mkurtikov

 if (C)
            {
                if (c)
                {
                    if (a)
                    {
                        return "<link type=\"text/css\" rel=\"preload\" href=\"https://cdn.no{0}\" as=\"style\" onload=\"this.onload=null;this.rel='stylesheet'\" /><noscript><link rel = \"stylesheet\" href=\"https://cdn
                        .no{0}\"></noscript>";
                    }
                    else

mkurtikov

# A sample Gemfile
source "https://rubygems.org"

gem 'rack-contrib'
gem 'sinatra'
gem 'shotgun'
gem "sinatra-param", require: "sinatra/param"
gem 'sinatra-contrib'

mkurtikov

class A
  def initialize()
    @a = 1
  end  
end

a = A.new

a.instance_variable_get(:@a) # 1
a.instance_variable_set(:@a, 2)

mkurtikov

'hello'.hello_world # NoMethodError: undefined method `hello_world' for "hello":String

class String
  def hello_world
    p 'Hello ' + self 
  end
end

'hello'.hello_world # "Hello hello" 

mkurtikov

module A
  def self.a
    p 'self a'
  end
  
  def a
    p 'Aa'
  end
  
  def b 

mkurtikov

ERROR:

"error": {
  "code": "validation_error",
  "description": "Validation failed"
}

"meta": {
  "validation_errors": {
      "card_number": {

mkurtikov

require 'sinatra'
require 'sinatra/param'
require 'sinatra/json'

set :raise_sinatra_param_exceptions, true
set :show_exceptions, false

get '/hi' do
  param :param1,    Float,  required: true
  param :param2,    Float,  required: true

mkurtikov

## http://ruby-doc.org/core-2.3.0/Exception.html

begin
  p '1'
  1 / 0
rescue
  p '2'
end

# "1"

mkurtikov

## http://ruby-doc.org/core-2.1.2/Kernel.html

# /Users/tmp/a.rb

p 'Hello'

class A
  def hello
    p 'Hello'
  end

mkurtikov

A = Class.new do
  attr_reader :a
  def initialize(a)
    @a = a
  end
end

a = A.new 1
a.class.class #class