anaumov

function isString(sample) {
    return typeof(sample) === 'string' || sample instanceof String;
}

function isString(sample) {
    return sample.constructor == String;
}

anaumov

var literalString = 'wazzup';
console.log(typeof literalString); // string
console.log(literalString instanceof String); // false
console.log(literalString.constructor === String); // true

var constructedString = new String('wazzup');
console.log(typeof constructedString); // Object
console.log(constructedString instanceof String); // true
console.log(constructedString.constructor === String); // true

anaumov

vasia.with_lock do
  petya.withdrawal(100)
  vasya.deposit(100)
end

anaumov

# две транзакции ниже выполняются через разные подключени к базе

ActiveRecord::Base.transaction do
  petya.withdrawal(100)
  vasya.deposit(100)
end

ActiveRecord::Base.transaction do
  vasya.withdrawal(50)
  petya.deposit(50)

anaumov

# Если в кошельке Пети нет денег, то Вася все равно полчит свои 100р
class Account < ApplicationRecord
  validates :balance, numericality: { greater_than_or_equal_to: 0 }
end

petya.withdrawal(100)
vasya.deposit(100)

# Если в кошельке Пети нет денег, то Вася уже ничего не получит

anaumov

 def hash_to_form(hash)
   form = ''
   form << "<form method='#{hash[:method]}' action='#{hash[:url]}'>\n"
   hash[:inputs].each do |key, value|
     form << "  <input type='hidden' name='#{key}' value='#{value}' />\n"
   end
   form << "  <input type='submit' value='Submit' />\n"
   form << "</form>"
   puts form
 end

anaumov

signature = (/digest=(.+)/).match(headers['Content-Signature'])[1]
decoded_signature = Base64.urlsafe_decode64(signature)
content = request.body.string
pubilc_key = OpenSSL::PKey::RSA.new(YOUR_PUBLIC_KEY)
digest = OpenSSL::Digest::SHA256.new
pubilc_key.verify(digest, decoded_signature, content)

anaumov

describe SomeAPI, type: :request do
  describe 'GET /api/some' do
    context "user is signed in" do   
      before do
        Grape::Endpoint.before_each do |endpoint|
          endpoint.stub(:current_user).and_return(user)
        end
      end

      after { Grape::Endpoint.before_each nil }

anaumov

RSpec::Matchers.define :have_index_page_content do |expected|
 match do |actual|
  have_content('Welcome to Website')
 end
end

anaumov

openssl pkcs7 -print_certs -in old.p7b -out new.crt
# openssl pkcs7 -print_certs -in old.p7b -out new.cer