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10 Ruby one-liners that will blow your mind

Inspired by https://www.facebook.com/techieprogrammer016/videos/1903944506811756

	Python	Ruby
Swap two variables	a, b = b, a	a, b = b, a
Reverse a string	s[::-1]	s.reverse
Check palindrome	s == s[::-1]	s == s.reverse

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import { Controller } from 'stimulus'

// Sets the visibility of elements based on the checked state of a source
// element.
//
// source target is expected to emit a change event when the value changes so
// the UI can be updated.
//
// Target elements must be configured with a `data-visible-when` attribute set
// to either "on" or "off" depending on when the element should be visible. The

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#!/bin/sh
#
# Check for Ruby style errors using Rubocop

red='\033[0;31m'
green='\033[0;32m'
yellow='\033[0;33m'
NC='\033[0m'

if git rev-parse --verify HEAD >/dev/null 2>&1

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#!/bin/bash

# This script installs the version of Chromedriver that matches the installed
# Chrome applicaton.
#
# It installs the chromedriver binary into ~/bin/. If an existing chromedriver
# is installed it will be replaced by the updated binary.
#
# Assumptions:
#

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configure: WARNING: you should use --build, --host, --target
checking for ruby... /Users/jakob/.rvm/rubies/ruby-2.6.0/bin/ruby
*** using http instead of https ***
config.guess already exists
*** using http instead of https ***
config.sub already exists
checking build system type... x86_64-apple-darwin18.7.0
checking host system type... x86_64-apple-darwin18.7.0
checking target system type... x86_64-apple-darwin18.7.0
checking whether the C compiler works... yes

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#!/bin/bash 
COUNTER=0
while [  $COUNTER -lt 10 ]; do
  let COUNTER=COUNTER+1 
  wget "http://domæne.dk/navn?id=$COUNTER"
done

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module Delayed::Job::Ext
  module_function

  # Returns all failed jobs
  def failed_jobs
    Delayed::Job.where.not(:last_error => nil).order(:failed_at)
  end
  
  def failed_with(message)
    failed_jobs.

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def do_stuff
  list = [1, 2, 3, 4, 5]
  list.map { |value|
    return "Fizz" if value == 3
    value
  }
end

p do_stuff

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# frozen_string_literal: true
# A generic presenter class
class Presenter < SimpleDelegator
  attr_reader :view

  class << self
    # Returns true if object has been wrapped in a Presenter
    def decorated?(object)
      object.is_a?(Presenter)
    end

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begin
  require "bundler/inline"
rescue LoadError => e
  $stderr.puts "Bundler version 1.10 or later is required. Please update your Bundler"
  raise e
end

gemfile(true) do
  source "https://rubygems.org"
  gem "rails", github: "rails/rails"