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scala-logo

Scala: Missing OO and FP bridge

Scala blends functional and object-oriented programming in many nice ways. You can use both FP an OO-like constructs whichever fits the current problem better. But there’s always room for improvement! Here’s one thing I think ...
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FreeChart with Groovy and Apache POI

The point of this article is to show you how to parse data from an Excel spreadsheet that looks like this:and turn it into a series of graphs that look like this:Recently I was looking for an opportunity to get some practice ...
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Mahout and Scalding for poker collusion detection

When I’ve been reading a very bright book on Mahout, Mahout In Action (which is a great hands-in intro to machine learning, as well), one of the examples has caught my attention. Authors of the book where using well-known K-mean ...
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Groovy DSL – A Simple Example

Domain Specific Languages (DSLs) have become a valuable part of the Groovy idiom. DSLs are used in native Groovy builders, Grails and GORM, and testing frameworks. To a developer, DSLs are consumable and understandable, which mak ...
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Custom Ordering Scala TreeMap

How do you get custom ordering in a Scala TreeMap? Well this puzzled me for a while. The answer lies in the world of implicits and receiver type converters. In a nut shell, a scala.collection.immutable.TreeMap i ...
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Grails Custom AuthenticationProvider

In order to tighten up security in our new Grails app I went about implementing the Spring Security Plugin. Getting it up and running with a standard username/password scenario was simple, as that is all wired up automagically by ...
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GitHub Social Graphs with Groovy and GraphViz

The Goal Using the GitHub API, Groovy and GraphViz to determine, interpret and render a graph of the relationships between GitHub users based on the watchers of their repositories. The end result can look something like this. The ...
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Power with control: Scala control structures and abstractions

So ramping up with the Scala 101 series, I thought now is an appropriate juncture to introduce control structures in Scala. To a certain extent, working with the Scala language presents a vista wherein the developer is afforded ...
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ScaTDD: Casting an eye over three major Test frameworks in Scala

Testing has traditionally been the gateway process for Scala development at a number of Java shops looking to evolve their tech stack with minimal disruption or committment. This posts hopes to cover three of the main tes ...
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Using Groovy scriptlets inside a *.docx document

Introduction One of my recent projects required automated generation of contracts for customers. Contract is a legal document of about 10 pages length. One contract form can be applied for many customers so the document is a templ ...
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