Dmitry Komanov dkomanov
dkomanov
/ IfElseSync.scala
Created
May 22, 2020 21:54
[writing-async-app-in-scala-part-1] sync if-statement
This file contains bidirectional Unicode text that may be interpreted or compiled differently than what appears below. To review, open the file in an editor that reveals hidden Unicode characters.
Learn more about bidirectional Unicode characters
| def condition: Boolean = ... | |
| def action1(): Unit = ... | |
| def action2(): Unit = ... | |
| if (condition) { | |
| action1() | |
| } else { | |
| action2() | |
| } |
dkomanov
/ IfElseAsync.scala
Created
May 22, 2020 21:55
[writing-async-app-in-scala-part-1] async if-statement
This file contains bidirectional Unicode text that may be interpreted or compiled differently than what appears below. To review, open the file in an editor that reveals hidden Unicode characters.
Learn more about bidirectional Unicode characters
| def condition: Future[Boolean] = ... | |
| def action1(): Future[Unit] = ... | |
| def action2(): Future[Unit] = ... | |
| condition.flatMap( | |
| if (_) | |
| action1() | |
| else | |
| action2() |
dkomanov
/ IfElseMultipleConditions.scala
Created
May 22, 2020 21:57
[writing-async-app-in-scala-part-1] multiple statement
This file contains bidirectional Unicode text that may be interpreted or compiled differently than what appears below. To review, open the file in an editor that reveals hidden Unicode characters.
Learn more about bidirectional Unicode characters
| def condition1: Boolean = ... | |
| def condition2: Boolean = ... | |
| def condition3: Boolean = ... | |
| if (condition1 && (condition2 || condition3)) ... |
dkomanov
/ BooleanOps1.scala
Created
May 22, 2020 21:58
[writing-async-app-in-scala-part-1] BooleanOps1
This file contains bidirectional Unicode text that may be interpreted or compiled differently than what appears below. To review, open the file in an editor that reveals hidden Unicode characters.
Learn more about bidirectional Unicode characters
| implicit class FutureOfBooleanExtensions(val future: Future[Boolean]) extends AnyVal { | |
| def &&(other: => Future[Boolean]): Future[Boolean] = | |
| future.flatMap(value => if (!value) Future.successful(false) else other) | |
| def ||(other: => Future[Boolean]): Future[Boolean] = | |
| future.flatMap(value => if (value) Future.successful(true) else other) | |
| } |
dkomanov
/ IfElseAsyncMultipleOps.scala
Created
May 22, 2020 21:59
[writing-async-app-in-scala-part-1] multiple statement
This file contains bidirectional Unicode text that may be interpreted or compiled differently than what appears below. To review, open the file in an editor that reveals hidden Unicode characters.
Learn more about bidirectional Unicode characters
| def condition1: Future[Boolean] = ... | |
| def condition2: Future[Boolean] = ... | |
| def condition3: Future[Boolean] = ... | |
| val condition = condition1 && (condition2 || condition3) | |
| condition.flatMap( | |
| if (_) | |
| ... | |
| else | |
| ... |
dkomanov
/ BooleanOps2.scala
Created
May 22, 2020 22:00
[writing-async-app-in-scala-part-1] BooleanOps2
This file contains bidirectional Unicode text that may be interpreted or compiled differently than what appears below. To review, open the file in an editor that reveals hidden Unicode characters.
Learn more about bidirectional Unicode characters
| implicit class BooleanToFutureExtensions(val v: Boolean) extends AnyVal { | |
| def &&(other: => Future[Boolean]): Future[Boolean] = | |
| if (v) other else Future.successful(false) | |
| def ||(other: => Future[Boolean]): Future[Boolean] = | |
| if (v) Future.successful(true) else other | |
| } |
dkomanov
/ IfElseAsyncMultipleOps2.scala
Created
May 22, 2020 22:02
[writing-async-app-in-scala-part-1] multiple statements mixed Boolean and Future[Boolean]
This file contains bidirectional Unicode text that may be interpreted or compiled differently than what appears below. To review, open the file in an editor that reveals hidden Unicode characters.
Learn more about bidirectional Unicode characters
| def condition1: Boolean = ... | |
| def condition2: Boolean = ... | |
| def condition3: Future[Boolean] = ... | |
| val condition = condition1 && (condition2 || condition3) | |
| condition.flatMap( | |
| if (_) | |
| ... | |
| else | |
| ... |
dkomanov
/ BooleanOps3.scala
Created
May 22, 2020 22:09
[writing-async-app-in-scala-part-1] BooleanOps3
This file contains bidirectional Unicode text that may be interpreted or compiled differently than what appears below. To review, open the file in an editor that reveals hidden Unicode characters.
Learn more about bidirectional Unicode characters
| implicit class FutureOfBooleanExtensions(val future: Future[Boolean]) extends AnyVal { | |
| def &&(other: => BooleanOrFutureOfBoolean): Future[Boolean] = | |
| v.flatMap( | |
| if (_) | |
| other match { | |
| case Bool(otherValue) => Future.successful(otherValue) | |
| case Fut(future) => future | |
| } | |
| else | |
| Future.successful(false) |
dkomanov
/ ForComprehensions1.scala
Created
May 22, 2020 22:14
[writing-async-app-in-scala-part-1] for-comprehensions 1
This file contains bidirectional Unicode text that may be interpreted or compiled differently than what appears below. To review, open the file in an editor that reveals hidden Unicode characters.
Learn more about bidirectional Unicode characters
| def getMovie: Future[Movie] | |
| def getActors(movie: Movie): Future[Seq[Actor]] | |
| def getPlot(movie: Movie): Future[MoviePlot] | |
| for { | |
| movie <- getMovie | |
| actors <- getActors(movie) | |
| plot <- getPlot(movie) | |
| } yield MovieDescription(movie, actors, plot) |
dkomanov
/ ForComprehensions2.scala
Created
May 22, 2020 22:14
[writing-async-app-in-scala-part-1] for-comprehensions 2
This file contains bidirectional Unicode text that may be interpreted or compiled differently than what appears below. To review, open the file in an editor that reveals hidden Unicode characters.
Learn more about bidirectional Unicode characters
| def hasPermissions: Future[Boolean] | |
| for { | |
| isPermitted <- hasPermissions | |
| if isPermitted | |
| movie <- getMovie | |
| if !movie.hidden | |
| actors <- getActors(movie) | |
| plot <- getPlot(movie) | |
| } yield MovieDescription(movie, actors, plot) |