July 17, 2013

Version Control Systems

A while ago, Fábio Akita from AkitaOnRails.com launched the campaign “Beginners’s Friday” intended to help the new generation of developers coming today. I’m totally buying into this idea and this is the first post I’m doing in that direction with version control systems. Version Control Systems What is a version control system? In the context of software development, a version control, revision control or source control system is a software designed to control changes to computer programs (as well as documents, sites and virtually whatever you want).

April 11, 2013

DevFestW Campinas

What is DevFestW? Quoting the main site: DevFestW is a series of community-led events that have technical sessions centered around Google developer technologies and platforms. DevFestW is focused specifically on bringing together women in the local developer community to teach, learn, code and network. DevFestW Campinas DevFestWs were supposed to be held in March, but we had to postpone ours to yesterday (April 10th) because of some problems with location. Finally, we got a lot of support from Dextraining to promote the event, from food to location, to video cameras to record the event, so we decided to do it even so late.

March 1, 2013

Waza Opening

Waza is an event promoted by Heroku, a PaaS company. In Ruby language world there is this tendency to name things after Japanese words (Ruby itself came from Japan, thanks to Matsumoto Yukihiro, a.k.a. Matz), although I have no idea if this influenced Heroku somehow. Heroku itself I don’t think it’s a Japanese word (at least I couldn’t find it in any dictionary I looked at). On the other hand, waza is a Japanese word meanining technique, so it makes perfect sense to name an event focused on technical knowledge after this word.

December 2, 2012

Thoughts on DevFest Brasil

Last Friday I went to DevFest Brasil (in Portuguese). Since Google won’t promote Google Developer Day anymore, the Google Developer Groups (former GTUG, Google Technology User Groups) are promoting DevFest. So, these events, instead of being backed up by a big company, are from community to community. I recognize the hassle that is promoting these, and I think the people from GDG-SP (São Paulo), GDG-BH (Belo Horizonte) and GDG-GO (Goiás) did a great job nonetheless.

November 30, 2012

My talk from DevFest Brasil is online

I just uploaded the slides of my talk in DevFest Brasil. See link on this page (if you’re on desktop, it should be on the right, if you’re on a smartphone, it’s at the bottom). It’s exactly as I presented. Later today or tomorrow I’ll add some presenter notes or some screenshots of the hands-on part. Edit: just see the talks page

November 24, 2012

I’ll talk in DevFest Brasil

This year we won’t have Google Developer Day. Instead, Google Developer Groups are organizing their own events called DevFest. These are pretty much like Google Developer Day with some extras. For instance, in GDDs, we didn’t have codelabs with hands on, just 1h (approx) long talks about a variety of topics Google related. One other thing that changed are the speakers. On GDD, all were Google Employees or invited by Google.

November 14, 2012

Evernote Hackathon Brazil

Last weekend (Nov 10–11), Evernote held the second edition of Evernote Hackathon Brazil. It was my first 24H hackathon and it was very exciting. I had participated in two hackathons before, but the doors were shut down at night. The trip The hackathon was held in São Paulo city at Academia Wayra, a startup incubator located in a very cool building with a nice view. It was the first time Pinheiros river looked nice.

November 8, 2012

Migrating and pruning repos

Recently I had to put a folder from my app repository into a separate repository on its own. The easiest way was just git init a new repo, copy the directory and git commit it, but I would lose all history up until the move. After fiddling with git and Stack Overflow, I found the solution. Suppose the structure is like this: All-in-one repo: * server * code.go * code2.go * iOS * code.

November 6, 2012

Replacing in bash without sed

Bash has built-in substitution. For simple tasks it’s easier than piping through sed: text="hello world" echo ${text/hello/ohayou} # prints ohayou world Be aware that just the first word is changed: text="hello world hello" echo ${text/hello/ohayou} # prints ohayou world hello To change all instances of a world, prepend the search pattern with another slash: text="hello world hello" echo ${text//hello/ohayou} # prints ohayou world ohayou Notice there are two slashes before hello, one as the separator and one prepending it.

April 3, 2010

Eigenclass

In Ruby, there’s the concept of eigenclasses, or singleton classes. These are classes implicitly defined when attaching methods to a single instance. From Wikipedia: Ruby is object-oriented: every data type is an object, including classes and types which many other languages designate as primitives (such as integers, booleans, and “nil”). Every function is a method. Named values (variables) always designate references to objects, not the objects themselves. Ruby supports inheritance with dynamic dispatch, mixins and singleton methods (belonging to, and defined for, a single instance rather than being defined on the class).