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def A
  def say
    p "in A"
  end
end

a = A.new
def a.say
  p "in singleton"
end

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module A
  def say
    p "in A"
  end
end

module B
  include A
  
  def say

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14.04.2019 Foundation of data system

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Ruby in a nut shell

String and symbol

String: 'hello world' or "hello world"

Symbol: :hello or :'hello world'

Differences:

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Javascript

1. https://medium.freecodecamp.org/the-complete-javascript-handbook-f26b2c71719c?gi=d7bab6185a56

Ruby on Rails

1. https://medium.com/airbnb-engineering/large-scale-payments-systems-and-ruby-on-rails-bfe5b89f6f4

Systems

1. https://around25.com/blog/building-a-trading-engine-for-a-crypto-exchange/
2. https://github.com/donnemartin/system-design-primer
3. https://github.com/binhnguyennus/awesome-scalability

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#include <bits/stdc++.h>
#include <thread>
#include <atomic>

using namespace std;

int MODULO = 123456789;

#define ll long long

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#include <bits/stdc++.h>
using namespace std;

int main()
{
    ios_base::sync_with_stdio(false);
    cin.tie(NULL);
    return 0;
}

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import React, { Component } from 'react'
import config from './particles.json'

class Particlejs extends Component {
  componentDidMount() {
    let script = document.createElement('script')
    script.onload = function() {
      particlesJS.load('particlejs', config)
    }
    script.src = "https://cdn.jsdelivr.net/npm/[email protected]/particles.min.js"

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set background=dark
if version > 580
	hi clear
	if exists("syntax_on")
		syntax reset
	endif
endif

set t_Co=256
let g:colors_name = "flattown"

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### Install Java 8
sudo add-apt-repository -y ppa:webupd8team/java
sudo apt-get update
echo "oracle-java8-installer shared/accepted-oracle-license-v1-1 select true" | sudo debconf-set-selections
sudo apt-get install oracle-java8-installer -y

### Download and install the Public Signing Key
wget -qO - https://packages.elastic.co/GPG-KEY-elasticsearch | sudo apt-key add -

### Setup Repository