投稿時間:2021-12-24 01:36:15 RSSフィード2021-12-24 01:00 分まとめ(41件)

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python	Pythonタグが付けられた新着投稿 - Qiita	Python3ではじめるシステムトレード：ドローダウン	https://qiita.com/innovation1005/items/d29f47eae568159b9e56	また、そのときの最大の損失額を知っておくことも必要です。	2021-12-24 00:59:53
python	Pythonタグが付けられた新着投稿 - Qiita	ワイ「Juliaってなんぞや？」	https://qiita.com/Kazuryu/items/f1084487d81841fd47aa		2021-12-24 00:05:28
python	Pythonタグが付けられた新着投稿 - Qiita	LZ78圧縮をpythonで実装した	https://qiita.com/maru1010/items/f9347f94c82ff7597bb2	結果的に辞書の単語は先頭からababccccccabcという文字列が登録される。	2021-12-24 00:02:36
js	JavaScriptタグが付けられた新着投稿 - Qiita	【PHP】buttonタグのsubmitした値がPOSTされなかった話	https://qiita.com/limithand/items/bcec6d519c2a2a45e9c2	結論未解決記述を変更したが、二重送信防止のためのdisabed処理を実装している場合、Chromeでは値が送信されなかった。	2021-12-24 00:03:51
Program	[全てのタグ]の新着質問一覧｜teratail（テラテイル）	Python＆Sqlite3 タプルの値をテーブルに格納したい	https://teratail.com/questions/375319?rss=all	PythonSqliteタプルの値をテーブルに格納したい前提環境WindowsnbspnbspPythonnbspnbspsqlitenbsp実現したい事Pythonでタプル型の値をsqliteのテーブルに格納したいです。	2021-12-24 00:50:31
Program	[全てのタグ]の新着質問一覧｜teratail（テラテイル）	ランレングスの解凍プログラムが正しいかチェックしてもらいたい	https://teratail.com/questions/375318?rss=all	ランレングスの解凍プログラムが正しいかチェックしてもらいたいCでランレングスの解凍プログラムを作成したのですが、あっているかチェックして欲しいのですがよろしいでしょうか。	2021-12-24 00:40:51
AWS	AWSタグが付けられた新着投稿 - Qiita	AWS X-Rayをとりあえず使ってみたいハンズオン	https://qiita.com/Takumi-Miura/items/2b9a944bdf6076e6bdcd	AWSにデプロイされたアプリケーションにSDKを組み込むことによって、アプリケーションのリクエスト・レスポンスの状況や、アプリケーションから発行されたデータベース、APIへのアクセスのレスポンス時間など、アプリケーションの稼働状況に関する様々な情報を取得することができるというものです。	2021-12-24 00:56:37
AWS	AWSタグが付けられた新着投稿 - Qiita	SORACOM IoT DIYレシピで始める工作。"画面に近づきすぎると警告してくれるロボット"を作ってみた	https://qiita.com/yoyoda/items/b7246a8d120626cf4ba6	AdventCalendar投稿とても良い経験になりました。	2021-12-24 00:45:26
AWS	AWSタグが付けられた新着投稿 - Qiita	AWS TransferFamily + S3 でSFTP構成	https://qiita.com/sonoda3456/items/833dc8e98e4b24cb0f12	作成したロール「LambdaGetSecretManagerKey」を入力詳細設定なし関数の作成を選択し、完了③作成した関数を選択し、コードソースに以下のコードを入力※pythonなのでインデントに注意してください。	2021-12-24 00:17:42
AWS	AWSタグが付けられた新着投稿 - Qiita	AWS ソリューションアーキテクト（SAA）の勉強ノート	https://qiita.com/Kakachiya/items/20b538f44a64c3bb56e4	タイムアウトに達すると関数が停止される最大同時実行数はデフォルトで最大はだが、申請によって数十万まで引き上げ可能関数の実行時に使用できるメモリはMBMBと制限されているtmpディレクトリのストレージはMBまでとされているLambdaレイヤー共通処理関数は最大妻で設定可能LambdaエッジLambdaEdgeCloudFrontの配信コンテンツをLambda関数によってエッジロケーションで処理することが可能RouteIPアドレスを人間が読みやすいURLに変換して住所として利用できるようにしてくれるDNSサーバーの役割を提供する→DNS→、IPアドレスに変換するのがDNSポートで動作するため、Routeと呼ばれるエイリアスレコードタイプAホスト名とIPvアドレスの関連づけを定義するレコードMXメールの配送先メールサーバーのホスト名を定義するレコードCNAME正規ホスト名に対する別名を定義するレコード特定のホスト名を別のドメイン名に転送する時などに利用するルーティングポリシーシンプルルーティングレコードセットで事前に設定された値のみに基づいてDNSクエリに応答する特殊なルーティングポリシーを使わない標準的な対のルーティング加重ルーティング複数エンドポイントごとの重み設定によりDNSクエリに応答する指定した比率で複数リソースにトラフィックをルーティングする際に使用するABテストAパターンとBパターンを比べて修正後のBがどの程度の成果が出るかを検証するテストのために新サービスをリリースしたサーバーに一定割合のユーザーを誘導したい場合にも利用できるフェイルオーバールーティングヘルスチェックの結果に基づいて、利用可能なリソースをDNSクエリに応答するスタンバイアクティブ方式でアクティブ側のヘルスチェックが失敗したときにスタンバイ側のシステムへルーティングする本番システム稼働時にSorryサーバーのIPアドレスをセカンダリレコードに登録しておくと、自動的にSorryコンテンツを表示できる複数値回答ルーティングランダムに呼ばれた最大つの別々のレコードを使用してIPアドレスを設定し複数値を返答するつのレコードに異なる複数のIPアドレスを登録しておき、ランダムに返却されたIPアドレスに接続するヘルスチェックがNGとなったIPアドレスは返却されないため、正常に稼働しているサーバーに対してのみアクセスを分散させることができるレイテンシールーティングリージョンの遅延によりDNSクエリに応答する基本的にユーザー最寄りのリージョンに返答する位置情報ルーティングユーザーのIPアドレスにより位置情報を特定して、地位ごとに異なるレコードを返すネットワーク構成に依拠しない精度の高いレコードの区分けが可能地理的近接性ルーティングユーザーとリソースの場所に基づいて地理的近接性ルールを作成してトラフィックをリーティングする必要に応じてバイアスを設定し、特定のリソースにルーティングするトラフィック量を変更できるトラフィックフローを利用する必要があるフェイルオーバーリージョンを跨いで設定することができるアクティブパッシブ方式プライマリリソースをアクティブなリソースとしてルーティングする障害発生時、Routeはセカンダリリソースをルーティングするフェイルオーバーポリシーを使用して設定するアクティブアクティブ方式複数のリソースをアクティブとしてルーティングする障害発生時、正常なリソースにフェイルバックするフェイルオーバー以外のルーティングポリシーを使用して設定するAuroraRDBの一つだが、マルチクラスタ構成を採用している従来のRDBは集中管理するものだが、クラウド時代の分散型のRDBとして誕生した高い並列処理によるクエリを高速処理が実現できる大量の書き込みや読み込みを同時に扱うことができるDBの集約やスループット向上が見込まれるMySQLとPostgreSQLと互換性があり、同じ操作方法で扱うことができる耐障害性と自己回復性つのAZにつのコピーを設置可能で合計つのコピーを保持する過去のデータがそのままSに継続的にバックアップされるリストアも差分適用がなく高速に処理できるどのタイミングでも安定したリストアを実現できるの高可用性と高耐久性を持つ。	2021-12-24 00:17:03
Docker	dockerタグが付けられた新着投稿 - Qiita	DockerでLaravel×Elasticsearch環境を作る	https://qiita.com/yodai/items/3d27c6abad4b948c8ceb	composerrequiretamayolaravelscoutelasticエンジンの処理の挙動はカスタマイズしたい場合があるので、app配下にエンジンを継承したファイルを用意する。	2021-12-24 00:11:09
海外TECH	MakeUseOf	7 Wellness Subscriptions You Can Gift Your Loved Ones This Christmas	https://www.makeuseof.com/wellness-subscriptions-gifts-christmas/	christmaswant	2021-12-23 15:45:11
海外TECH	MakeUseOf	TikTok Suggests Your Account to Others in Sneaky Ways: How to Stop It	https://www.makeuseof.com/tiktok-suggests-account-how-to-stop/	TikTok Suggests Your Account to Others in Sneaky Ways How to Stop ItTikTok doesn t only recommend your account to others based on contact syncing Here are the other methods it uses and how to stop it	2021-12-23 15:30:55
海外TECH	MakeUseOf	How to Make a Discord Bot	https://www.makeuseof.com/how-to-make-discord-bot/	discord	2021-12-23 15:15:12
海外TECH	DEV Community	Unit and Integration test Spring Boot applications with Spring Testing and JUnit	https://dev.to/pavankjadda/unit-and-integration-test-spring-boot-applications-with-spring-testing-and-junit-ebb	Unit and Integration test Spring Boot applications with Spring Testing and JUnitThis blog post explains the process to Unit test and Integration test Spring Boot application with JUnit and Spring Testing library Unit TestsTypical Spring Boot application divided into layersController or WebServiceRepository or DAO Repository layer TestingLet s start with Repository layer See below example Spring Boot Repository layer unit TestThe above test class show cases Employee Repository class We use DataJpaTestannotation for this Here are the step by step instructionsAlways use DataJpaTest for Repository later testsDisable Auto Configuring Test Database if you want to use existing database AutoConfigureTestDatabase replace AutoConfigureTestDatabase Replace NONE Otherwise just use AutoConfigureTestDatabaseDefine Main Class Properties and Config classes in ContextConfigurationIf you define RefreshScope scope in your code use ImportAutoConfiguration RefreshAutoConfiguration class to auto import the config for RefreshScopeDefine or select profile using ActiveProfiles value local If use password vault like Hashicorp vault make sure to pass the role id and secret id during test start up See below example for IntelliJ IDE tests Service Layer TestingIf we want to test service layer we need to mock Repository layer and build Service class See below example for EmployeeServiceTest class The above test class show cases Employee Service class Here are the step by step instructionsUse SpringBootTest for Service layer tests and make sure to use webEnvironment RANDOM PORT to let system select random port during start upDefine or select profile using ActiveProfiles value local Auto configure MockMvc using AutoConfigureMockMvc annotation Define TestInstance Class to configure the lifecycle of test instances for the annotated test class or test interface If TestInstance is not explicitly declared on a test class or on a test interface implemented by a test class the lifecycle mode will implicitly default to PER METHOD If you define RefreshScope scope in your code use ImportAutoConfiguration RefreshAutoConfiguration class to auto import the config for RefreshScopeAnd at last If use password vault like Hashicorp vault make sure to pass the role id and secret id during test start up See the example in Repository layer Test Controller or Web layer testThe controller or web layer can be tested using MockMvc See below example The controller tested using MockMvc which performs REST API request just like Frontend Mobile application client The above request looks similar to Service Layer test with changesWe are mocking PersonService instead of PersonRepositoryInjected demo user into Spring Security using WithUserDetailsSince the REST API is protected by Spring Security we use WithUserDetails annotation to mock user demo user into Spring Security context Remember this user must exist in Database Integration testsThe integration tests look similar to Controller layer tests but with one difference Instead of mocking the service layer the test hits actual Service and Repository layer Spring Boot Integration TestWe can also define WithUserDetails annotation at method level such that different users with different access levels can be tested Happy Coding	2021-12-23 15:26:18
海外TECH	DEV Community	Is golangci-lint Generics Readiness?	https://dev.to/cia_rana/is-golangci-lint-generics-readiness-200n	Is golangci lint Generics Readiness This post is Day of Go Advent Calendar jp golangci lint is easy to use a very large of linters with a configuration file On the other hand it depends on a lot of linters which makes it difficult to incorporate the latest implementations of them Also many of them have not been updated for some time In such a situation Go could introduce Generics at any moment So I checked whether the linters support Generics or not and summarized the results in the following list In order to check if each linter supports or is going to support Generics I search the issues and pull requests from the last months using the keywords generics type and NameStatusRemarkdeadcodeno update for yearserrcheck gosimple govet vetineffassign staticcheckissue exists but not yet supportedstructcheckno update for years Reference to the package changed from GitHub to GitLab typecheck unused varchecksame as structcheckasciicheck bidichk bodyclose contextcheck cyclop depguard dogsled dupl durationcheck errchkjson errname errorlint exhaustiveThere is no indication of how it will be implemented but there is an issue that talks about the need to update it exhaustivestruct exportloopref forbidigo forcetypeassert funlenno update for a yeargci gochecknoglobals gochecknoinits gocognit goconst gocriticPreviously fixed error is recurring gocyclo godot godoxissue tab is hiddengoerr gofmtReferencing standard packages via golangci gofmt so some may not be supported gofumptgoheader goimportssame as gofmtgolintdeprecated and archivedgomnd gomoddirectives gomodguard goprintffuncnameno update for yearsgosec ifshort importas interfacerdeprecated and archivedireturn lll makezero maligneddeprecated and archivedmisspellno update for yearsnakedret nestif nilerrno update for a yearnilnil nlreturn noctx nolintlint paralleltest prealloc predeclared promlinter revive rowserrcheck scopelintdeprecated and archivedsqlclosecheck stylecheck tagliatelle tenv testpackage thelper tparallel unconvertno update for yearsunparamThere is an issue that states that x tools go ssa supports Generics and then supports it varnamelen wastedassign whitespaceno update for yearswrapcheck wsl Currently most of the linters do not yet support Generics and few of them have taken any action to support it Even if the various linters support Generics the latest golangci lint will probably support it in due course The reason for the lack of support may be that the official x tools including go ssa do not yet support Generics Therefore for production services that use golangci lint regularly it is better to experiment with Generics in the development environment only and wait for a while before using it in the production environment Conversely it might be a chance to contribute them There may be linters that do not fail with or without Generics Also some of them may actually support Generics due to my lack of confirmation and some of them may support Generics after this post was published because I couldn t keep up with the latest information If this is the case please let me know in the comments	2021-12-23 15:18:16
海外TECH	DEV Community	The state of pattern matching in Java 17	https://dev.to/deepu105/the-state-of-pattern-matching-in-java-17-1c9m	The state of pattern matching in Java Originally published at deepu tech So what exactly is pattern matching The act of checking a given sequence of tokens for the presence of the constituents of some patternWikipediaOr simply put it s a language feature where you can test for a specific pattern on a character sequence or a data structure Pattern matching can be classified into two types Sequence patterns pattern matching on character sequence or strings Also known as our beloved Regular Expressions ーI still wish I could write RegEx without cursing and looking up the syntax Tree patterns testing for patterns on a data structure This is what we are going to talk about today Why Pattern matching Why do we need pattern matching We don t to be honest Pattern matching is not a requirement for a good programming language Many of the most popular languages like JavaScript Java and Go get by just fine without it But still it s a great feature to have due to these advantages it offersReduced cognitive complexityMuch more concise code and better readability More complex logic can be expressed with fewer lines of code While not very important it s still a good thing Simpler to write and maintain Reduced reliance on reflection and casting especially in Java Avoid bugs caused by pattern dominance and pattern non exhaustiveness Pattern dominance is when a previous pattern supersedes another making it unreachable A modern compiler should be able to catch it Pattern exhaustiveness is when the compiler warns you when you have not checked for all possible variants of a type like having a case for all enum values or all subclasses of a type and so on Of course these advantages depend on how a language implements pattern matching So later we will look at these from the perspective of Java Pattern matching featuresThese are many languages that have great support for pattern matching Rust and OCaml lead the pack here On the JVM world Scala also offers many of these pattern matching features So when a language claims to have support for pattern matching these are the features we expect Enum matching in switch statements ーMost languages including Java already does thisMatch the value in switch if statements ーCommon in any Turing complete languageMatch type in switch if statements ーRequired for pattern matchingPattern matched variable assignmentsNull checks ーRequired in a language like JavaType guardsRefined patterns ーIf we can match for data types then its logical to expect refining the pattern further using the matched type which acts as a type guardPattern dominance and type exhaustionPartial Nested Compound type and or value checksShallow Deep Position based Destructured matchingIt s not an exhaustive list but more of a general expectation to fulfill the previous advantages we saw Pattern matching in JavaUnfortunately Java is still a bit behind the curve when it comes to pattern matching But fortunately we already have most of the building blocks required to achieve most of the features we saw earlier Switch statementsSwitch expressions Java ーAs compared to the switch statements switch expressions can return a value have multiple case labels on the same line and need to be exhaustive And hence can be used for variable assignments and statements without fallthroughPattern matching for instanceof Java ーIt can now pattern match data types which means casting after a check is no longer required and this can be used in if statements assignments and returns Sealed classes Java Pattern matching for switch Java preview JEP Now let us look at some examples of what is already possible to do as of Java Pattern matching for instanceofFrom Java onwards we can do pattern matching using the instanceof operator It can be used on if statements and we can use it as type guards on variable assignments and returns This lets us use a variable without further casting after a type check This is a new syntax added to the language Here we can see pattern matching using the instanceof operator in action A type and a variable name follow the operator and we can access the variable without further casting Beforeif obj instanceof String String s String obj System out println s length Afterif obj instanceof String s Let pattern matching do the work System out println s length We can also use pattern matching as a type guard in returns and variable assignments See how concise the code is when we do the return using a type guard instead of casting the type Beforepublic boolean equals Object o if o instanceof Point return false Point other Point o return x other x amp amp y other y Afterpublic boolean equals Object o return o instanceof Point other amp amp x other x amp amp y other y Here is a variable assignment using a type guard Again the code is much nicer with pattern matching Beforevar x o instanceof Point Point o x System out println x Aftervar x o instanceof Point p p x System out println x For a realistic use case we could do something like below when we want to do different logic based on the type using the instanceof operator But that s a lot of if else and cognitive load static String formatter Object o String formatted unknown if o instanceof Integer i formatted String format int d i else if o instanceof Long l formatted String format long d l else if o instanceof Double d formatted String format double f d else if o instanceof String s formatted String format String s s return formatted Pattern matching for switchBut with the new preview feature in Java we can do pattern matching for data types in switch cases as well For Both switch statements and switch expressions This will let us rewrite the previous code using a switch expression like below As you can see this is also a new syntax And it s similar to the one added to the instanceof operator static String formatter Object o return switch o case Integer i gt String format int d i case Long l gt String format long d l case Double d gt String format double f d case String s gt String format String s s default gt o toString This has Reduced cognitive complexity and the syntax is closer to most other languages with pattern matching With this the compiler can warn us when pattern dominance occurs as generic types should always come after specific types Since this is a preview feature the syntax might change in future versions I hope not as I find this syntax nice in Java We can also do null checks in these switch cases which makes pattern matching more useful in the case of Java static String formatter Object o return switch o case null gt Oops case String s gt String format String s s default gt o toString orstatic String formatter Object o return switch o case String s gt String format String s s case null default gt Oops Type Guards amp pattern refinementAs we saw earlier Type guards are already supported for instanceof operator from Java onwards and Java preview adds that for switch cases as well This means we can rely on the type guards to refine the patterns further to have conditions relations and value checks static void test Object o if o instanceof String s amp amp s length gt System out println s else System out println Not a string Orstatic void test Object o switch o case String s amp amp s length gt gt System out println s case String s gt System out println Invalid string default gt System out println Not a string While it s not as flexible as in Rust or OCaml it s a good start in my opinion Pattern exhaustion with Sealed classesWe need to understand another new feature in Java Sealed classes to understand pattern exhaustion Sealed classesA sealed class lets you control which class can extend it The same applies to sealed interfaces as well Permitted classes can be defined either as simple inner classes or in separate class files using the new permits keyword public abstract sealed class Shape permits Circle Rectangle Square Orpublic abstract sealed class Shape final class Circle extends Shape final class Square extends Shape final class Rectangle extends Shape A sealed class imposes three constraints on its permitted sub classes A Sealed class and its permitted subclasses must be in the same module or the same package in case of an unnamed module Every permitted subclass must directly extend the sealed class Every permitted subclass must use a modifier to describe the propagation of sealing Allowed modifiers are final sealed and non sealed Final subclasses cannot further be extended Hence the class hierarchy ends with them Records are implicitly final and hence do not need the keyword A Sealed subclass can further restrict class hierarchy with its own permitted subclasses and the same three rules apply all over again for themA Non sealed subclass is a bit different As the keyword suggests it reverts to being open for extension by any class and breaks the class hierarchy rules set by the parent sealed class Non sealed sub classes are still valid children and work well with other concepts We will see that later A fun fact non sealed is the first hyphenated keyword in Java Here is how it would look in practice Sealed classes can also be used with Records Here the Shape interface is sealed and it permits Circle Rectangle Square and WeirdShape as subclasses Circle is implicitly final as it s a record Square is declared as final And hence both cannot be extended further and their hierarchy ends here Rectangle is declared as sealed and permits only TransparentRectangle and FilledRectangle as subclasses Hence Rectangle s class hierarchy can extend further and TransparentRectangle and FilledRectangle can even define their own hierarchy WeirdShape is declared as non sealed and hence can be extended by any other class or record Here the class hierarchy is wide open and subclasses of a WeirdClass do not have to follow the rules of a sealed class All instances of subclasses of WeirdShape will also be an instance of WeirdShape and hence any code that checks for exhaustiveness of subtypes of Shape will still be valid public sealed interface Shape permits Circle Rectangle Square WeirdShape public record Circle int r implements Shape public final class Square implements Shape public sealed class Rectangle implements Shape permits TransparentRectangle FilledRectangle public non sealed class WeirdShape implements Shape A sealed class can be abstract and can have abstract members and similarly sealed interfaces can have default implementations and so on But abstract subclasses should be sealed or non sealed and not final Extending a non permitted class with a sealed class will be a compile time error Another fun fact A combination of sealed classes and records is nothing but algebraic data types type formed by combining others ex Tuples Records unions Pattern exhaustionRemember pattern exhaustion we talked about The java compiler cannot check for all possible variations for normal classes and hence would require us to add a default case to avoid missing paths in a switch expression as switch expressions do not fall through and must be exhaustive in Java That does not apply to switch statements as we can choose not to have a default case for them as they fall through But with sealed classes the compiler knows exactly what the expected variants are We can use this for exhaustive pattern matching In that case the compiler will warn when we miss a variant in the check without adding a default case This is a much less error prone and clearer approach Even if the subclasses are non sealed the compiler will still do the exhaustiveness check See this example if we use the same sealed classes we saw earlier in the first sample we will get a compile time error as we are not checking all variants of Shape and there is no default case In the second example however there is no error even without a default case as the compiler knows all possible variants of Shape have been accounted for If we remove the sealed keyword for Shape then the second sample will have the same error as there is no default case and the compiler doesn t know about all variants of Shape Shape rotate Shape shape double angle return switch shape this will be switch expression does not cover all possible input values error case Circle c gt c case Square s gt shape rotate angle Shape rotate Shape shape double angle return switch shape case Circle c gt c case Rectangle r gt shape rotate angle case Square s gt shape rotate angle case WeirdShape w gt shape rotate angle still exhaustive no default needed Partial patterns and destructingThere is a candidate feature to add preview for destructing deconstruction syntax for the instanceof operator so logically at some point that should extend to the switch syntax as well There are also talks about improving the feature further to add support for primitives in switch case patterns and to declare how it should be deconstructed at the class level so that normal classes can also be deconstructed Record Patterns amp Array Patterns Preview JEP So far the only solid thing is the candidate for deconstruction in instanceof operator With this proposal we should be able to deconstruct Records and Arrays This is closer to how it works in Rust for example Look at how Point is deconstructed to its members and we can directly use the members with type guardrecord Point int x int y void printSum Object o if o instanceof Point int x int y System out println x y Deconstruction can be nested as well but doesn t have any facility for ignoring members like in other languages yet record Point int x int y enum Color RED GREEN BLUE record ColoredPoint Point p Color c void printSum Object o if o instanceof ColoredPoint Point int x int y Color c System out println x y Array deconstruction is also proposed and syntax is a bit similar to array deconstruction in JavaScript Thankfully at least elements at the end can be ignored in this case it would be pretty useless otherwise See how the string array is deconstructed to the first two elements with the rest ignored The syntax is closer to the new array syntax as well static void printFirstTwoStrings Object o if o instanceof String String s String s System out println s s Nested deconstruction is also possible for a mix of arrays and records See how an array of Points are deconstructed here And yes var should work instead of type as well static void printSumOfFirstTwoXCoords Object o if o instanceof Point Point var x var y Point var x var y System out println x x Of course it s a baby step and not as powerful as deconstruction in Rust or JS but I hope we get there and even this baby step would make pattern matching much more powerful Hopefully this would be extended to switch as well That would make pattern matching in Java closer to complete with only normal classes remaining to be accounted for If the normal classes can specify how they should be deconstructed that issue will be solved and we will have powerful pattern matching in Java ConclusionSo based on what we saw so far the state of pattern matching in Java is as below Enum matching in switch statements Match type value in switch statements Match type value in if statements Pattern matched variable assignments Null checks Type guards Refined patterns Pattern dominance and type exhaustion Partial Nested Compound type and or value checks Shallow Deep Position based Destructured matching Most of the basic requirements are met with the instanceof operator pattern matching and the Java preview makes many other features possible Of course type exhaustion only works for sealed classes and refined patterns are still quite basic but the majority of the features for proper pattern matching are already available with the preview To summarize these are the current and future limitations as far as we can seeJDK previewNo deconstructionNo nested patternsType exhaustion is only for sealed classes and enumsPattern refinement is limitedStill a preview featureJDK maybe No deconstruction for classes and in switch casesNo nested patterns for classes and in switch casesType exhaustion is only for sealed classes and enumsNo feature for ignoring don t care patterns during deconstructionNo named patternsStill a preview featureIn a future version of Java some of these limitations might be removed at least for instanceof operator We probably would still have to wait a few years before we can actually start using full fledged pattern matching in production I ll update this post when more features are released If you like this article please leave a like or a comment You can follow me on Twitter and LinkedIn Cover image credit Meme from makeameme org	2021-12-23 15:11:44
海外TECH	DEV Community	Node JS	https://dev.to/munni2244/node-m88	Node JS JWTJWT means JSON Web Token Its used to share secretly information between to parties client and server JWT use as a secure way to authentication share user information JWT mechanism to verify the owner of JSON How JWT Token Work JWT token based authentication and its stateless That means the user state is never saved in server memory but the state is sorted inside the token JWT request to other parties JWT have of parts Header Payload Signature JWT Look LikesAaaaaaaaaa bbbbbbbbbbbbb ccccccccccccThe first part is header and second part is payload and the last part is signature MongooseMongoose is a mongodb ODM object database modeling Mongoose is a way to make connection mongodb database It provide mongodb validation Its very simple and it make development first And it includes query validation and logic hook It work in asynchronous environment Installation mongoose npm install mongoose CRUD OperationCrud are the four basic operation its create read update delete The crud operation is refers to the major operation which are implement by database It can also describe the user interface convention that allow searching modifying Create The create function allows to user record create in the database The create function is called INSERT Read The read function is search specific function and read there value UpdateThe update function is modify existing record that exist in database DeleteThe delete function allows user to remove record in the database Express of Node JSExpress js is a back end web application framework for node js It s a free and open source It designed for building web application and API Following are some of the core feature of express framework •Respond HTTP request•Allows the middleware•Allows to dynamically render to HTML pages Installation command npm install expressExample const express require “express const app express	2021-12-23 15:11:39
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海外TECH	Engadget	How the pandemic supercharged the creator economy in 2021	https://www.engadget.com/how-the-pandemic-supercharged-the-creator-economy-153050958.html?src=rss	How the pandemic supercharged the creator economy in The multibillion dollar industry of game streamers beauty vloggers podcast producers fitness influencers newsletter writers and other social media stars who make up the “creator economy began long before Yet saw more platforms throw more money and resources at independent content creators than ever before This year companies that had previously shown little interest in courting “influencers or building relationships with creators began to invest in building monetization tools for them And even more established creator friendly companies significantly ramped up their investments with new funds and tools Twitter which had previously only ever had a single monetization feature ーa video centric tool used by publishers ーopted to reorient its entire platform around creators It built Super Follows a Patreon esque subscription service for influencers It launched Ticketed Spaces so people could make money from its burgeoning live audio feature It launched in app tripping and started building a newsletter platform Snapchat which at one time actively shunned the idea of influencers just announced that it had funneled more than million to creators via its Spotlight feature which launched at the end of Some of the app s biggest stars are even getting their own shows in Snapchat Discover Facebook also took a renewed interest in the influencers and content creators who had long asked for more opportunities from the platform Mark Zuckerberg has repeatedly labeled creators as one of the company s top priorities and announced a plan to invest billion into tools for them by the end of Since then Facebook and Instagram have launched a dizzying number of creator focused updates and monetization features Platforms not traditionally associated with influencers also began throwing money at creators and monetization features Pinterest launched a creator fund and built its first monetization tools LinkedIn ーyes that LinkedIn ーannounced a million fund Clubhouse added tipping Tumblr meanwhile launched a subscription service for its bloggers Even YouTube the most established platform for creators to make money identified “growing the creator economy as its top priority It launched an all new million fund just for Shorts its TikTok like feature TikTok itself which started a million fund in also launched new monetization features With all that money flowing in it s no surprise that the number of individual creators also boomed One report from payments company Stripe which powers payments for dozens of influencer platforms found that the number of creators was up percent in compared with And that s just a “fraction of the total ecosystem according to the company “If the recent exponential growth of the creator economy keeps up these platforms could be supporting more than million creators in five years the company wrote StripeGrowth wasn t limited just to the major platforms either Startups catering to content makers and their needs also surged with more than billion in funding going toward “startups focused on creators according to a report in The Information One of the main drivers of this surge in activity was the pandemic While creators were making money long before the pandemic the industry was almost perfectly primed to absorb many of the changes brought on by it “I think the pandemic definitely turbocharged the creator economy through both necessity and through choice Li Jin founder of Atelier Ventures a venture capital firm that invests in the creator economy said in an interview earlier this year “Necessity meaning a lot of people were left without offline alternatives for work and income and had to turn to online platforms in order to continue their creative careers And choice in the sense that obviously we had a lot of free time during the pandemic where we were just kind of stuck at home I think a lot of people took that time and they started creating content At the same time the pandemic also seems to have shifted the way that many people think about work itself While this year was full of hand wringing about labor shortages and whether or not people want to go back to work it s not difficult to understand why some particularly younger people might opt for a different path Zuckerberg described the shift as “​​people being able to make a living by expressing their creativity and by doing things they want to do rather than things they have to Creators he has said deserve to be “rewarded for their work But as Jin and others have pointed out major platforms aren t suddenly embracing creators just because they care about helping them create sustainable independent businesses The economics are ultimately weighted in their favor as well Creators are responsible for a significant amount of engagement on their platforms of choice If enough of an app s biggest stars leave they could take large chunks of users with them Revenue from creators could also one day help Facebook generate income beyond advertising Zuckerberg has pledged not to take a cut of their earnings until but even a relatively small commission could eventually add up to a significant amount Likewise Twitter has said it plans to take a percent cut of Super Follow subscriptions from its highest earning creators though it could still be some time before the feature makes serious cash for anyone Creators are also crucial to drawing in new users and keeping platforms existing ones entertained For Facebook they could help the company avoid or at least dampen the “existential threat of declining teen users Snapchat has touted Spotlight as a key source of growth Even LinkedIn has said creators can help their users get “better at what they do Ultimately though it s the platforms that will benefit most from creators according to 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