| 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 |
| 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] { |
| 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 |
| package fpmax | |
| import scala.util.Try | |
| import scala.io.StdIn.readLine | |
| object App0 { | |
| def main: Unit = { | |
| println("What is your name?") | |
| val name = readLine() |
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
| //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) |