投稿時間:2022-05-30 06:15:25 RSSフィード2022-05-30 06:00 分まとめ(17件)

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海外TECH	DEV Community	useState() is such a powerful hook	https://dev.to/jaythoven/usestate-is-just-a-powerful-hook-5fcb	useState is such a powerful hookSo I begin yet another blog post by prefacing just how terrible I am at coding My skill level or lack thereof is improving however but just how much can one know when they basically have embarked on this journey just weeks ago Needless to say this post is going to reflect on the USE ofuseState within React See what I did there Yes I am corny but aware enough to know I am doing it on purpose Ha This is a topic that I could not wrap my head around at first Even now after passing my code challenge at Flatiron School do I really know what I m doing or talking about Hopefully the answer is a yes and you understand where I go with this It does make more sense to me now and setting state within a component is so important At first I thought it did not matter that you could just move the state variable or the setter function at any point However knowing where to place state is crucial and can make life easier as you code especially as children components cannot pass props directly to a parent unless via a callback function More on components a bit later A brief explanation of useState before moving forward It can only be used within a functional component It also consists of a variable and a function that updates the variable and we can set the initial value depending on what we re working on If it s forms it will be an empty string if we re working with something like a toggle button we may use the boolean data type Again it all depends what you re trying to do so always proceed with caution and make sure what you re trying to do makes sense const state setState useState initialState I look back at an example from one of our labs where from the app component there are two branches that separate a header component and a container component that was used to render images onto what is rendering is not important right now Just keep in mind that in the hierarchy app is at the top the parent component and header and container branch down from app they are the children components of app From here the header also branched down to a search bar component now levels away from the main parent app From the lab example we had to render some images onto the container component which we do with a fetch request using theuseEffect fetch url here then then hook built into React Once you ve got that going one of the deliverables was to be able to filter search results Ideally you render your images within the container however you can also render them within app and from there move the data as a prop to the container You will have needed to use useState for fetching your image data and passing it over Already seeing the intricacies of this hook already Now remember the search bar component well that s basically on the other side of the hierarchy under header and if you recall children cannot pass props back to parents or from adjacent children components either Because there is going to be a change when a user types to search for something we need to create a state for the search Now where we create this state for search matters and can make life a bit more simple or cause us to do a bit more work I ll explain it the way I did it I set the state for search within app because from app you can send the initial state variable or the function to any child In this particular case we send the variable to the container component as a prop because in this component is where all our data is rendered and where we can filter the results However the function will update the change to the variable and so we send this to the search bar component via the header first because we must respect the hierarchy as a prop In the search bar component we have a form This form will change accordingly to whatever the user types so the function will change the initial state of the variable which has travelled to the opposite end of the hierarchy tree and will only display whatever is searched Rather long and complicated explanation from a novice The main take away from this is the importance of the useState hook and how it allows you to change the initial state of a component and its objective or what that component is meant to do in your overall application From my example the search bar and the container are two separate components under different branches They cannot communicate directly but do so indirectly via useState	2022-05-29 20:28:08
海外TECH	DEV Community	How to migrate from yarn / npm to pnpm	https://dev.to/andreychernykh/yarn-npm-to-pnpm-migration-guide-2n04	How to migrate from yarn npm to pnpm Motivationpnpm is more performant at fetching resolving and storing dependencies My personal experience shows that in some projects pnpm can be approx x time faster at resolving dependencies and up to x more efficient at disk usage It is also easy to migrate to from npm or yarn And the CLI is very similar to npm and yarn too Migration guideStep Install pnpm InstallationStep Delete node modulesnpx npkillStep Add to package json scripts preinstall npx only allow pnpm packageManager pnpm lt whatever pnpm version you re going to use gt Step Create pnpm workspace yamlpackages include packages in subdirs e g apps and components apps packages if required exclude some directories test Step Runpnpm importThis command will create a pnpm lock yaml file based on yarn lock or packages lock json Step Remove yarn lock or packages lock json Step Install dependenciespnpm iStep Replace npm run or yarn to pnpm in all package json and other files E g pnpm test instead of npm run test To run all commands across all workspaces in a monorepo use pnpm run pnpm e g pnpm r test Important You need to keep in mind that pnpm doesn t use dependency hoisting When installing dependencies with npm or Yarn Classic all packages are hoisted to the root of the modules directory As a result source code has access to dependencies that are not added as dependencies to the project By default pnpm uses symlinks to add only the direct dependencies of the project into the root of the modules directory pnpmIn practice it means that if you have a package A that imports a package B import something from B but doesn t explicitly specify B in the dependencies or devDependencies then the execution will fail CheatsheetTablesCommandsCoolInstall dependenciespnpm iAdd a dependencypnpm add lt package gt Shows all packages that depend on the specified packagepnpm why lt package gt Run a command as if it was executed form the root of the project rather than a workspace packagepnpm w lt command gt w workspace rootRestrict commands to specific subsets of packagespnpm filter lt package selector gt lt command gt This runs an arbitrary command from each package s scripts objectpnpm r lt command gt recursive r	2022-05-29 20:17:30
海外TECH	DEV Community	Explain "The Cloud" like I'm 5	https://dev.to/peter/explain-the-cloud-like-im-5-4ibm	unsplash	2022-05-29 20:01:25
ニュース	@日本経済新聞 電子版	ウクライナ「IT王国」陥落せず　踏みとどまるエンジニア https://t.co/FkQOYNs5el	https://twitter.com/nikkei/statuses/1531005619997908992	陥落	2022-05-29 20:12:39
ニュース	@日本経済新聞 電子版	メーカーがコンサルに変身　データを経営に生かす10選 https://t.co/Dy30ibASP1	https://twitter.com/nikkei/statuses/1531003881274376192	経営	2022-05-29 20:05:44
ニュース	@日本経済新聞 電子版	個人、円安でドル売りに動く　外貨預金・保険で解約加速 https://t.co/COot7m6PPo	https://twitter.com/nikkei/statuses/1531002861794250752	外貨預金	2022-05-29 20:01:41
ニュース	BBC News - Home	Jerusalem Flag March: Israeli nationalists stream through Muslim Quarter	https://www.bbc.co.uk/news/world-middle-east-61611304?at_medium=RSS&at_campaign=KARANGA	palestinian	2022-05-29 20:36:17
ニュース	BBC News - Home	French Open: Rafael Nadal wins to set up Novak Djokovic quarter-final in Paris	https://www.bbc.co.uk/sport/tennis/61619569?at_medium=RSS&at_campaign=KARANGA	French Open Rafael Nadal wins to set up Novak Djokovic quarter final in ParisRafael Nadal will play long time rival Novak Djokovic in the French Open quarter finals after winning an absorbing five set battle with Canada s Felix Auger Aliassime	2022-05-29 20:06:55
ビジネス	ダイヤモンド・オンライン - 新着記事	生前贈与による節税が“延命”した理由、政府がつぶしたい「本当のターゲット」とは - 生前贈与 節税チャンスは今のうち!?	https://diamond.jp/articles/-/303727	生前贈与	2022-05-30 05:25:00
ビジネス	ダイヤモンド・オンライン - 新着記事	【静岡】JA赤字危険度ランキング2022、17農協中8農協が赤字に - 全国510農協 JA赤字危険度ランキング	https://diamond.jp/articles/-/303535	単位農協	2022-05-30 05:20:00
ビジネス	ダイヤモンド・オンライン - 新着記事	「すごい中小農家」ランキング【ベスト20】1位は三井不動産から転身した山形県の“新星” - 儲かる農業 堕ちたJA	https://diamond.jp/articles/-/303474	三井不動産	2022-05-30 05:15:00
ビジネス	ダイヤモンド・オンライン - 新着記事	【岐阜】JA赤字危険度ランキング2022、7農協中ワースト1位の金融事業減益額は11億円 - 全国510農協 JA赤字危険度ランキング	https://diamond.jp/articles/-/303534		2022-05-30 05:10:00
ビジネス	ダイヤモンド・オンライン - 新着記事	中国のスマホ需要、急速に冷え込む　コロナ再拡大で - WSJ発	https://diamond.jp/articles/-/303986	需要	2022-05-30 05:06:00
ビジネス	ダイヤモンド・オンライン - 新着記事	外食の「勝ち残り戦略」が激変？ESG気運で台頭するエシカル消費の影響力 - 企業サバイバル最前線	https://diamond.jp/articles/-/303602	外食産業	2022-05-30 05:05:00
ビジネス	ダイヤモンド・オンライン - 新着記事	ウーバーとリフトを待ち受ける三重苦の難路 - WSJ発	https://diamond.jp/articles/-/303987	難路	2022-05-30 05:02:00
ビジネス	電通報 | 広告業界動向とマーケティングのコラム・ニュース	「ほほ笑みをとりもどす世界の広告 ―Good Ideas for GoodIII― 」展　アドミュージアム東京で6月4日から開催	https://dentsu-ho.com/articles/8197	goodideasforgoodiii	2022-05-30 06:00:00
ビジネス	東洋経済オンライン	企業分析のプロが教える｢決算書｣読み方のコツ 立教大学ビジネススクール･田中道昭教授に聞く | 最新の週刊東洋経済 | 東洋経済オンライン	https://toyokeizai.net/articles/-/592247?utm_source=rss&utm_medium=http&utm_campaign=link_back	東洋経済オンライン	2022-05-30 05:30:00