mistrikushal

# RSpec allows us to test private methods of a model.

for example, 

class User
  def is_active?
    true
  end
  private :is_active?
end

mistrikushal

if you see an error while installing mysql gem like, 

Gem::Ext::BuildError: ERROR: Failed to build gem native extension.

solution: 

sudo apt-get install mysql-server
sudo apt-get install mysql-client libmysqlclient-dev
sudo apt-get install libmysqld-dev libmysqlclient-dev mysql-client

mistrikushal

to create a .zip of a directory using bash shell,

$ zip -r filename.zip directory_path_to_zip

mistrikushal

# check first non-repeating element from array
  arr = [1,200,1,200,3,4,5]
  res = Array.new
  arr.detect{|e| res << e unless(arr.count(e) > 1) }
  puts "First non-repeated element in Array"+arr.to_s+" is : "+ res.first.to_s


# check even times repeating elements in array
  a =  [5, 3, 5, 1, 5, 1, 3]
  res_arr = Array.new

mistrikushal

# logic to check longest word from a string
str = 'this string contains a looooooong word'

longest_word = str.split(' ').max_by(&:length)
puts "Longest word of the string is: #{longest_word}"

mistrikushal

# perform multiplication on 'a' and 'b' without using X operator

def mul(a, b)
  x = 0
  b.times do
    x = x + a
  end
  puts "Multiplication of #{a.to_s} X #{b.to_s} = #{x.to_s}"
end

mistrikushal

Verifying that "kushalmistri.id" is my Blockstack ID. https://onename.com/kushalmistri

mistrikushal

require 'time'
require 'rubygems'

def calc_time_diff(current_time, end_time, end_time2=nil)
  parsed_end_time = Time.parse(end_time)
  parsed_current_time = Time.parse(current_time)
  result = Hash.new

  if parsed_end_time < parsed_current_time
    secs_diff = (parsed_current_time - parsed_end_time).to_i.abs

mistrikushal

# Create a CSV in Write Mode
CSV.open("#{Rails.public_path}/file_name.csv", 'wb') do |csv|

  # Add a first row into CSV which is column names
  csv << ['First name', 'Last name', 'Email']

end

# Now we have CSV file created in the public directory of the rails application and also it has columns ready
# Now Let's add some data into it. please note that the data in each cell of the row should be in order with the columns defined.

mistrikushal

COMMANDS = ['DEPEND', 'INSTALL', 'REMOVE', 'LIST']

@component_dependencies = Hash.new
@installed_components = Array.new

  def validate_command(command)
    command_size = command.size
    command_name = command.split(' ').first
    return false unless COMMANDS.include?(command_name)
    return false if command_name != command_name.upcase