ddeveloperr

Problem: Remove multiple deleted files in Git repo

Note that '~$' stands for root directory in your terminal

Solutions:

This command will ONLY remove the deleted files from the git:

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states = Array[ ["AK", "Alaska"], 
                ["AL", "Alabama"], 
                ["AR", "Arkansas"], 
                ["AS", "American Samoa"], 
                ["AZ", "Arizona"], 
                ["CA", "California"], 
                ["CO", "Colorado"], 
                ["CT", "Connecticut"], 
                ["DC", "District of Columbia"], 
                ["DE", "Delaware"], 

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How to Check ubuntu version using terminal

$ lsb_release -a

####And you will got something like a :

No LSB modules are available.
Distributor ID: Ubuntu
Description: Ubuntu 14.04.3 LTS

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UNIX Commands

pwd present working directory

ls list current directory contents

ls -la list current directory contents in long format and show hidden files

man <some unix command> Bring up the manual pages for a command. Type q to exit

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Deep learning here: https://www.youtube.com/watch?v=y57OnWV6dRE
                    https://gorails.com/episodes/the-params-hash?autoplay=1

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Migration Overview
Migrations are a convenient way to alter your database schema over time in a consistent and easy way.
They use a Ruby DSL so that you don't have to write SQL by hand, allowing your schema and changes to be 
database independent.

db:migrate runs (single) migrations that have not run yet.
db:create creates the database
db:drop deletes the database
db:schema:load creates tables and columns within the (existing) database following schema.rb

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HTML: 
<div class="hover_img">
    <a href="http://ddeveloperr.github.io/p1/" target="_blank">Build a Simple Google Clone Website<span><img src="img/1_google_clone.jpg" alt="image" height="100" /></span></a>
</div>
    				

CSS:
.hover_img a { position:relative; }
.hover_img a span { position:absolute; display:none; z-index:99; }

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TO LEARN: https://curl.haxx.se/docs/httpscripting.html

Why cURL?
Because: http://code.tutsplus.com/tutorials/techniques-for-mastering-curl--net-8470

ddeveloperr

## More details: http://ruby.bastardsbook.com/chapters/recursion/

#1
def countdown(n)
  return if n.zero? # base case
  puts n
  countdown(n-1)    # getting closer to base case 
end               

countdown(5) # > 5 4 3 2 1

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# Example of Self-Referential Data Structures - A Binary Tree

class TreeNode
    attr_accessor :value, :left, :right
    
    # The Tree node contains a value, and a pointer to two children - left and right 
    # Values lesser than this node will be inserted on its left
    # Values greater than it will be inserted on its right
    def initialize val,left,right
        @value = val