I always wanted to write a post with some sort of help for those curious about the fascinating world of Arduino. Here it is. Finally my getting started guide.
Please, stay only if…
A real disclaimer, arduino is a time sucker, same level as:
Be careful.
I always wanted to write a post with some sort of help for those curious about the fascinating world of Arduino. Here it is. Finally my getting started guide.
Please, stay only if…
A real disclaimer, arduino is a time sucker, same level as:
Be careful.
Enumerations for Scala
“Let the compiler help you!!!”
readMode: String)This is a ultra-short post on JVM debugging tools. Did you get an OutOfMemoryError and have no idea how to proceed? This post is for you.
I’d like to start with a dummy application as example. We will make it run and analyse its memory heap. With the tools I will introduce you can analyse many other indicators, but the procedure to get to that point hast the same initial steps. Once in the tool you can explore by yourself.
This application simply will create a huge amount of UUID instances and keep them in memory for a while. If we analyse it correctly, we should see them somewhere in our memory heap. So let’s get started.
Put in Main.scala the following:
You’re eligible if you use:
And if at least one of the below is true:
git log --oneline \
--decorate --all \
--graph
bash, htop)>_
Presentations are great. Blogs too. Which one should do I dedicate my time to?
No need to choose, you can do both at once!
In this special post/presentation, I will give you an example with sources on how to build your own blog posts, and generate both:
from a single markdown file.
Presentations are great. Blogs too. Which one should do I dedicate my time to?
No need to choose, you can do both at once!
In this special post/presentation, I will give you an example with sources on how to build your own blog posts, and generate both:
from a single markdown file.
The variance in Scala aims to provide flexibility to the inheritance on parametric types.
Two examples where it helps are:
List[Dog] a subtype of List[Animal]Animal=>Boolean as a function Dog=>BooleanThe variance in Scala aims to provide flexibility to the inheritance on parametric types.
Two examples where it helps are:
List[Dog] a subtype of List[Animal]Animal=>Boolean as a function Dog=>BooleanThis post is about:
It will help you better understand concepts like:
OutOfMemoryErrorPermGenheap memoryThis post is about:
It will help you better understand concepts like:
OutOfMemoryErrorPermGenheap memoryCoding consciously and the use of code reviews are of great importance when it comes to writing clean and efficient code. Sometimes however, I feel like I need stronger reasons to go one way or another, specially when I don’t really know what is happening under the JVM hood.
A benchmark helps describing the current status of your implementation. It provides awareness, helps deciding if improvement is worth the investment, and finally helps measuring the improvement of your change (if any).
Unfortunately getting such number is not so easy, but fortunately there are good tools to do it correctly. Keep reading if you’re interested.
Sorting requirements are present in the vast majority of data processing applications. As Scala provides very good tools for addressing them, I thought it would be interesting to dive a bit into them to improve our code.
Here are some of the patterns that you may feel tempted to use, and what I consider is a better alternative. Leave a comment if you have even a better one!
Kryo serialization is one of the fastest on-JVM serialization libraries, and it is certainly the most popular in the Spark world.
To get the most out of this algorithm you must register the few classes that will have to be serialized. This will help to decrease the size of serialized objects, as their serialization will be tailor-made optimized by Kryo.
Registering your classes with Kryo in Spark is done this way:
In short, a partial function is simply a mathematical function f: X->Y that is not defined for some elements in the domain X.
The typical example is f: 1/x , not defined when x = 0.
It is a Scala trait that allows to express a partial function. For instance…
Subscribe via RSS