Will we only create and use dynamic languages in the future?

Since I’ve playing with some dynamic languages (Ruby and Clojure), I have been thinking about why would anybody create a new static typed language?! And I didn’t get the answer.

I started programming in Visual Basic and I taste its roots, which are almost all full of procedure commands (bunch of do, goto and end), then I moved to C#, sharper it changes the end’s for }’s and give us a little more power based on some premises: we can treat two different things in the same way, polymorphism. The last static language, but not the least, I used (and I use it) Java, abusing of his new way of treating a set of things equality, the interfaces and using its “powers” on reflections.

Although when I started to use Ruby I saw that I could treat a group of things equality without doing any extra work. I still need to code models and composed types, even though we can create or change them dynamically using “real power” of metaprogramming.

When I start to study and apply the Clojure and its principles, my first reaction was the rejection, how can I go on without my formal objects, how can I design software without a model in the head and so on. I wasn’t thinking about how actually I do software, currently I use TDD to design software and I don’t think what models I need to have, I do think in terms of “what I want”. At minimum, Clojure make me think about, do we really need object to design software?! .  A three days ago I saw an amazing video about similar thoughts: Some thoughts on Ruby after 18 months of Clojure.

Summarising: With my limited knowledge of theses languages, let’s suppose we use a function (which we don’t have source code) and we want to do something before that function is executed (intercept) using: VB I’ll need to check every single piece of code which we call this function and call another one, in Java we can use a AOP framework, in Ruby we can use the spells of metaprogramming. It seems that some frameworks, patterns and extra work aren’t needed more because of this dynamic language evolution.

My conclusions using dynamic languages (Clojure/Ruby) for now it’s: I write less code and reuse them more easy, so I don’t see any reason to create/use a new static typed language, would you see any motivation to do that?

PS: When I use C# (.Net Framework 1.3 – 2.0) it was not so super cool as today.

Advertisements

Put the bricks together on gnu linux

Why Linux?

It is easy, flexible, very secure, updated, “free”, open source… and the list goes on however what makes me more happy on this little world *unix it is its flexibility.

The power

Let start with a simple command, like ps, which can show you a list of current process and its details.

ps -aux

Now, I would like to just shows the output lines which has usr on it. To do that I will use the output of ps -aux command as input to grep filter the data. On linux you can pass the output of a command to another by using a pipe. So we can redirect the last output as input to another one.

ps -aux | grep usr

Now we have the output from ps filtered by only lines which contains ‘usr’. But what if want only the process id’s. There is a program for that too, the cut.

ps -aux | grep usr | cut -d " " -f 8

This program cut is simple creating fields (-f) delimited (-d) by a space (” “) and I ask the program to pick the field 8, which is the process ids. But if you notice there is some lines without number. The next step is remove this lines without values. We can do it by using sed program.

ps -aux | grep usr | cut -d " " -f 8 | sed '/^$/d'

Now our output has only lines with numbers, sed program receives a simple regex and says delete this pattern. Nice but I just need those numbers ending with 2. We can grep again.

ps -aux | grep usr | cut -d " " -f 8 | sed '/^$/d' | grep $2

I also want to sum all this numbers and show on the screen the result. To achieve that we are gonna use awk program.

ps -aux | grep usr | cut -d " " -f 8 | sed '/^$/d' | grep $2 | awk '{ sum += $1; print "+" $1} END {print "_____" ; print sum}'

The first code (surrounded by brackets) will create a variable called sum and it also prints plus and each first argument passed to it. This first block will be called for every line we pass (processed by all the programs we did it) and it follows by END that will print a line and finally prints the sum of all this stuffs.

+1692
+1712
+1732
+1752
+1762
+1962
+2062
_____
12674

You can use programs connect them produce output that only one program can not do. PS: I know I could too all this with less programs/commands but the intend here was not teach linux/GNU programs it was show you how powerful can be linux.

Bonus round

You can put this output to a file just using the redirect to a file. ( > or >> to append)

ps -aux | grep usr | cut -d " " -f 8 | sed '/^$/d' | grep $2 | awk '{ sum += $1; print "+" $1} END {print "_____" ; print sum}' > file.txt

Thoughtworks Brazil – POA

Thoughtworks logo
Now it’s official, I’m working on ThoughtWorks – a global IT consultancy which focuses on agile software development, has contributed to a range of open source products, including CruiseControl, NUnit 2.0, and Selenium. My last work was at Sefaz-GO, a government agency which mainly takes care of state tax system. I left too many friends there but this opportunity cames to me and I need to move on, I mean, literally move, from GYN to POA, that’s the worst part to me. Soon I’ll posting more about this new position in my career. Ohhh and like any new thing on life, I have my hopes: increase my knowledge, to know more cultures, apply agile with some of the creators and learn with amazing twkrs. And all this started around four months ago. I’m happy! 😀

For those are feeling lost please read thoughtworks at Brazil  and remember we’re continue hiring people.

ThoughtWorks Brazilian hiring process

The hiring process

My intend here is to explain my personal view of the hiring process (which I was submitted) of Brazilian ThoughtWorks. In fact the ThoughtWorks hiring process is already explained, see a brief view of it:

“Hiring is our signature process, so as you might expect, we’ve thought hard about how we access your suitability for a career with us. We believe we’ve created a process that is fun, that shows you what being a ThoughtWorker is all about and challenges your abilities. Many hiring processes consist of a couple of interviews and perhaps a chance to meet your new boss. We reject that. We want to find out what work environment suits you, what you value and how you do your job, so we don’t just sit and ask you questions. We get you to show us what you can do.”

The steps (Dev role)

The TW talent scout sent me a message telling me about the open positions at TW (Porto Alegre) and then I answer her asking how to apply, she informed everything I need to do. Then I’ve applied to dev position (03/20/2011) and the First Step: a informal phone interview, that first interview it’s very easy and weightless 🙂 just to know you a little bit. The Informal Phone Interview is designed to help tw get to know each other beyond CVs and web pages.

Second Step was the code submission: they will send you two problems, you must choose only one, to solve. On this part they are trying to access a number of things, these include the design aspect of your solution, but mostly we are looking for good coding practices and your object-oriented programming skills. Good tip here is: use your primary programming language (I do love and want to learn ruby but Java was my main tool that moment).

Then if you have passed on this phase you will be on Third Step: the tech phone interview that consists of one ThoughtWorker interviewing you more technically, in my case Rodrigo Wolschick (A.K.A. Patrola) did the interview and despite his nickname he was fine with me.

So after that you will be on Fourth Step: Office Interview (here the real fun will start), they ask me to schedule two days to be at office. At the office you will pass through several interviews (culture values, programming pairing…) and logical assessments, I can tell you it’s very tiring BUT IT’S SURPRISINGLY FUN. After this long process I started to work at June 21.

PS: I should write this before I’ve posted ThoughtWorks POA.

Ohh, one last note we’re hiring, so if you are interested :

Open positions at ThoughtWorks Brazil