投稿時間:2023-08-06 12:10:24 RSSフィード2023-08-06 12:00 分まとめ(14件)

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IT	気になる、記になる…	【Kindle本セール】『講談社の「科学・テクノロジー関連本」セール 』など講談社の2つの新しいセールがスタート	https://taisy0.com/2023/08/06/174990.html	amazon	2023-08-06 02:23:21
IT	気になる、記になる…	｢Google Pixel Watch 2｣の一部仕様が明らかに ｰ 展示機用アニメーションも流出	https://taisy0.com/2023/08/06/174986.html	androidau	2023-08-06 02:10:03
python	Pythonタグが付けられた新着投稿 - Qiita	pandasの使い方 〜Python〜	https://qiita.com/wooooo/items/ccc3aad257170a2dd9db	pandas	2023-08-06 11:15:01
python	Pythonタグが付けられた新着投稿 - Qiita	#0012 pythonの予約語	https://qiita.com/kkkkodama10/items/97503e8f46d1551c808c	人工言語	2023-08-06 11:10:41
python	Pythonタグが付けられた新着投稿 - Qiita	ABC313回答メモ	https://qiita.com/Konini64/items/8bf6a94332cfc2fdfeb9	翌日	2023-08-06 11:03:44
js	JavaScriptタグが付けられた新着投稿 - Qiita	React　スプレッド構文をなぜ使うのか	https://qiita.com/ooyy0121/items/68c5ba32ffc8d01c478e	javascr	2023-08-06 11:38:26
Ruby	Rubyタグが付けられた新着投稿 - Qiita	Rustの関数をRubyやCrystalから呼び出す：方法と課題 - 1日目	https://qiita.com/kojix2/items/302169c326bf3ce69130	crystal	2023-08-06 11:46:14
AWS	AWSタグが付けられた新着投稿 - Qiita	テンプレ容量(51,200 バイト)を超えた「cloudformation deploy」実行方法について	https://qiita.com/kaburagi_/items/3ec34d95b6c15c294c2b	cloudformation	2023-08-06 11:16:21
Git	Gitタグが付けられた新着投稿 - Qiita	GitのHEADについて少し理解が深まったのでメモ	https://qiita.com/kaminanoaniki/items/509fed31415ac2ddb5eb	記録	2023-08-06 11:25:31
海外TECH	DEV Community	Underrated React Hook - useSyncExternalStore	https://dev.to/brainiacneit/underrated-react-hook-usesyncexternalstore-h8h	Underrated React Hook useSyncExternalStore OverviewDiscover a hidden powerhouse in the React ecosystem the useSyncExternalStore hook This article delves into its transformative potential challenging traditional state management paradigms By seamlessly integrating external data sources and enhancing cross component communication this hook offers an unconventional yet powerful approach Journey with us as we demystify useSyncExternalStore We ll dissect its mechanics unveil its benefits and showcase practical applications through real world examples By the end you ll grasp how to wield this hook to streamline complexity boost performance and bring a new level of organization to your codebase UsageAccording to React useSyncExternalStore is a React Hook that lets you subscribe to an external store But what is an external store exactly It literally takes functions The subscribe function should subscribe to the store and return a function that unsubscribes The getSnapshot function should read a snapshot of the data from the store Okay it s might be hard to get at first We can go into the example The DemoFor our demo today I will go into a classic application The Todo List The StoreFirst we have to define the initial state export type Task id string content string isDone boolean export type InitialState todos Task export const initialState InitialState todos You can see that I defined the types and then created the state that has todos as an empty arrayNow is the reducer export function reducer state InitialState action any switch action type case ADD TASK const task content action payload id uid isDone false return state todos state todos task case REMOVE TASK return state todos state todos filter task gt task id action payload case COMPLETE TASK const tasks state todos map task gt if task id action payload task isDone task isDone return task return state todos tasks default return state Our reducer only has actions ADD TASK REMOVE TASK and COMPLETE TASK This is the classic example of a to do list logic Finally what we are waiting for the store let listeners any function createStore reducer any initialState InitialState let state initialState function getState return state function dispatch action any state reducer state action emitChange function subscribe listener any listeners listeners listener return gt listeners listeners filter l gt l listener const store dispatch getState subscribe return store function emitChange for let listener of listeners listener export const store createStore reducer initialState This code snippet illustrates the creation of a simple Redux like state management system in TypeScript Here s a breakdown of how it works listeners Array This array holds a list of listener functions that will be notified whenever the state changes createStore Function This function is responsible for creating a Redux style store It takes two parameters reducer A reducer function responsible for calculating the next state based on the current state and dispatched action initialState The initial state of the application state This variable holds the current state of the application getState Function Returns the current state dispatch Function Accepts an action object passes it to the reducer along with the current state updates the state with the result and then calls the emitChange function to notify listeners about the state change subscribe Function Accepts a listener function adds it to the listeners array and returns a cleanup function that can be called to remove the listener store Object The created store object holds references to the dispatch getState and subscribe functions emitChange Function Iterates through the listeners array and invokes each listener function notifying them of a state change At the end of the code a store is created using the createStore function with a given reducer and initial state This store can now be imported and used in other parts of the application to manage and control the state It s important to note that this code provides a simplified implementation of a state management system and lacks some advanced features and optimizations found in libraries like Redux However it serves as a great starting point to understand the basic concepts of state management using listeners and a reducer function To use the useSyncExternalStore hook We can get the state like this const todos useSyncExternalStore store subscribe store getState With this hook call we can access the store globally and dynamically while maintain the readability and maintainability Pros and ConsThe useSyncExternalStore hook presents both advantages and potential drawbacks in the context of state management within a React application Pros Seamless Integration with External Sources The hook enables effortless integration with external data sources promoting a unified approach to state management This integration can simplify the handling of data from various origins enhancing the application s cohesion Cross Component Communication useSyncExternalStore facilitates efficient communication between components streamlining the sharing of data and reducing the need for complex prop drilling or context management Performance Improvements By centralizing state management and minimizing the propagation of state updates this hook has the potential to optimize rendering performance resulting in a more responsive and efficient application Simplicity and Clean Code The hook s abstracted API can lead to cleaner and more organized code making it easier to understand and maintain particularly in large scale applications Reduced Boilerplate useSyncExternalStore may reduce the need for writing redundant code for state management providing a concise and consistent way to manage application wide state Cons Learning Curve Developers unfamiliar with this hook might experience a learning curve when transitioning from more established state management solutions Adapting to a new approach could initially slow down development Customization Limitations The hook s predefined functionalities might not align perfectly with every application s unique requirements Customizing behavior beyond the hook s capabilities might necessitate additional workarounds Potential Abstraction Overhead Depending on its internal mechanics the hook might introduce a slight overhead in performance or memory usage compared to more optimized solutions tailored specifically for the application s needs Community and Ecosystem As an underrated or lesser known hook useSyncExternalStore might lack a well established community and comprehensive ecosystem potentially resulting in fewer available resources or third party libraries Compatibility and Future Updates Compatibility with future versions of React and potential updates to the hook itself could be points of concern Ensuring long term support and seamless upgrades may require extra diligence ConclusionIn summary useSyncExternalStore offers a unique approach to state management emphasizing seamless integration and cross component communication While it provides several benefits such as improved performance and simplified code developers should carefully evaluate its compatibility with their project s requirements and consider the potential learning curve and limitations Source Code	2023-08-06 02:56:14
海外TECH	ReadWriteWeb	Best Personal Safe Box for 2023	https://readwrite.com/best-personal-safe-box/	Best Personal Safe Box for Many companies featured on ReadWrite partner with us Opinions are our own but compensation and in depth research determine how products The post Best Personal Safe Box for appeared first on ReadWrite	2023-08-06 02:00:30
金融	ニュース - 保険市場TIMES	三井住友海上、「地域住民のためのコンサート」開催地を募集中	https://www.hokende.com/news/blog/entry/2023/08/06/120000	三井住友海上、「地域住民のためのコンサート」開催地を募集中上質なクラシックコンサートを開催三井住友海上火災保険株式会社以下、三井住友海上は年月日まで、三井住友海上文化財団による、年度「地域住民のためのコンサート」開催地を募集している。	2023-08-06 12:00:00
ニュース	BBC News - Home	Kai Cenat: Police charge Twitch streamer after PS5 giveaway mayhem	https://www.bbc.co.uk/news/world-us-canada-66416366?at_medium=RSS&at_campaign=KARANGA	manhattan	2023-08-06 02:43:03
ビジネス	東洋経済オンライン	｢バービー炎上｣で気になるアメリカの原爆教育 ｢原爆投下は必要だった｣という議論に変化も | アメリカ | 東洋経済オンライン	https://toyokeizai.net/articles/-/692624?utm_source=rss&utm_medium=http&utm_campaign=link_back	原爆投下	2023-08-06 11:30:00