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def reverse_array(arr)
  return arr if arr.empty?
  arr = arr.dup

  start_index = 0
  end_index = arr.length - 1

  while start_index < end_index
    arr[start_index], arr[end_index] = arr[end_index], arr[start_index]

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def query(params)
  # this magic method prepares sql and gets correct data from DB
  # NO CHANGES HERE
  puts "Params = #{params}"
  [
    {name: "John", surname: "Doe", age: 33},
    {name: "John", surname: "Doe", age: 34},
    {name: "John", surname: "Doe", age: 35}
  ]
end

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Send email to multiple recipients

Send multiple emails to different recipients.

Mailer class

# app/mailers/notify_mailer.rb

class NotifyMailer < ApplicationMailer

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class Profile extends React.Component {
  render(props) {
    return <div>{props}</div>
  }
}

// Dumb component

function Profile(props) {
  return <div>{props}</div>

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First, add pry-rails to your Gemfile:
https://github.com/rweng/pry-rails

gem 'pry-rails', group: :development

Then you'll want to rebuild your Docker container to install the gems

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import React from 'react'

// Example 1: translation

const TranslationContext = {
  // most likely, from Provider or any other top-level component
  locale: 'en',
  strings: {
    en: {
      'user.my_account': 'My account'

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What is this?

How do you compare date/times in RSpec?

If you do this

expect(Time.now.to_i).to eq Time.new(2014, 4, 2).to_i

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Kubernetes Commands

Helper setup to edit .yaml files with Vim:

• VIM Setup for Yaml files

List of general purpose commands for Kubernetes management:

• PODS
• Create Deployments

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Multiple SSH Keys settings for different github account

create different public key

create different ssh key according the article Mac Set-Up Git

$ ssh-keygen -t rsa -C "[email protected]"

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Rails 5 and 6 Deployment with Ubuntu, Mina, Puma and Nginx

Based on this tutorial but simplified and inlined. Particularly removed any Rails and 3rd party services part, assumed you just need deployment to any Ubuntu machine.

Prerequisite

1. A functional Rails app
2. Hosted Git repository (Github, Bitbucket, Gitlab)
3. Cloud hosting account (Digital Ocean, Vultr, Linode, Lightsail)
4. Local SSH account