Killavus

def quux
 :quux
end

Killavus

let someArray = [1; 2; 3];;
let incremented = map (function x -> x + 1) someArray;;

Killavus

def interesting
  [1, 2, 3].map { |x| x + 1 }
end

Killavus

```ruby
def bar
  :baz
end
```

Killavus

class MarkdownCreator
  def foo_bar
    [1, 2, 3].each do |n|
      puts n
    end
  end
end

Killavus

var x = 2;
var y = 2;

console.log(x + y);

Killavus

  dayOptions() {
    const { date } = this.props;
    const month = date.getMonth();
    const year = date.getFullYear();
    const possibleDays = makeRange(1, 31);
    const actualDays = possibleDays.filter(day => {
      // We take an advantage of the fact that if you
      // specify the 'invalid' date like 31st of February       
      // it'll automatically switch to the next month.
      // So new Date(2016, 1, 90) === Apr 30th 2016

Killavus

class Customer < ActiveRecord::Base
    after_create :send_welcome_email, unless: :auto_registered?
    has_one :auto_created, dependent: :destroy

    private
    def send_welcome_email
        CustomerMailer.welcome_email(self).deliver
    end
    
    def auto_registered?

Killavus

class CustomersController < ApplicationController
    # …
    def create
        @customer = Customer.new(customer_params)
        
        respond_to do |format|
            if @customer.save
                format.html { redirect_to @customer, 
                                            notice: 'Customer was successfully created.' }
                format.json { render :show, status: :created, 

Killavus

class Customer < ActiveRecord::Base
    has_one :auto_created, dependent: :destroy
    
    def self.register(params)
        new(params).tap do |customer|
            customer.save!
            customer.send_welcome_email
        end
    end