Copyright © 2017 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
| val suits = List("H", "D", "C", "S") | |
| val values = List("A", "2", "3", "4", "5", "6", "7", "8", "9", "10", "J", "Q", "K") | |
| val cards = for (s <- suits; v <- values) yield v + s | |
| def iteration(): Int = { | |
| val shuffledCards = scala.util.Random.shuffle(cards) | |
| val positions = shuffledCards.zipWithIndex.filter(cardWithIdx => cardWithIdx._1 == "QC" || cardWithIdx._1 == "QS").map(_._2 + 1) | |
| positions.last | |
| } |
| import java.util.Base64 | |
| import java.io.PrintWriter | |
| object scratch { | |
| val root = scala.xml.XML.loadFile("""C:\temp\030415022143-030415025143.mpr""") | |
| val names = (root \\ "FilenameCDATA").toList | |
| val base64Names = names.map(_.text) | |
| val decoder = Base64.getDecoder() | |
| val asciiNames = base64Names.map(b64 => new String(decoder.decode(b64))) |
| /* | |
| http://richardwiseman.wordpress.com/2014/08/04/answer-to-the-friday-puzzle-269/ | |
| OK, onto the puzzle. Can you create a 10-digit number, | |
| where the first digit is how many zeros in the number, | |
| the second digit is how many 1s in the number etc | |
| until the tenth digit which is how many 9s in the number. | |
| */ | |
| def selfReferential(number:String) : Boolean = { | |
| val numsWithIdx=number.zipWithIndex |
| /* | |
| http://richardwiseman.wordpress.com/2014/08/04/answer-to-the-friday-puzzle-269/ | |
| OK, onto the puzzle. Can you create a 10-digit number, | |
| where the first digit is how many zeros in the number, | |
| the second digit is how many 1s in the number etc | |
| until the tenth digit which is how many 9s in the number. | |
| */ | |
| def digitSum(i:Long) = i.toString.toList.map(_.asDigit).sum | |