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Intro

This James script asks the user for the origin and destination stations of the MLO network and reports to him how much time he has before his train passes by.

MLO stands for the Metro Ligero Oeste, the tramway network of the west Madrid area

I have to admit it is not specially useful since recognition of spanish names is not the strongest points of the Mac speech recognition (my metro stop is called Somosaguas Sur and it is barely impossible for James to recognize it). Maybe I could translate the names into english (actually that could be fun! somosaguas becomes wearewaters XDDD)

Usage

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short_arel

What is this about?

Do you use ActiveRecord? Tired of writing in console all those verbose Arel methods? Well short_arel is for you!

The idea is to reduce to the minimum the numbers of characters you have to type to perform ActiveRecord queries. short arel just aliases long-named methods with its short version, so instead of having to write:

Post.where(:public => true).includes(:comments).order('edited_at ASC')

you could write

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Nestable, sortable and dragable categories:

In the project I'm working on we wanted to have a Category model which we wanted to be nestable. But we also liked the user to have a draggable interface to manage and rearrange the order of his categories. So we chose awesome_nested_set for the model and jQuery.nestedSortable for the UI.

It took me some time to arrange things to work properly so I wanted to share my work in case it helps anybody.

Before beginning

you might want to take a look at a demo app

1. go to: http://awesomenestedsortable.heroku.com/groups/
2. click in show of any group

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A keyboard shortcut to run tests with watchr

When developing in rails I use watchr to run the tests each time a file is saved, but lots of times I find my self adding a whitespace or a newline and saving just to trigger watchr and run the tests.

I wanted to have is a simple keyboard shortcut (like F15) to tell watchr to run the last spec, and mpartel (thx! : ) gave me an idea on how to do it, so here it is:

Dependencies

Obviously you need watchr, but we're also going to need pgrep that will help us find out the pid of the watchr process. So go ahead and do

sudo port install proctools

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###
------> HTTPClientWithCache <------

This class is a wrapper around the standard Titanium.Network.HTTPClient(), but it adds a
few nice features:

  * A cache backed by a SQLite database. All HTTPClientWithCache instances use the same database table, with
    the primary cache key being a hash of the full URL (and any data parameters in a POST)
  * The cache is automatically pruned before each query
  * A retry mechanism, so that you can retry a particular query a number of times before failing. 

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<a href="javascript:(function(){_my_script=document.createElement('SCRIPT');_my_script.type='text/javascript';_my_script.src='https://raw.github.com/gist/1498854/62cca0c124580741a3572a751d2f2569413ee37f/full_cke.js';document.getElementsByTagName('head')[0].appendChild(_my_script);})();">Full_CKE</a>

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With this you can do

Restaurant.all_with_photo #=> will return all the restaurants with a photo
User.first.photo_width #=> 65px

Restaurant.first.photo_url #=> "http://......"

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Latency Comparison Numbers                      Time     Light Distance    Approximate Light Distance
--------------------------                      ----     --------------    --------------------------
L1 cache reference                            0.5 ns             0.15 m    Diagonal across your smartphone
Branch mispredict                             5   ns             1.5  m    Height of Natalie Portman
L2 cache reference                            7   ns             2.1  m    Height of Shaq   
Mutex lock/unlock                            25   ns             7.5  m    Height of a school flag pole
Main memory reference                       100   ns            30    m    Half a Manhattan city block (North/South)
Compress 1K bytes with Zippy              3,000   ns           900    m    Width of Central Park
Send 1K bytes over 1 Gbps network        10,000   ns         3,000    m    Width of Manhattan
Read 4K randomly from SSD*              150,000   ns        45,000    m    NYC to Hempstead on Long Island

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Latency Comparison Numbers
--------------------------
L1 cache reference                            0.5 ns
Branch mispredict                             5   ns
L2 cache reference                            7   ns             14x L1 cache
Mutex lock/unlock                            25   ns
Main memory reference                       100   ns             20x L2 cache, 200x L1 cache
Compress 1K bytes with Zippy              3,000   ns
Send 1K bytes over 1 Gbps network        10,000   ns    0.01 ms
Read 4K randomly from SSD*              150,000   ns    0.15 ms

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Los comentarios

Todos los lenguajes de programación admiten una cosa que se llama comentarios

Cualquier linea que escribes en un archivo de ruby (por ejemplo) se ejecutará antes o después salvo si se trata de un comentario

En ruby los comentarios empieza con el caracter especial #, un ejemplo:

#esto es un comentario
puts "hola santi"