Sign In Start Free Trial
Account

Add to playlist

Create a Playlist

Modal Close icon
You need to login to use this feature.
  • Professional Scala
  • Toc
  • feedback
Professional Scala

Professional Scala

By : Hartmann, Shevchenko
4.2 (13)
close
Professional Scala

Professional Scala

4.2 (13)
By: Hartmann, Shevchenko

Overview of this book

This book teaches you how to build and contribute to Scala programs, recognizing common patterns and techniques used with the language. You’ll learn how to write concise, functional code with Scala. After an introduction to core concepts, syntax, and writing example applications with scalac, you’ll learn about the Scala Collections API and how the language handles type safety via static types out-of-the-box. You’ll then learn about advanced functional programming patterns, and how you can write your own Domain Specific Languages (DSLs). By the end of the book, you’ll be equipped with the skills you need to successfully build smart, efficient applications in Scala that can be compiled to the JVM.
Table of Contents (10 chapters)
close

Implicit Parameters and Implicit Conversions


Scala has implicit parameters and conversions. When used in a controlled manner, implicit can make working with external libraries more pleasant, and also enable some elegant patterns that you can use in your own code.

Implicit Parameters

Implicit parameters are a way to make the compiler automatically fill in some arguments when a method call misses them for some (or all) of the (implicit) parameters. The compiler will look for definitions labelled implicit of the required types. For example, suppose you want to write a program that prompts the user for some action, after displaying a message. You want to customize both the message and the string that appear on the prompt. We can assume that the prompt string will have a more default value than the message, so one way to implement it using implicit parameters is like the following:

case class Prompt(value: String)
def message(msg: String)(implicit prompt: Prompt) = {
  println(msg)
  println(s...
bookmark search playlist font-size

Change the font size

margin-width

Change margin width

day-mode

Change background colour

Close icon Search
Country selected

Close icon Your notes and bookmarks

Delete Bookmark

Modal Close icon
Are you sure you want to delete it?
Cancel
Yes, Delete