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Josh Reed Schramm: January 2012

http://www.joshreedschramm.com/2012_01_01_archive.html

Thoughts and opinions on programming and technology. Sunday, January 15, 2012. Mapping (Multiple) Legacy Databases With Datamapper. We're starting in on a new project at work and it comes with some unique requirements (don't they all? To get things going so the rest of the team can take over and run with it I spent a couple days figuring out Datamapper. The ruby ORM and mapping a number of legacy data tables. Doesn't really focus on rails. No problem, take a look at the dm-rails gem. Overrides a number o...

scalaeyeforthejavaguy.blogspot.com

Scala Eye for the Java Guy: November 2015

http://scalaeyeforthejavaguy.blogspot.com/2015_11_01_archive.html

Scala Eye for the Java Guy. Wednesday, 18 November 2015. The Slow Boat to Folding. I'm back at the Scala-face, working my way through Functional Programming in Scala. By Paul Chiusano and Rúnar Bjarnason. I'm still taking things slowly. The current task was grokking folding. Why? As Miran Lipovača says in Learn You A Haskell. That's why folds are, along with maps and filters, one of the most useful types of functions in functional programming. For the authors own bold. Before we dive into the "how I grok...

joshreedschramm.com

Josh Reed Schramm: Codemash 2.0.1.2

http://www.joshreedschramm.com/2012/01/codemash-2012.html

Thoughts and opinions on programming and technology. Saturday, January 14, 2012. Codemash 2.0.1.2. 2012 marks my fourth year at Codemash. About this conference before but in short, if you don't go to Codemash you should. For your (or your companies) dollar it is the best value you will get. If you run a company you should send your people to Codemash, or sponsor. It, maybe even host a bacon bar. The first precompiler was a half day session that covered the Scala Koans. The Scala Koans. Also slimming down...

scalaeyeforthejavaguy.blogspot.com

Scala Eye for the Java Guy: Tracing, Step by Step

http://scalaeyeforthejavaguy.blogspot.com/2015/12/tracing-step-by-step.html

Scala Eye for the Java Guy. Thursday, 3 December 2015. Tracing, Step by Step. In this post I want to introduce the simple yet powerful technique of tracing. It's one I'm using more and more to help me get my head around the subtleties of recursion and in the process get a deeper understanding of the factors at play in this type of algorithm. We'll take as our first example a piece of code from my previous post. A call to a function called foldLeft. To begin, we next need the internals of this foldLeft.

scalaeyeforthejavaguy.blogspot.com

Scala Eye for the Java Guy: September 2013

http://scalaeyeforthejavaguy.blogspot.com/2013_09_01_archive.html

Scala Eye for the Java Guy. Monday, 30 September 2013. More on the Subtleties of Scala and the Uniform Access Principle. About Scala and the Uniform Access Principle. At that point I felt pretty smug that I’d noticed something clever. Well I didn’t realise everything, but luckily the Atomic Scala. Atom: “Uniform Access and Setters” was there to bring me fully up to speed. For this discussion, the relevant Scala contracts are:. Can be implemented as a val. Can be implemented as a def. S are immutable....

scalaeyeforthejavaguy.blogspot.com

Scala Eye for the Java Guy: Type Aliases for Functions - Wat?

http://scalaeyeforthejavaguy.blogspot.com/2015/12/type-aliases-for-functions-wat.html

Scala Eye for the Java Guy. Tuesday, 22 December 2015. Type Aliases for Functions - Wat? I'm still buried deep in Functional Programming Scala. It's an excellent book, but it does have a habit of occasionally introducing new topics a little out of the blue. This morning: Type Aliases. It means that when we have something like this:. And we then make a type alias like this:. We can do this:. Woah, what just happened there? As in " Braddock alias Thorne. You can now write DataTypeMap. Lets take this knowle...

scalaeyeforthejavaguy.blogspot.com

Scala Eye for the Java Guy: December 2015

http://scalaeyeforthejavaguy.blogspot.com/2015_12_01_archive.html

Scala Eye for the Java Guy. Tuesday, 22 December 2015. Type Aliases for Functions - Wat? I'm still buried deep in Functional Programming Scala. It's an excellent book, but it does have a habit of occasionally introducing new topics a little out of the blue. This morning: Type Aliases. It means that when we have something like this:. And we then make a type alias like this:. We can do this:. Woah, what just happened there? As in " Braddock alias Thorne. You can now write DataTypeMap. Lets take this knowle...

scalaeyeforthejavaguy.blogspot.com

Scala Eye for the Java Guy: Back on the Old for-Comprehensions Again – Filters and Guard Conditions

http://scalaeyeforthejavaguy.blogspot.com/2014/01/back-on-old-for-comprehensions-again.html

Scala Eye for the Java Guy. Tuesday, 7 January 2014. Back on the Old for-Comprehensions Again – Filters and Guard Conditions. NOTE: There's an update to this post, based on a Google comment from Chris Phelps. I’m back on. Comprehension construct, courtesy of chapter 2 of Cay Horstmann’s. 8220; Scala for the Impatient. For (i - 1 to 3; j - 1 to 3). Print( 10 * i j) " ") / Prints 11 12 13 21 22 23 31 32 33. From Scala for the Impatient. By Cay Horstmann, pp 20. For (i - 1 to 3; j - 1 to 3 if i! A bit of re...

scalaeyeforthejavaguy.blogspot.com

Scala Eye for the Java Guy: Weighing filter & map Against for’s guards and yield

http://scalaeyeforthejavaguy.blogspot.com/2014/01/weighing-filter-map-against-fors-guards.html

Scala Eye for the Java Guy. Wednesday, 8 January 2014. Weighing filter and map Against for’s guards and yield. On the surface, it seems that a combination of filter. Can achieve the same end as a for. Comprehension with judicious use of guards (e.g. if. Or to say the same thing in code:. Bfilter( % 2 = 0).map(2 * ). Takes the same inputs and produces the same outputs (with the same lack of side effects) as:. For (elem - b if (b % 2 = 0) yield 2 * elem. For it is from his book, Scala for the Impatient.