投稿時間:2023-08-27 01:11:04 RSSフィード2023-08-27 01:00 分まとめ(13件)

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Ruby	Railsタグが付けられた新着投稿 - Qiita	DeviseTokenAuthでCookieを使用する方法【Rails】	https://qiita.com/P-man_Brown/items/d6dadf548e68667640ac	cookieattri	2023-08-27 00:00:23
海外TECH	MakeUseOf	Navidrome Is the Perfect Self-Hosted Music Server for Raspberry Pi	https://www.makeuseof.com/raspberry-pi-navidrome-self-hosted-music-server/	music	2023-08-26 15:46:22
海外TECH	MakeUseOf	How to Outline Images, Text, and Shapes in Canva	https://www.makeuseof.com/canva-how-to-outline-images-text-shapes/	canva	2023-08-26 15:31:25
海外TECH	MakeUseOf	How to Install Themes in Obsidian	https://www.makeuseof.com/how-to-install-themes-obsidian/	install	2023-08-26 15:31:25
海外TECH	MakeUseOf	How to Fix the Minecraft Launcher Error 0x803f8001 in Windows 11 and 10	https://www.makeuseof.com/windows-11-10-minecraft-0x803f8001-error-fix/	windows	2023-08-26 15:15:25
海外TECH	MakeUseOf	What Are Overlay Attacks? How Do You Protect Against Them?	https://www.makeuseof.com/overlay-attacks/	information	2023-08-26 15:00:26
海外TECH	DEV Community	JavaScript's async function and topological ordering	https://dev.to/artxe2/javascripts-async-function-and-topological-ordering-51f8	JavaScript x s async function and topological orderingToday we all use web browsers And this is like saying that we all use JavaScript There are many reasons behind this but one of the main reasons may be that JavaScript supports powerful asynchronous functions However crafting intricate asynchronous logic tends to be notably more challenging than devising procedural logic How can write asynchronous logic more easily JavaScript is a single threaded language This is an important issue A single thread means that everything is done synchronously Let s look at the example below const log consoleasync function a log b log async function b log log log a log What would be the output result of the above code It s By default the async keyword does not affect the execution order Now let s look at the second example const log consoleasync function a log await b log async function b Promise resolve then gt log then gt log log a log Similarly the code above also prints To understand this you need to know about the Microtask queue log is enqueued in the queue as soon as Promise resolve is completed inside the function b After that function b exits and due to the await log is enqueued in the queue Finally when function a finishes and log is executed after the initially queued log is executed log is enqueued in the queue What happens if you add await before Promise resolve here const log consoleasync function a log await b log async function b await Promise resolve then gt log then gt log log a log The example above is mostly similar to the second example but log is enqueued in the queue after log is completed As a result the code above also prints The examples above are all logic executed within JavaScript and therefore all operations are carried out synchronously External APIs for JavaScriptThen what are the cases in which operations are performed asynchronously in JavaScript In today s JavaScript runtime environments such as web browsers and Node js several external APIs enable asynchronous operations using multithreading Some of these include familiar features like setTimeout fetch and HTMLElement addEventListener The following example uses setTimeout const log consoleasync function a log await b queueMicrotask gt log async function b new Promise resolve gt setTimeout gt resolve log then gt log log a log Indeed it s a code that prints Just to clarify queueMicrotask is a function that directly schedules a callback in the microtask queue Then why is log executed later than log That s because JavaScript s external APIs rely on a feature called the Event loop The event loop operates as a separate queue from the microtask queue and when all microtask is complete the next event callback is executed Due to this structure even though log is enqueued in the event callback queue before queueMicrotask or log it is executed after log in the microtask queue has been executed Promise Chaining and DAGSure now let s go back to the original question How can write asynchronous logic more easily The answer is to construct complex asynchronous logic into DAGs DAG stands for directed acyclic graph Let s consider a scenario where we use a user ID to retrieve user information and a list of posts Subsequently for each post we fetch the corresponding comments Once all these tasks are completed we need to display the gathered information on the view Representing this procedure as a graph would look like the followingAnd this could be implemented as followsasync function get user info user id async function get user posts user id async function get post comments post id function render contents async function get contents user id const user info promise get user info user id const user posts promise get user posts user id const posts comments promise user posts promise then posts gt Promise all posts map post gt get post comments post post id const user info await user info promise const user posts await user posts promise const posts comments await posts comments promise return user posts map post i gt post user name user info user name post comments posts comments i return post const contents await get contents render contents By appropriately utilizing Promise all and lazy await scenarios like this DAG can be easily resolved in a topological order However if the composition of the DAG becomes more complex solving the problem using this approach alone can become cumbersome Async Lube Simplify Asynchronous Operations in JavaScriptAsync Lube is a simple library that makes it easy to create complex asynchronous operations Using async lube the example above could be written as followsimport dag from async lube omit async function get contents user id const get posts comments posts gt Promise all posts map post gt get post comments post post id const merge contents dag add user info promise user id add get user posts user id add get posts comments get user posts add user info user posts posts comments gt user posts map post i gt post user name user info user name post comments posts comments i return post user info promise get user posts get posts comments return merge contents const contents await get contents render contents The dag add function takes a callback and dependencies as arguments and dag executes the callbacks in the order of topological sorting By using this approach the complexity of even intricate asynchronous logic can be constrained to increase linearly with the amount of code If you d like to see code that uses the functioning async lube an example is shown below	2023-08-26 15:24:53
Apple	AppleInsider - Frontpage News	How to disable animated cover art in Apple Music	https://appleinsider.com/inside/apple-music/tips/how-to-disable-animated-cover-art-in-apple-music?utm_medium=rss	How to disable animated cover art in Apple MusicVideo is widely considered the natural next step for album cover artwork but some listeners find it gimmicky or prefer a static image This is how to disable animated cover art in Apple Music If Apple Music is at the centre of your listening experience you may want to customize it to your liking Albums distributed on physical media always had strong cover artwork to accompany the music but this was always a static image Now that online music on electronic devices makes up the vast majority of listenership artists and platforms are leverage the technology to include videos and animations in album artwork Read more	2023-08-26 15:49:34
ニュース	BBC News - Home	British Museum recovers some of 2,000 stolen items	https://www.bbc.co.uk/news/entertainment-arts-66626619?at_medium=RSS&at_campaign=KARANGA	british	2023-08-26 15:43:29
ニュース	BBC News - Home	Loch Ness Monster: Hundreds join huge search for Nessie	https://www.bbc.co.uk/news/uk-scotland-highlands-islands-66614935?at_medium=RSS&at_campaign=KARANGA	nessie	2023-08-26 15:20:33
ニュース	BBC News - Home	Luis Rubiales: Spain coaching staff resign over Hermoso kiss row	https://www.bbc.co.uk/sport/football/66629505?at_medium=RSS&at_campaign=KARANGA	Luis Rubiales Spain coaching staff resign over Hermoso kiss rowSpain s entire coaching staff from their Women s World Cup win except for head coach Jorge Vilda have resigned over the Luis Rubiales row	2023-08-26 15:47:57
ニュース	BBC News - Home	Dutch Grand Prix: Max Verstappen beats Lando Norris to pole in crash-strewn session	https://www.bbc.co.uk/sport/formula1/66628609?at_medium=RSS&at_campaign=KARANGA	Dutch Grand Prix Max Verstappen beats Lando Norris to pole in crash strewn sessionRed Bull s Max Verstappen beats McLaren s Lando Norris to pole position in a crash strewn qualifying session at the Dutch Grand Prix	2023-08-26 15:34:24
海外TECH	reddit	[SPOILER] Max Holloway vs. Chan Sung Jung	https://www.reddit.com/r/MMA/comments/161xvo2/spoiler_max_holloway_vs_chan_sung_jung/	SPOILER Max Holloway vs Chan Sung Jung submitted by u notwayinoo to r MMA link comments	2023-08-26 15:15:55