WebDec 29, 2024 · Schedule Future. Now that we have an ExecutionContext, it’s time to create a Future that will run a long-running operation in the background. We’ll simulate this with Thread.sleep: def generateMagicNumber (): Int = { Thread .sleep ( 3000 L) 23 } val generatedMagicNumberF: Future [ Int] = Future { generateMagicNumber () } WebOct 6, 2024 · A Scala Either, Left, and Right example (like Option, Some, and None) alvinalexander.com try, catch, and finally syntax declare a null var before try/catch mutable arrays string arrays convert array to string data types convert java collections to scala multidimensional arrays (2D array) iterating over lists (foreach, for) iterating over maps
Using Option in Scala, Part 2: map and flatmap - Manning
WebJun 4, 2024 · DateTimeFormat import scala.util. Try object Test extends App { val sourceFormat = DateTimeFormat .forPattern ( "yyyy/MM/dd" ) val targetFormat = DateTimeFormat .forPattern ( "yyyy-MM-dd" ) def parse (str: String ): Option [ DateTime] = { Try ( DateTime .parse (str, sourceFormat)).toOption } val input = "2015/07/11" val … WebIn this example we are using the option class in scala to make use of getOrElse method. We have created two Integer variable for this to test. Code: object Main extends App{ // Your code here! // defining the variable using Option valy:Option[Int] = None valx:Option[Int] = Some(100) // using method getOrElse here for result on variable. scss2012s
OptionT - Typelevel
WebThere also exists a none method which can be used to create an OptionT [F,A], where the Option wrapped A type is actually a None: val greet: OptionT[Future,String] = OptionT.pure("Hola!") val greetAlt: OptionT[Future,String] = OptionT.some("Hi!") val failedGreet: OptionT[Future,String] = OptionT.none Beyond map WebAug 17, 2024 · Using Option in Scala, Part 2: map and flatmap From Get Programming with Scala by Daniela Sfregola This part of the article series delves into using map to transform an object contained in an Option and how to chain optional values together using flatMap. Take 37% off Get Programming with Scala. WebMay 11, 2024 · Let’s have a look. 3.1. Int Conversions. The first data type we’ll look at is Int. Converting an Int to a String is handled using the toString method: scala> val i: Int = 42 i: Int = 42 scala> i.toString res0: String = 42. Copy. To convert between a String and an Int there are two options. First, we can use the toInt method: scss2012c