投稿時間:2023-03-04 21:18:17 RSSフィード2023-03-04 21:00 分まとめ(23件)

カテゴリー等	サイト名等	記事タイトル・トレンドワード等	リンクURL	頻出ワード・要約等/検索ボリューム	登録日
IT	気になる、記になる…	Anker、｢楽天スーパーSALE｣で100製品以上を最大40％オフで販売中	https://taisy0.com/2023/03/04/169243.html	anker	2023-03-04 11:08:23
IT	気になる、記になる…	楽天モバイル、｢楽天スーパーSALE｣でiPhone 12/13/14/SEを最大30％オフで販売中	https://taisy0.com/2023/03/04/169237.html	iphone	2023-03-04 11:00:13
IT	気になる、記になる…	CIO、｢楽天スーパーSALE｣で対象製品を最大74％オフで販売中 ｰ 開始4時間まで利用可能な10%オフクーポンも配布中	https://taisy0.com/2023/03/04/169234.html	対象製品	2023-03-04 11:00:10
IT	気になる、記になる…	トリニティ、｢楽天スーパーSALE｣で対象製品を最大40％オフで販売中 ｰ 明日午前1時まで全品20％オフクーポンも配布中	https://taisy0.com/2023/03/04/169231.html	対象製品	2023-03-04 11:00:07
python	Pythonタグが付けられた新着投稿 - Qiita	「Pythonではじめるアルゴリズム入門」#03 - ソートアルゴリズム	https://qiita.com/K_Nemoto/items/931542547cd2c6e04c07	記録	2023-03-04 20:21:51
Azure	Azureタグが付けられた新着投稿 - Qiita	[Azure] Service Busを介してLINEからのメッセージを処理する。	https://qiita.com/syantien/items/71fe715519c6b1734e54	azureservicebus	2023-03-04 20:17:40
Ruby	Railsタグが付けられた新着投稿 - Qiita	【3分でできる】Railsでbootstrapの導入方法	https://qiita.com/ooyama-tetu/items/a8d29f6ba3c43a692e27	boots	2023-03-04 20:52:54
技術ブログ	Developers.IO	【技術書の読書術 実践してみた】3の発想で3冊の本を読んでみた	https://dev.classmethod.jp/articles/tecbook_reading_3idea/	読書	2023-03-04 11:39:40
海外TECH	Ars Technica	Do masks work? It’s a question of physics, biology, and behavior	https://arstechnica.com/?p=1921845	prominent	2023-03-04 11:15:40
海外TECH	DEV Community	How to return multiple items in a map function in JavaScript	https://dev.to/david_bilsonn/how-to-return-multiple-items-in-a-map-function-in-javascript-eip	How to return multiple items in a map function in JavaScriptThe map function enables you to loop over every element in an array modify it and then return a different element to replace the initial element The map function does not change the original array you will still have the same amount of elements as the original array The map method takes a function that accepts three arguments The first argument is the current valueSecond argument is the indexThe third argument is the original arrayLet s take a deeper look into this with an example Create an array let val Using the map function iterate through every element in the array let newVal val map v gt return v v v v v v log newVal into consoleconsole log newVal The map function will return a new array in the console Let us go through an array of programming languages let languages Kotlin Java Rust React Node Python Now we need to create a map function inside this function we need to have a return statement and whatever we return will become the content of the new array let languages Kotlin Java Rust React Node Python log the variable to console to see the languages arrayconsole log languages now let s make use of the map functionlet langLength languages map function item index array return log langLength to consoleconsole log langLength You will observe that the new array now has six s in it Let us put an index in the array and see what it returns let langLength languages map function item index array return index log langLength to consoleconsole log langLength You will see in your console that it outputs the index number of each array Now pass in the third argument of the function to the return statement let langLength languages map function item index array return array log langLength to console to see the outputconsole log langLength You can see in the console that each item in the array has now been listed A better approach to returning multiple items from an array is by using the flatMap function const num const newNum num flatMap v gt v v v v v v console log JSON stringify newNum You should have a result like this The map function in JavaScript returns a new array with the same number of elements as the original array If you want to create a new array with a different number of elements you may need to use a different function such as filter reduce or flatMap The flatMap function is available as a built in function on arrays in JavaScript It works similarly to the map function but it also flattens the output into a single array This means that if the function applied by flatMap returns an array the elements of that array are included in the final output array I hope you have found this article helpful Please take a moment to share your feedback in the CS Thank you for reading	2023-03-04 11:18:40
海外TECH	DEV Community	Rails Service Objects: A Tiny Guide	https://dev.to/daviducolo/rails-service-objects-a-tiny-guide-11d2	Rails Service Objects A Tiny GuideService objects are an important concept in the Ruby on Rails framework and they are a crucial component of the Model View Controller MVC architecture Service objects are classes that encapsulate business logic and they are responsible for performing a specific set of tasks within a Rails application They can be used to perform tasks such as interacting with APIs performing calculations and performing database operations The concept of a service object is not unique to Ruby on Rails but it has become increasingly popular in recent years due to the growing complexity of web applications In this article we will explore the concept of service objects in Rails and how they can be used to improve the structure and organization of Rails applications What is a Service Object A service object is a Ruby class that encapsulates a specific set of functionality within a Rails application It is responsible for performing a single well defined task that is often not directly related to any specific model or controller within the application Service objects are designed to be reusable and modular which makes them easy to test and maintain The primary purpose of a service object is to isolate and encapsulate business logic that does not fit neatly into a model or controller This could be a calculation that involves multiple models or a task that involves external APIs or services By isolating this functionality in a service object you can improve the overall structure and organization of your application and make it easier to maintain and test Service objects can be used in a variety of contexts within a Rails application For example you might use a service object to process payments send emails or interact with an external API In each case the service object would encapsulate the necessary functionality and provide a clean well defined interface for other parts of the application to use Implementing Service Objects in RailsImplementing a service object in Rails is relatively straightforward You can create a new class in the app services directory and then define the necessary methods and functionality within that class Here is an example of a simple service object that calculates the total price of a shopping cart class CalculateTotalPrice def initialize cart cart cart end def call cart items sum amp price endendIn this example the CalculateTotalPrice class takes a shopping cart as an argument and calculates the total price of all items in the cart The call method is the entry point for the service object and it returns the calculated total price To use this service object within a controller you would simply create a new instance of the CalculateTotalPrice class and call the call method class CartsController lt ApplicationController def show cart Cart find params id total price CalculateTotalPrice new cart call endendn this example the show method of the CartsController creates a new instance of the CalculateTotalPrice class and passes the shopping cart as an argument The call method is then called and the calculated total price is assigned to the total price variable Benefits of Using Service ObjectsThere are several benefits to using service objects within a Rails application One of the primary benefits is improved organization and structure By isolating business logic in service objects you can make your code more modular and easier to maintain Service objects can also help to reduce the complexity of models and controllers which can make it easier to understand and reason about the application as a whole Another benefit of using service objects is improved testability Because service objects encapsulate well defined functionality they can be tested in isolation using a variety of testing frameworks This can help to further demonstrate how service objects can improve testability in Rails applications let s consider a more complex example Imagine you have an e commerce application that includes a feature for calculating shipping costs The shipping cost calculation involves multiple factors including the weight of the items the destination address and the shipping method selected by the user To implement this functionality in a Rails application you might start by adding a method to the Cart model to calculate the shipping cost class Cart lt ApplicationRecord def shipping cost destination address shipping method calculate shipping cost based on destination address and shipping method endendThis approach works but it has a few drawbacks First the logic for calculating shipping costs is mixed in with the Cart model which can make it harder to understand and maintain Second it can be difficult to test the shipping cost calculation in isolation since it is tightly coupled to the Cart model To address these issues you could refactor the shipping cost calculation into a service object Here s an example implementation class CalculateShippingCost def initialize cart destination address shipping method cart cart destination address destination address shipping method shipping method end def call calculate shipping cost based on cart destination address and shipping method endendIn this implementation the CalculateShippingCost service object takes the Cart object the destination address and the shipping method as arguments The call method performs the shipping cost calculation Now in your controller you can use the service object like this class OrdersController lt ApplicationController def create cart Cart find params cart id shipping cost CalculateShippingCost new cart params destination address params shipping method call create order and process payment endendBy using a service object you ve improved the organization and testability of your code You can easily test the shipping cost calculation in isolation using a testing framework like RSpec or MiniTest This makes it easier to catch bugs and make changes to the shipping cost calculation in the future ConclusionService objects are a powerful tool for improving the structure organisation and testability of Rails applications By encapsulating business logic in service objects you can make your code more modular and easier to maintain Service objects also make it easier to test complex functionality in isolation which can help you find bugs and make changes with confidence When implementing service objects in your Rails application remember to focus them on a single task and use a descriptive name that accurately reflects their purpose This will make your code easier to read and understand and will help ensure that your service objects remain modular and reusable	2023-03-04 11:08:03
ニュース	@日本経済新聞 電子版	食も薬も売るドラッグ店「コスモス」躍進　大型店新設 https://t.co/nOnpVmNEoI https://t.co/Gr8Kucik3R	https://twitter.com/nikkei/statuses/1631987893018284033	躍進	2023-03-04 12:00:09
ニュース	@日本経済新聞 電子版	過疎地の人口、6県で大正時代並みに　移住や副業急ぐ https://t.co/bFMCZ4WKxL	https://twitter.com/nikkei/statuses/1631987328821649411	大正時代	2023-03-04 11:57:54
ニュース	@日本経済新聞 電子版	60歳の今もドライバーで270ヤード https://t.co/ZOj0UNxSpu 脱サラゴルファーの清水洋一選手はシニアツアー10年連続シードなど息長く活躍。飛距離を維持するコツは道具と構えにあるといいます。 https://t.co/8sTXACtIPZ	https://twitter.com/nikkei/statuses/1631984101946187777	歳の今もドライバーでヤード脱サラゴルファーの清水洋一選手はシニアツアー年連続シードなど息長く活躍。	2023-03-04 11:45:05
ニュース	@日本経済新聞 電子版	［社説］新しい宇宙飛行士像を築け https://t.co/b6aJrQHp9z	https://twitter.com/nikkei/statuses/1631983810740125698	宇宙飛行士	2023-03-04 11:43:55
ニュース	@日本経済新聞 電子版	減らぬ電力難民なお4万件　新電力に流れた「罰」か https://t.co/gubQ6dGQmu	https://twitter.com/nikkei/statuses/1631980362183200770	電力	2023-03-04 11:30:13
ニュース	@日本経済新聞 電子版	黒海ルートの穀物輸出に暗雲　ロシアが合意延長に難色 https://t.co/OVoMw5uCWo	https://twitter.com/nikkei/statuses/1631977283916537857	黒海	2023-03-04 11:17:59
ニュース	@日本経済新聞 電子版	自衛隊、緊急発進に無人機活用　年内にも運用実験 https://t.co/XQQIt9cop8	https://twitter.com/nikkei/statuses/1631974770840576003	緊急発進	2023-03-04 11:08:00
海外ニュース	Japan Times latest articles	Japan and South Korea eye package to resolve wartime labor row and other issues	https://www.japantimes.co.jp/news/2023/03/04/national/politics-diplomacy/south-korea-japan-package-agreement/	korean	2023-03-04 20:02:59
ニュース	BBC News - Home	Street fighting in Bakhmut but Russia not in control - deputy mayor	https://www.bbc.co.uk/news/world-europe-64846666?at_medium=RSS&at_campaign=KARANGA	strategic	2023-03-04 11:04:05
ニュース	BBC News - Home	Matt Hancock's reaction to photo of kiss with aide revealed in text leak	https://www.bbc.co.uk/news/uk-politics-64844081?at_medium=RSS&at_campaign=KARANGA	health	2023-03-04 11:46:29
ニュース	BBC News - Home	Australia's 'biggest drug bust' nets $700m of cocaine	https://www.bbc.co.uk/news/world-australia-64847242?at_medium=RSS&at_campaign=KARANGA	america	2023-03-04 11:39:11
ニュース	BBC News - Home	Channel ferry blaze: Isle of Innisfree towed to Calais	https://www.bbc.co.uk/news/uk-england-kent-64847029?at_medium=RSS&at_campaign=KARANGA	engine	2023-03-04 11:10:44