Friday, July 12, 2013

[ruby] Calling :methods on BasicObject

So, I just learnt a couple of days ago that you could pass in false to  :methods , and it'll filters out the inherited methods and return an array of only the methods that are defined in the class.
And as I spent time playing with it, I thought I'll check how BasicObject would respond to, if I called methods(false) on it.

My assumption was that BasicObject would possibly be the only class which would return back the same array for :methods(true) and :methods(false) - since it doesn't inherit from anything.

So here's what I did

BasicObject.methods(false) # => []

An empty array? Given that BasicObject is the root of Ruby's object hierarchy, it didn't make sense that BasicObject could respond differently for :methods(true) and :methods(false) - So where were those methods coming from?

After a few mins of trying to Google, I reached out to [Chew Choon Keat]( and he figured the obvious problem here. It wasn't BasicObject responding to the call - The receiver was instead a Class object.

:instance_methods seems to be respond like how I expected it to though.

Oh, and :methods is defined in the Kernel module, that gets included into Object class.


Thursday, July 11, 2013

RVM install fails when you have developer preview of xcode5 installed

I was just installing ruby-2.0.0-p247 on my machine (high time, I know!), and rvm kept failing silently.  It would download ruby, extract, proceed till configure, and failed at the installation phase.

So I ran

rvm install --debug ruby-2.0.0-p247 

And this exposed the location of the installation log file.  

The log, showed that the failure was with a missing path within - 

Apple's Xcode5 developer preview app 1 & 2 were just named, but with the Developer preview 3, the app's called - And for some reason rvm's install scripts were looking for a path inside Strange.

Anyway, I then proceeded to symlink as, did a rvm install again, and this time, installation went smooth.

Blogging this, just in case someone else runs into the same issue. I can't be the only one who's so late to the party? 

Monday, March 11, 2013

Learn Ruby on Rails in Bahasa Indonesia

Nia Mutiara, a dear friend and colleague of mine has started writing Ruby on Rails tutorials in Bahasa Indonesia, (and has created this try.ruby like application too!), to help her local developer community adapt Ruby on Rails.

Here's an attempt to send her some hits. If you have friends in Indonesia contemplating learning programming, send them over to her page!