Scala in Action by Nilanjan Raychaudhuri

By Nilanjan Raychaudhuri

Summary

Scala in Action is a finished educational that introduces Scala via transparent factors and diverse hands-on examples. simply because Scala is a wealthy and deep language, it may be formidable to take in all of the new innovations immediately. This ebook takes a "how-to" process, explaining language recommendations as you discover universal programming demanding situations that you just face on your day by day work.

About the Technology

Scala runs at the JVM and combines object-orientation with sensible programming. It's designed to supply succinct, type-safe code, that is the most important for company purposes. Scala implements Actor-based concurrency during the impressive Akka framework, so that you can keep away from Java's messy threading whereas interacting seamlessly with Java.

About this Book

Scala in Action is a complete educational that introduces the language via transparent motives and diverse hands-on examples. It takes a "how to" technique, explaining language thoughts as you discover usual programming projects. You'll take on concurrent programming in Akka, discover ways to paintings with Scala and Spring, and the way to construct DSLs and different productiveness instruments. You'll examine either the language and the way to take advantage of it.

Experience with Java is beneficial yet no longer required. Ruby and Python programmers also will locate this publication accessible.

What's Inside
• A Scala tutorial
• tips on how to use Java and Scala open resource libraries
• easy methods to use SBT
• Test-driven development
• Debugging
• up-to-date for Scala 2.10

Purchase of the print ebook features a unfastened publication in PDF, Kindle, and ePub codecs from Manning Publications.

About the Author

Nilanjan Raychaudhuri is a talented developer, speaker, and an avid polyglot programmer who works with Scala on construction systems.

Table of Contents
<ol><h5>PART 1 SCALA: THE BASICS</h5> • Why Scala?
• Getting started

• OOP in Scala

• enjoying practical information structures

• useful programming
<h5>PART 2 operating WITH SCALA</h5> • construction internet purposes in practical style

• Connecting to a database

• construction scalable and extensible components

• Concurrency programming in Scala

• development self assurance with testing
<h5>PART three complicated STEPS</h5> • Interoperability among Scala and Java
• Scalable and dispensed functions utilizing Akka
</ol>

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Sample text

Grouping is controlled by parameters passed to your view, not by the Reduce function itself. CouchDB has three built-in Reduce functions: _count, _sum, and _stats (shown in Table 2-5). In most situations, you will want to use one of these built-in Reduce functions. You can write your own custom Reduce functions, but you should rarely need to. Both the _sum and _stats built-in Reduce functions will only reduce sets of numbers. The _count function will count arbitrary values, including null values.

We will call this the releases view and add it to our _design/default design document. In this new view, we will map book documents to key/value pairs of release dates and number of pages. Instead of a string, the release date will be a JSON array containing the date’s year, month, and day. We will do this by using the split method of JavaScript’s String object on each book document’s released field. , ["2007","05","08"]. Group levels require JSON arrays to group on, and they work best when the array elements are ordered from least specific to most specific.

Table 4-8. Rows from the formats view, limited to five and filtered by start key and document ID key id value "Safari Books Online" "978-0-596-15589-6" 272 "Safari Books Online" "978-0-596-52926-0" 448 Reversing Output Let’s reverse the output of our book titles view: curl -X GET http://localhost:5984/books/_design/default/_view/titles -G \ -d reduce=false \ -d descending=true The response: { "total_rows":3, "offset":0, "rows":[ { "id":"978-0-596-52926-0", "key":"RESTful Web Services", "value":448 }, { "id":"978-1-565-92580-9", "key":"DocBook: The Definitive Guide", Limiting, Skipping, and Reversing Results | 49 }, { } "value":648 "id":"978-0-596-15589-6", "key":"CouchDB: The Definitive Guide", "value":272 ] } See Table 4-9 for the rows in tabular format.

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Scala in Action by Nilanjan Raychaudhuri
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