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def flatten(array)
  return "Input must be an array" if !array.kind_of?(Array)
  array.reduce([]) do |res, el|
    Array === el ? res + flatten(el) : res << el
  end
end

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class Customer
  include Math

  EARTH_RADIUS = 6371 # Earth Radius in km

  attr_accessor :id, :name, :latitude, :longitude

  def initialize(params)
    @id = params["user_id"]
    @name = params["name"]

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# Navigating
  visit('/projects')
  visit(post_comments_path(post))
  expect(page).to have_current_path(post_comments_path(post))

# Clicking links and buttons
  click_link('id-of-link')
  click_link('Link Text')
  click_button('Save')
  click_on('Link Text') # clicks on either links or buttons

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upload(files) {
  const config = {
    onUploadProgress: function(progressEvent) {
      var percentCompleted = Math.round((progressEvent.loaded * 100) / progressEvent.total)
      console.log(percentCompleted)
    }
  }

  let data = new FormData()
  data.append('file', files[0])

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{
    "atomKeymap.promptV3Features": true,
    "editor.multiCursorModifier": "ctrlCmd",
    "editor.formatOnPaste": true,
    "files.insertFinalNewline": true,
    "files.trimTrailingWhitespace": true,
    "editor.renderWhitespace": "all",
    "editor.tabSize": 2,
    "explorer.confirmDragAndDrop": false,
    "terminal.external.osxExec": "iTerm.app",

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# Ruby CircleCI 2.0 configuration file
#
# Check https://circleci.com/docs/2.0/language-ruby/ for more details
#
version: 2
jobs:
  build:
    docker:
      # specify the version you desire here
      - image: circleci/ruby:2.4.1-node-browsers

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MyApp::Application.configure do
  # Restrict access with HTTP Basic Auth for staging environment
  if ENV['STAGING_AUTH']
    config.middleware.use Rack::Auth::Basic do |username, password|
      ENV['STAGING_AUTH'].split(':') == [username, password]
    end
  end
end

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import axios from 'axios'

const tokenEl = document.getElementsByName('csrf-token')[0]
if (tokenEl) {
  const token = tokenEl.getAttribute('content')
  axios.defaults.headers.common['X-CSRF-Token'] = token
}
axios.defaults.headers.common['Accept'] = 'application/json'
axios.defaults.headers.post['Content-Type'] = 'application/json'

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# config/routes.rb
resources :documents do
  scope module: 'documents' do
    resources :versions do
      post :restore, on: :member
    end

    resource :lock
  end
end

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ActionView::Base.field_error_proc = proc do |html_tag, instance_tag|
  fragment = Nokogiri::HTML.fragment(html_tag)
  field = fragment.at("input,select,textarea")

  html = if field
    field["class"] = "#{field["class"]} is-invalid"
    html = <<-HTML
      #{fragment}
      <p class="invalid-feedback">#{instance_tag.error_message.to_sentence}</p>
    HTML