投稿時間:2022-05-02 09:16:17 RSSフィード2022-05-02 09:00 分まとめ(18件)

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IT	ITmedia 総合記事一覧	[ITmedia PC USER] 「Let's note」の法人向け新シリーズ「FV3」が発売に	https://www.itmedia.co.jp/pcuser/articles/2205/02/news048.html	itmediapcuser	2022-05-02 08:45:00
python	Pythonタグが付けられた新着投稿 - Qiita	Pythonで画像に線や文字を描画	https://qiita.com/john-rocky/items/ca83db7bd60bf2fe1e2f	imreadbirdjpgimgcvlineimg	2022-05-02 08:44:37
技術ブログ	Developers.IO	Azure Resource Graphでリソース変更履歴をクエリ出来るようになってました	https://dev.classmethod.jp/articles/azure-resource-graph-resource-changes-query/	azure	2022-05-01 23:58:41
海外TECH	DEV Community	Design Patterns in Typescript	https://dev.to/triyanox/design-patterns-in-typescript-e68	Design Patterns in TypescriptHello guys and welcome to a new blog post about Design Patterns in TypeScript Design Patterns First what are design patterns Design Patterns are a set of best practices that are used to solve common problems in software development and to make it easier to understand and maintain code There are several design patterns such as Singleton Factory Observer Command Strategy Template Method Builder Decorator Adapter Facade Proxy and many more and I will cover the most important ones in this blog post and as you ve read before design patterns are a powerful tool to help you to write better code and slove problems faster and easier SingletonThe Singleton pattern is a design pattern that restricts the instantiation of a class to one object and it s used to ensure that only one object of a class is created Implementing the Singleton pattern in Typescript is very easy and you can use the singleton module class Singleton private static instance Singleton private constructor public static getInstance Singleton if Singleton instance Singleton instance new Singleton return Singleton instance and you can use it like this const singleton Singleton getInstance FactoryThe Factory pattern is a design pattern that lets you create objects without specifying the exact class of the object that will be created In this example we want to make car depending on it s type so instad of making a class for each type we make a single factory class to make us a car depending on the type we give it class VehicleFactory public createVehicle type string Vehicle switch type case car return new Car case truck return new Truck default throw new Error Vehicle of type type not found and then you can use it like this const factory new VehicleFactory const car factory createVehicle car const truck factory createVehicle truck ObserverThe Observer pattern is a design pattern that lets you define a subscription mechanism to notify multiple objects and it s used in mainly in the event driven programming paradigm Implementing the Observer pattern in Typescript is very easy and you can use the observer module class Subject private observers Observer public subscribe observer Observer this observers push observer public unsubscribe observer Observer const index this observers indexOf observer this observers splice index public notify data any this observers forEach observer gt observer update data then you can use it like this class Observer public update data any console log data and then you can let the subject know that there is a new data available const subject new Subject const observer new Observer subject subscribe observer subject notify Hello World and you can also unsubscribe the observer from the subject subject unsubscribe observer CommandThe Command pattern is a design pattern that lets you encapsulate all information needed to perform an action in one object Implementing the Command pattern in Typescript is very easy and you can use the command module class Command constructor private receiver Receiver public execute this receiver action then you can use the command module to create a command object and pass it to the invoker const receiver new Receiver const command new Command receiver const invoker new Invoker invoker setCommand command invoker execute StrategyThe Strategy pattern is a design pattern that lets you define a family of algorithms encapsulate each one and make them interchangeable Implementing the Strategy pattern in Typescript is very easy and you can use the strategy module class Strategy public LastElement data return data data length and then you can use it like this const strategy new Strategy const data let last strategy LastElement data Template MethodThe Template Method pattern is a design pattern that lets you define the skeleton of an algorithm in an operation deferring some steps to subclasses For example you want to make a pizza and you want to make it with tomato sauce cheese and ham but you don t want to repeat the same steps for every pizza you makeso instad you can define the steps in a template method and then you can use it to make different pizzas The Implementation will be like thisclass Pizza public makePizza this prepareDough this addSauce this addToppings this bake public prepareDough console log Preparing dough public addSauce console log Adding sauce public addToppings console log Adding toppings cheese ham mushrooms public bake console log Bake for minutes at BuilderThe Builder pattern is a design pattern that lets you construct complex objects step by step and it s used in mainly in the object oriented programming paradigm And you can implement the Builder pattern in Typescript is very easy and you can use the builder module class Builder public build return new Product Then you make a product class class Product constructor private partA string private partB string Then you make a director class to build the product class Director public build builder Builder builder buildPartA builder buildPartB Then you make a ConcreteBuilder that implements the Builder interface class ConcreteBuilder extends Builder private product Product public buildPartA this product partA Part A public buildPartB this product partB Part B public getProduct const product this product this reset return product public reset this product new Product const builder new ConcreteBuilder const director new Director director build builder make a new productconst product new Product Part A Part B get the productconst newProduct builder getProduct DecoratorThe Decorator pattern is a design pattern that lets you dynamically change the behavior of an object at run timeand it s communly used in frameworks like Angular And you can implement the Decorator pattern in Typescript is very easy and you can use the decorator module Again imagine you want to make a pizza and you want to make it with tomato sauce cheese and ham but you don t want to repeat the same steps for every pizza you makeFirst you need to make a pizza class class Pizza public makePizza console log Making a pizza Then you make a decorator class that will decorate the pizza class class PizzaDecorator extends Pizza constructor public pizza Pizza super public makePizza this pizza makePizza Then you make a concrete decorator class that extends the decorator class to add the cheese class CheeseDecorator extends PizzaDecorator constructor pizza Pizza super pizza public makePizza super makePizza console log Adding cheese Then you make a concrete decorator class that extends the decorator class to add the ham class HamDecorator extends PizzaDecorator constructor pizza Pizza super pizza public makePizza super makePizza console log Adding ham Then you make a concrete decorator class that extends the decorator class to add the mushrooms class MushroomDecorator extends PizzaDecorator constructor pizza Pizza super pizza public makePizza super makePizza console log Adding mushrooms Then you make your pizza const pizza new CheeseDecorator new HamDecorator new MushroomDecorator new Pizza pizza makePizza as you can see the decorator pattern uses nested classes and inheritance to add new functionality to an object AdapterThe Adapter design pattern is a design pattern that lets you convert the interface of a class into another interface that it expects imagine you want to turn a socket into a plug class Socket constructor private type string public getType return this type Then you make a plug class class Plug constructor private type string public getType return this type Then you make an adapter class that will adapt the socket class to the plug class class SocketAdapter implements Plug constructor private socket Socket public getType return this socket getType Then you make your plug const plug new SocketAdapter new Socket Type C console log plug getType As you can see the adapter class uses inheritance to adapt the socket class to the plug class FacadeThe Facade pattern is a design pattern that lets you define a simple unified interface to a large body of code imagine you want to make a car and you want to make it with a engine transmission and wheels First you need to make a car class class Car public makeCar console log Making a car Then you make a facade class that will make the car with an engine transmission and wheels class CarFacade constructor private car Car public makeCar this car makeCar this makeEngine this makeTransmission this makeWheels private makeEngine console log Making engine private makeTransmission console log Making transmission private makeWheels console log Making wheels Then you make your car const car new CarFacade new Car car makeCar ProxyThe Proxy design pattern is a design pattern that lets you provide a surrogate or placeholder object for another object to control access to it For example imagine you want to give students access to a library but you don t want them to be able to access the library directly First you need to make a library class class Library public getBooks console log Getting books Then you make a proxy class that will give students access to the library class LibraryProxy constructor private library Library public getBooks this library getBooks Then you make your library const library new LibraryProxy new Library library getBooks ConclusionYou don t need to know design patterns to make software but you can get lot of benifits from them like writing clean and maintanable code and overcome problems faster better and more efficiently That was it for this blog post about design patterns hope you enjoy it	2022-05-01 23:41:51
海外ニュース	Japan Times latest articles	Hope fizzles out for Japan’s ‘revenge spending’ splurge as inflation looms	https://www.japantimes.co.jp/news/2022/05/02/business/economy-business/japan-inflation-spending/	Hope fizzles out for Japan s revenge spending splurge as inflation loomsFacing the prospect of struggling with rising prices Japan s famously thrifty consumers are tightening their belts even as they sit on the remains of an	2022-05-02 08:26:38
ニュース	BBC News - Home	Mariupol civilians taken to both sides' territory	https://www.bbc.co.uk/news/world-europe-61292951?at_medium=RSS&at_campaign=KARANGA	russia	2022-05-01 23:29:13
ニュース	BBC News - Home	Ukraine war: Evacuation of Mariupol civilians under way	https://www.bbc.co.uk/news/world-europe-61294744?at_medium=RSS&at_campaign=KARANGA	plant	2022-05-01 23:17:56
ニュース	BBC News - Home	Cancer checks: Record number of patients referred in England	https://www.bbc.co.uk/news/health-61293980?at_medium=RSS&at_campaign=KARANGA	england	2022-05-01 23:11:00
ニュース	BBC News - Home	Free-range eggs return as hens are allowed back outside	https://www.bbc.co.uk/news/business-61275750?at_medium=RSS&at_campaign=KARANGA	outbreak	2022-05-01 23:00:52
ニュース	BBC News - Home	'The Down Syndrome Act means so much to me'	https://www.bbc.co.uk/news/uk-england-london-61277596?at_medium=RSS&at_campaign=KARANGA	syndrome	2022-05-01 23:01:12
ニュース	BBC News - Home	General Belgrano: The opera singer who survived the sinking of the Argentine cruiser	https://www.bbc.co.uk/news/stories-61272009?at_medium=RSS&at_campaign=KARANGA	General Belgrano The opera singer who survived the sinking of the Argentine cruiserIn May the Argentine cruiser the General Belgrano was sunk by British torpedoes during the war over the Falkland or Malvinas Islands	2022-05-01 23:01:02
ニュース	BBC News - Home	Shanghai lockdown: The hard life of a homeless deliveryman	https://www.bbc.co.uk/news/world-asia-china-61270253?at_medium=RSS&at_campaign=KARANGA	deliverymanmany	2022-05-01 23:49:21
ニュース	BBC News - Home	Unravelling Australia's complex jobs puzzle	https://www.bbc.co.uk/news/business-60835196?at_medium=RSS&at_campaign=KARANGA	career	2022-05-01 23:02:48
ニュース	BBC News - Home	Andy Murray 'not supportive' of Wimbledon ban of Russian players but has no 'right answer'	https://www.bbc.co.uk/sport/tennis/61293193?at_medium=RSS&at_campaign=KARANGA	Andy Murray x not supportive x of Wimbledon ban of Russian players but has no x right answer x Andy Murray says he is not supportive of players from Russia and Belarus being banned from Wimbledon but adds that there is no right answer on the issue	2022-05-01 23:35:54
ビジネス	ダイヤモンド・オンライン - 新着記事	ロシア、ウクライナ紛争は「西側との戦争」 - WSJ発	https://diamond.jp/articles/-/302706	西側	2022-05-02 08:25:00
北海道	北海道新聞	ナダル「非常に不公平」　ウィンブルドンのロシア除外に	https://www.hokkaido-np.co.jp/article/676423/	四大大会	2022-05-02 08:14:00
ビジネス	東洋経済オンライン	ホンダが仕掛ける電池戦略の｢必然｣と｢死角｣ ホンダOBが明かす､電池開発｢30年の歴史｣ | 電動化 | 東洋経済オンライン	https://toyokeizai.net/articles/-/585184?utm_source=rss&utm_medium=http&utm_campaign=link_back	東洋経済オンライン	2022-05-02 08:08:00
IT	週刊アスキー	食品ロスのサブスク、何が届くかわからない『ロスゼロ不定期便』毎月5トンの食品ロスを削減	https://weekly.ascii.jp/elem/000/004/088/4088669/	食品ロス	2022-05-02 08:30:00