| //In library | |
| trait Event | |
| trait EventCombiner[A <: Event] { | |
| def initialValue: Int | |
| def combineEvents(value: Int, e2: A): Int | |
| } | |
| def foldEvents[A <: Event](list: Seq[A])(implicit C: EventCombiner[A]): Int = | |
| list.foldLeft(C.initialValue)(C.combineEvents) |
Copyright © 2016-2018 Fantasyland Institute of Learning. All rights reserved.
A function is a mapping from one set, called a domain, to another set, called the codomain. A function associates every element in the domain with exactly one element in the codomain. In Scala, both domain and codomain are types.
val square : Int => Int = x => x * x
| package fpmax | |
| import scala.util.Try | |
| import scala.io.StdIn.readLine | |
| object App0 { | |
| def main: Unit = { | |
| println("What is your name?") | |
| val name = readLine() |
| DDL | |
| DDL is short name of Data Definition Language, which deals with database schemas and descriptions, of how the data should reside in the database. | |
| CREATE – to create database and its objects like (table, index, views, store procedure, function and triggers) | |
| ALTER – alters the structure of the existing database | |
| DROP – delete objects from the database | |
| TRUNCATE – remove all records from a table, including all spaces allocated for the records are removed | |
| COMMENT – add comments to the data dictionary | |
| RENAME – rename an object |
| object Conversions { | |
| import cats._, implicits._, data.ValidatedNel | |
| import mouse._, string._, option._ | |
| import shapeless._, labelled._ | |
| private type Result[A] = ValidatedNel[ParseFailure, A] | |
| case class ParseFailure(error: String) | |
| trait Convert[V] { |
| val tryCatch = try { | |
| //Code here that might raise an exception | |
| throw new Exception | |
| } catch { | |
| case ex: Exception => | |
| //Code here for handle an exception | |
| } | |
| val tryMultipleCatch = try { | |
| //Code here that might raise an exception |
| sealed trait A | |
| case class B[Req, Res](r: Req, rs: Res) extends A | |
| case class C[Req](r: Req, errorCode: Int, errorMessage: String) extends A | |
| trait TypeA[Req, Res] { | |
| def success(t: Req, r: Res): Unit | |
| def error(t: Req): Unit | |
| } | |
| implicit val forString = new TypeA[String, String] { | |
| override def success(t: String, r: String): Unit = ??? |
| trait Item | |
| trait PlasticItem extends Item | |
| trait PlasticBottle extends PlasticItem | |
| trait PaperItem extends Item | |
| trait NewsPaper extends PaperItem |
| Html: | |
| <!DOCTYPE html> | |
| <html lang="en"> | |
| <head> | |
| <meta charset="UTF-8"> | |
| <title>Title</title> | |
| <script src="https://code.jquery.com/jquery-3.2.1.min.js"></script> | |
| <script type="text/javascript"> | |
| Office = { | |
| initialize: function (reason) { |
| { | |
| type: 'devs.Model', | |
| inPorts: [], | |
| outPorts: [], | |
| size: { | |
| width: 80, | |
| height: 80 | |
| }, | |
| attrs: { |