| // Start Scala | |
| // :paste the following: | |
| object Currencies { | |
| sealed trait Rate { | |
| def to(currency: Rate, amount: Double): Money | |
| } |
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
I hereby claim:
To claim this, I am signing this object:
| trait A { | |
| def action() = println("a") | |
| } | |
| trait B extends A { | |
| override def action() = println("b") | |
| } | |
| trait C { | |
| def action() = println("c") |
| /* | |
| * Copyright © 2012 Typesafe, Inc. All rights reserved. | |
| */ | |
| package com.typesafe.training.scalatrain | |
| object TestData { | |
| val munich = Station("Munich") |
| def connections(from: Station, to: Station, departureTime: Time): Set[Seq[Hop]] = { | |
| require(from != to) | |
| def connections(from: Station, departureTime: Time, visitedStations: Set[Station]): Set[Seq[Hop]] = | |
| { | |
| val hopsFrom: Set[Hop] = hops.getOrElse(from, Set[Hop]()) | |
| hopsFrom.filter(hop => hop.departureTime >= departureTime) | |
| .filterNot(hop => visitedStations.contains(hop.to)) | |
| .flatMap(hop => |
| ➜ ~ brew --config | |
| HOMEBREW_VERSION: 0.9.5 | |
| ORIGIN: https://github.com/Homebrew/homebrew.git | |
| HEAD: b984d3e996321207b35af391d5f1f6ef2aaa1774 | |
| HOMEBREW_PREFIX: /usr/local | |
| HOMEBREW_CELLAR: /usr/local/Cellar | |
| CPU: 8-core 64-bit sandybridge | |
| OS X: 10.9.2-x86_64 |