bcardiff

Blocking and non-blocking channel actions

Channel#receive vs Channel#receive? differs on their behavior for closed channels. Using them directly is always blocking.

Performing an operation over a closed and closing the channel during the operation must behave in the same way.

Channel#receive

bryansray

class BaseSort
  def less(v : Comparable, w : Comparable) : Bool
    return v < w
  end

  def exchange(a : Array(Comparable), i : Int, j : Int)
    t = a[i]
    a[i] = a[j]
    a[j] = t
  end

nguyentamvinhlong

#Heroku, Ruby on Rails and PhantomJS

In this post, I’m going to show you how to modify an existing Ruby on Rails app running on Heroku’s Cedar stack to use PhantomJS for screen scraping. If you’ve never heard of PhantomJS, it’s a command-line WebKit-based browser (that supports JavaScript, cookies, etc.).

Let’s get started. This is a high-level overview of the required steps:

• Modify your app to use multiple Heroku buildpacks.
• Extend your app to use both the Ruby as well as the PhantomJS buildpacks.
• Confirm that everything worked.

gbuesing

UPDATE a fork of this gist has been used as a starting point for a community-maintained "awesome" list: machine-learning-with-ruby Please look here for the most up-to-date info!

Resources for Machine Learning in Ruby

Gems

• liblinear-ruby: Ruby interface to LIBLINEAR using SWIG

cou929

function retry(isDone, next) {
    var current_trial = 0, max_retry = 50, interval = 10, is_timeout = false;
    var id = window.setInterval(
        function() {
            if (isDone()) {
                window.clearInterval(id);
                next(is_timeout);
            }
            if (current_trial++ > max_retry) {
                window.clearInterval(id);

MohamedAlaa

tmux shortcuts & cheatsheet

start new:

tmux

start new with session name:

tmux new -s myname

rkumar

#!/usr/bin/env ruby -w
## Using ruby's standard OptionParser to get subcommand's in command line arguments
## Note you cannot do: opt.rb help command
## other options are commander, main, GLI, trollop...

# run it as
# ruby opt.rb --help
# ruby opt.rb foo --help
# ruby opt.rb foo -q
# etc