netflix s price rise in January Amazon Prime is to roll out the new charge from February It s the first time Amazon has raised the price of Prime since The news came in the documentation supporting Amazon Prime s latest financial earnings report Read more	2022-02-04 11:40:54
Apple	AppleInsider - Frontpage News	Apple wants 27% commission for Dutch apps using third-party payments	https://appleinsider.com/articles/22/02/04/apple-cuts-commission-by-3-for-dutch-apps-using-third-party-payments?utm_medium=rss	Apple wants commission for Dutch apps using third party paymentsFollowing changes to the App Store to comply with the Netherlands law Apple has revealed that it will cut its commission to for eligible apps Apple intends to continue disputing the Netherlands ruling that says it has to allow the developers of dating apps to provide alternative payment methods However it is complying with the order and having first detailed how developers can use third party systems has now revealed its fees Read more	2022-02-04 11:57:44
海外TECH	Engadget	Coinbase partners with TurboTax to let you receive tax refunds in cryptocurrency	https://www.engadget.com/coinbase-turbotax-tax-refunds-cryptocurrency-115551748.html?src=rss	Coinbase partners with TurboTax to let you receive tax refunds in cryptocurrencyIf you use TurboTax to file taxes you now have the option to deposit your refund directly to a Coinbase account The money can either be deposited in USD or be sent to your account already converted to any of the types of cryptocurrency available Coinbase says the choices include stablecoins that are pegged to a real currency and fluctuate much less than typical crypto coins You won t be charged with any trading fees if you choose to get your refund in crypto but you ll still be able to immediately convert your money into the cryptocurrency of your choice if you opt to get it in USD first nbsp To be able to take advantage of the companies partnership you d have to file from the Coinbase section of the TurboTax website All TurboTax customers can file from the page even those using the free option for simple tax returns that only need a W It does have a maximum deposit amount of per day but that probably won t be a problem for most people TurboTax will help you set up a Coinbase account if you don t have one yet and you ll have to follow the steps you see afterwards to be able to deposit your refund to the exchange s quot MetaBank quot The exchange said in its blog post quot Coinbase is committed to giving everyone instant and easy access to the cryptoeconomy We ll continue to enable new use cases that allow customers to transition more of their financial lives to the cryptoeconomy quot Coinbase has launched quite a few ways to make cryptocurrency more available over the past year including opening up a feature that lets you deposit paychecks to its system and another that lets you link it to your PayPal account nbsp	2022-02-04 11:55:51
海外TECH	Engadget	Boston's Federal Reserve says it has solved technical challenges of a 'digital dollar'	https://www.engadget.com/boston-federal-reserve-says-it-has-solved-technical-challenges-of-a-digital-dollar-111209132.html?src=rss	Boston x s Federal Reserve says it has solved technical challenges of a x digital dollar x The US Federal Reserve is continuing its research into a quot digital dollar quot and has unveiled a technical specification for how it might work The Washington Post has reported Researchers designed a system that can handle more than million transaction a second and settle payments in under two seconds while operating without service outages according to a new paper on the subject nbsp The quot Project Hamilton quot research into a central bank digital currency CBDC was developed strictly to test the feasibility of a digital currency and not to give any recommendations as to whether the Fed should create one It s based on the open source research software OpenCBDC according to the researchers from MIT s Digital Currency Initiative and the Federal Reserve Bank of Boston nbsp The team said they aimed to solve the technical challenges of an CDBC while making it flexible depending on how policymakers decided implement a digital currency If it was ever adopted it could allow people who lack bank accounts to gain financial services while making cross border payments easier and more secure The work is still in the early stages however and issues like privacy and ease of exchange with foreign currencies still need to be studied nbsp The Federal Reserve has been publicly investigating a digital currency for just a short time having announced plans to carry out research in May of last year The US has been behind other nations particularly China with the development of digital currencies Central banks control CBDCs making them more stable than cryptocurrencies which can have wild swings in value over short periods of time nbsp Last month the Fed released a study detailing the pros and cons of a central bank currency It deliberately avoided taking a stance on whether it should pursue the technology as any such decision would be made by Congress and other policymakers Rather it focused on the potential benefits and pitfalls It said on the one hand that a digital currency could make financial services more inclusive but also warned that it would need to protect privacy guard against financial crimes and be resilient nbsp Along with the results the researchers have open source code for the platform with the aim of gaining input from the public quot There are still many remaining challenges in determining whether or how to adopt a central bank payment system for the United States quot said MIT s Digital Currency Initiative director Neha Narula nbsp	2022-02-04 11:12:09
金融	RSS FILE - 日本証券業協会	協会員の異動状況等	https://www.jsda.or.jp/kyoukaiin/kyoukaiin/kanyuu/index.html	異動	2022-02-04 13:00:00
ニュース	BBC News - Home	Boris Johnson rocked by wave of No 10 resignations	https://www.bbc.co.uk/news/uk-politics-60253231?at_medium=RSS&at_campaign=KARANGA	leadership	2022-02-04 11:29:22
ニュース	BBC News - Home	Children's mental health: Huge rise in severe cases, BBC analysis reveals	https://www.bbc.co.uk/news/education-60197150?at_medium=RSS&at_campaign=KARANGA	issues	2022-02-04 11:39:12
ニュース	BBC News - Home	Carlisle modern slavery boss given suspended sentence	https://www.bbc.co.uk/news/uk-england-cumbria-60256915?at_medium=RSS&at_campaign=KARANGA	charge	2022-02-04 11:34:33
ニュース	BBC News - Home	Six Nations: Wales-Ireland kit clash frustrates colour-blind fans	https://www.bbc.co.uk/news/uk-wales-60229589?at_medium=RSS&at_campaign=KARANGA	people	2022-02-04 11:10:05
ニュース	BBC News - Home	Brexit: The NI Protocol and its economic impact	https://www.bbc.co.uk/news/uk-northern-ireland-60259342?at_medium=RSS&at_campaign=KARANGA	protocol	2022-02-04 11:16:02
ニュース	BBC News - Home	'We'd be crazy not to be' - Klopp says Liverpool still keen on Fulham's Carvalho	https://www.bbc.co.uk/sport/football/60256930?at_medium=RSS&at_campaign=KARANGA	x We x d be crazy not to be x Klopp says Liverpool still keen on Fulham x s CarvalhoJurgen Klopp says Liverpool would be crazy if they were not still interested in Fulham s Fabio Carvalho after failing to seal a deadline day deal	2022-02-04 11:04:16
ビジネス	ダイヤモンド・オンライン - 新着記事	来週（2/7～11）の日経平均株価の予想レンジは、 2万7000～2万8500円！ 東京に緊急事態宣言が出る 可能性が低下し、押し目買い意欲が強まる展開に期待 - 来週の日経平均株価の予想レンジを発表！	https://diamond.jp/articles/-/295442		2022-02-04 20:20:00
サブカルネタ	ラーブロ	旭川ラーメン　蘇州ラーメン五条軒 みそ篇	http://ra-blog.net/modules/rssc/single_feed.php?fid=196179	旭川ラーメン	2022-02-04 11:17:34
北海道	北海道新聞	星出さん、宇宙基地まだ使える　帰国後初会見「技術獲得に重要」	https://www.hokkaido-np.co.jp/article/641964/	国際宇宙ステーション	2022-02-04 20:16:27
北海道	北海道新聞	東京マラソン、全選手にＰＣＲ　検査義務、方針を変更	https://www.hokkaido-np.co.jp/article/641941/	東京マラソン	2022-02-04 20:16:23
北海道	北海道新聞	中ロ、米欧にらみ結束誇示　習氏「国家の利益維持」	https://www.hokkaido-np.co.jp/article/641966/	北京冬季五輪	2022-02-04 20:16:05
北海道	北海道新聞	中国の新疆、装甲車出動で緊張　ウイグル族「五輪は見ない」	https://www.hokkaido-np.co.jp/article/641980/	人権侵害	2022-02-04 20:11:07
北海道	北海道新聞	「富岳」で小林陵侑を解析　ジャンプ後半、揚力が増加	https://www.hokkaido-np.co.jp/article/641970/	小林陵侑	2022-02-04 20:14:17
北海道	北海道新聞	伊藤詩織さん側が上告　名誉毀損認定に不服	https://www.hokkaido-np.co.jp/article/641985/	精神的苦痛	2022-02-04 20:14:13
北海道	北海道新聞	香港、国安法違反で活動家逮捕　五輪巡り抗議計画か	https://www.hokkaido-np.co.jp/article/641988/	香港	2022-02-04 20:14:03
北海道	北海道新聞	大阪で１万３５６１人感染　登録遅れ２９２１人含む	https://www.hokkaido-np.co.jp/article/642004/	新型コロナウイルス	2022-02-04 20:12:08
北海道	北海道新聞	盛り土経緯解明へ１３人招致　熱海、起点所有者は証人喚問方針	https://www.hokkaido-np.co.jp/article/642007/	証人喚問	2022-02-04 20:12:06
北海道	北海道新聞	羽生結弦、五輪はコーチ不在か　オーサー氏が「彼の決断」	https://www.hokkaido-np.co.jp/article/641975/	羽生結弦	2022-02-04 20:10:14
仮想通貨	BITPRESS（ビットプレス）	日本ブロックチェーン協会、3/7-3/19で「JBA Blockchain Hackathon 2022 Spring」開催	https://bitpress.jp/count2/3_15_13044	blockchain	2022-02-04 20:49:53