pvin

class Lift
  GROUND_FLOOR = 1
  TOTAL_FLOOR = 10
  @@previous_floor =0
  TRAVEL_TIME = 3
  DO_DC = 10
 
 
  attr_reader :elevator_on_floor
  attr_accessor :elevator_target_floor, :new_floor

pvin

IO.puts "hello world!"

pvin

events/_forms.html.erb

 <div class="form-group test">
           <%= f.label :auctions, class: "col-lg-4 col-sm-2 control-label required" %>
           <div class="col-lg-8" id="filter">
           <%= f.collection_select :auction_ids, filter_auction, :id, :name, {}, {:multiple => true, class: "form-control acution-class", required: true}%>
           </div>
         </div>

<script>

pvin

class Document
  def average_word_length
    total = 0.0
    words.each { |word| total += word.size }
    total / word_count
  end
end

#This is the kind of problem that the inject method is tailor-made to solve. Like each , inject takes a block and calls the 
#block with each element of the collection. Unlike each , inject passes in two arguments to the block: Along with each 

pvin

#The easiest way to screw up one of these iterating methods is to change the collection out from underneath the method.
#Here, for example, is a seriously misguided attempt to remove all of the negative numbers from an array:

array = [ 0, -10, -9, 5, 9 ]
array.each_index {|i| array.delete_at(i) if array[i] < 0}
pp array

#The trouble with this code is that it will tend to leave some negative numbers behind: Removing the first one (the -10 ) from 
#the array messes up the internal indexing of the each method, so much that it will miss the second negative number, leaving 
#us with a result of:

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#Usual way 

unique = []
words.each { |word| unique << word unless unique.include?(word) }

#What we really need is a collection that doesn’t allow duplicates but does feature very fast and easy answers to the “is this 
#object in there?” question. The punch line is that we need a set. Fortunately, Ruby comes with a perfectly serviceable, if 
#sometimes forgotten, 

#Set class:

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#Be careful not to confuse chomp with the chop method. The chop method will simply knock off the last character of the 
#string, no matter what it is

"hello\n".chomp
#=> "hello"

"hello".chomp
#=> "hello"

"hello".chop

pvin

puts 'yes yes'.sub( 'yes', 'no' )
=> no yes

puts 'yes yes'.gsub( 'yes', 'no' )
=> no no

pvin

Rspec::
rspec
rspec spec/models
rspec spec/controllers/accounts_controller_spec.rb
rails generate rspec:model
/factories /support /models /controllers /features /views /mailers /routing /helpers

Model spec - behavior of model
require "rails_helper"

pvin

login with peer authondication
  sudo -u postgres psql
login with md5


Then type:

sudo -u postgres psql

Then: