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# The goal of this code snippet isn't to make an email validator..
# So the REGEX is not steady but works for simple cases.
#
# You can extract whatever you want by changing the Regex. :)

line = "Congratulation ! here is your email : mehdi-farsi@long-and_boring-company_name.com. Are you happy ?"

email = line[/(\w|[\.\-])+@(\w|[\.\-])+\.[a-zA-Z]+/]

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class Vehicle; end

class Car < Vehicle
  def initialize
    # A composition to separate standalone Engine class.
    # That permit to create a class Bicycle without give it
    # the property of an engine Vehicle.
    @engine = GasolineEngine.new
  end

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# Ruby Method-Calling Hierarchy.
#
# When a method is called Ruby :
#
# 1 - searches the method in class.
#
# 2- searches the method in each included modules
#    from the last one to the first one.
#
# Study Case:

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# Flat the array layer by layer 
# 
# Insights:
#
# - Using recursion.
#

class Array
  def my_flatten(depth = nil)
    if depth.nil? || depth.is_a?(Fixnum)

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# 
# Main difference: Procs are objects, blocks are not.
#
# The '&' tells ruby to turn the proc into a block.
#

class Array
  def map2
    new_ary = []
    self.each do |elem|

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require "net/http"

uri = URI('YOUR URL')

req = Net::HTTP::Head.new(uri)

res = Net::HTTP.start(uri.hostname, uri.port) do |http|
  http.request(req)
end

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<%= link_to "Name", sort: "Name" %>
<%= link_to "Price", sort: "price" %>
<%= link_to "Popular", sort: "popular" %>

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# Example:
#
# A Product Model with a :name attribute

first, last = Product.pluck(:name).values_at(0, Product.count - 1)

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# Example:
#
# Wanna pass an array of categories via a GET request.

http://YOUR_URL/?category[]=handbag&category[]=wallet

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# Procs and Lambdas. They are both a Proc object.
#
# The main differences:
#
# 1- Lamdbas are strict about argument number instead of Procs.
# 2- Lambda :return returns out the scope. Proc :return returns out of the calling scope.

# Lamdbas are strict about argument number instead of Procs.
l = lambda { |word| puts word }