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# Count occurrences
# FIND DESCRIPTION BELOW THE CODE

def  countDuplicates array
  puts array.select{|x| array.count(x) > 1}
            .each_with_object(Hash.new(0)) {|num,counts| counts[num] += 1}
            .each_value.to_a.uniq
end
# Usage 
# countDuplicates([1,3,1,4,5,6,3,2,4,4,6,7,6,7,8,8,9,7,7]);

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# Fizz-Buzz Ruby
# FIND DESCRIPTION BELOW THE CODE

puts "Enter a number (integer): "
n = gets.chomp.to_i
i = 1
n.times do
    if i%3 == 0 || i%5 ==0
        if i%3 == 0 && i%5 == 0
            puts "FizzBuzz"

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/* A function to return class for each Bootstrap navbar elements */
// FIND DESCRIPTION BELOW THE CODE

$(function() {
  $( "#navbar" ).click(function() {
    $( "ul li" ).each(function( index ) {
      var class_name = $( this ).attr("class");
      if( class_name === "active" || class_name === "inactive"){
        console.log( index + ": " + $( this ).attr("class") );
      }

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How to install PhantomJS on Ubuntu

Version: 2.1.1

Platform: x86_64

First, install or update to the latest system software.

sudo apt-get update
sudo apt-get install build-essential chrpath libssl-dev libxft-dev

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Multiple SSH Keys settings for different github account

create different public key

create different ssh key according the article Mac Set-Up Git

$ ssh-keygen -t rsa -C "[email protected]"

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tmux shortcuts & cheatsheet

start new:

tmux

start new with session name:

tmux new -s myname

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Download videos from egghead

1. Install the React Developer Tools Chrome Extension.

2. Go to the egghead website, i.e. Getting Started with Redux

3. Click View -> Developer -> Javascript Console, then the React tab, then

   1. Click on <NextUpLessonList ...> tag.
   2. If the first option is not available then find and click on a <_ listType="course" list={... > tag or enter lessons in a search field and look for <inject-t-with-lessonScreenStore lessons=[{...}, {...}, {...}, ...] in results list (and then click on it).

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Set of terminal directives for adding a correct screen resolution for a connected Samsung SyncMaster 2233BW on Ubuntu 16.04

Check for the correct device that is connected

  xrandr

Create the correct resolution (this one is for Samsung SyncMaster 2233BW)

 sudo cvt 1680 1050 75

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• Download Franz for your distribution from MeetFranz.com
• change into the same directory as the downloaded file, then sudo tar -xf Franz-linux-x64-0.9.10.tgz -C /opt/franz
• (optional) wget "https://cdn-images-1.medium.com/max/360/1*v86tTomtFZIdqzMNpvwIZw.png" -O franz-icon.png then sudo cp franz-icon.png /opt/franz
• (optional) sudo touch /usr/share/applications/franz.desktop then sudo vim /usr/share/applications/franz.desktop

paste the following lines into the file, then save the file:

[Desktop Entry]
Name=Franz
Comment=

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http://stackoverflow.com/questions/22667401/postgres-json-data-type-rails-query
http://stackoverflow.com/questions/40702813/query-on-postgres-json-array-field-in-rails

#payload: [{"kind"=>"person"}]
Segment.where("payload @> ?", [{kind: "person"}].to_json)

#data: {"interest"=>["music", "movies", "programming"]}
Segment.where("data @> ?",  {"interest": ["music", "movies", "programming"]}.to_json)
Segment.where("data #>> '{interest, 1}' = 'movies' ")
Segment.where("jsonb_array_length(data->'interest') > 1")