djuber

class SomeClass
  def self.client
    true
  end
end

class UsesClient
  def self.call
    client.nil?
  end

djuber

require 'rake/task'

module Logging
  module Rake
    module Task
      def execute(args)
        message = {
          rake_task: {
            name: self.name,
            arguments: args.to_a

djuber

# this is constant space, linear time, no memoization.
def fib(n)
  counter, current, previous = 0, 0, 1
  while counter < n
    counter, current, previous = counter + 1, current + previous, current
  end

  current
end

djuber

Asciinema

{% embed https://asciinema.org/a/330532 %}

Codepen

{% embed https://codepen.io/elisavetTriant/pen/KKvRRyE %}

Gist

djuber

(defun de-ansify ()
  "apply ansi color codes in currently selected region"
  (interactive)
  (ansi-color-apply-on-region
   (region-beginning)
   (region-end)))

djuber

;; Thanks @bschmeck

(defun shmk/ivy--regex-dashes (str)
  "Build a regex sequence from STR.
Insert .* before each -."
  (let ((subs (split-string str "-")))
    (if (= (length subs) 1)
        (ivy--regex str)
      (ivy--regex (concat "^" (string-join subs "[[:alnum:]]*-"))))))

djuber

# step should have NODE_VERSION and YARN_VERSION environment variables declared 

      - run:
          name: Download NodeJS things
          command: |
            mkdir -p nodejs-downloads/
            cd nodejs-downloads/
            [ -f node-v${NODE_VERSION}-linux-x64.tar.xz ] || curl -O https://nodejs.org/dist/v${NODE_VERSION}/node-v${NODE_VERSION}-linux-x64.tar.xz
            [ -f yarn-v${YARN_VERSION}.tar.gz ] || curl -O -L https://yarnpkg.com/downloads/${YARN_VERSION}/yarn-v${YARN_VERSION}.tar.gz

djuber

Rails, Webpacker, Postgresql on Docker (DEV setup)

Create Rails app with docker

$ docker run --rm -it -v ${PWD}:/usr/src -w /usr/src ruby:2.7 sh -c 'gem install rails:"~> 6.0.3" && rails new --database=postgresql <app_name>'

Create Docker files

1. cd into project directory

djuber

##
## A stegosaur with a top hat?
##
$the_cow = <<EOC;
$thoughts                             .       .
 $thoughts                           / `.   .' "
  $thoughts                  .---.  <    > <    >  .---.
   $thoughts                 |    \\  \\ - ~ ~ - /  /    |
         _____          ..-~             ~-..-~
        |CRUFT|   \\~~~\\.'                    `./~~~/

djuber

class Array
  # group elements by their identity, and count each distinct item
  def counts
    group_by(&:itself).map {|k,v| [k, v.count] }
  end
end