kevgathuku

Instead of using a custom implementation to get the state of a process:

defmodule MyModule do
 use GenServer

  def report(server) do
    GenServer.call(server, :report)
  end

kevgathuku

You can have multiple Rails versions installed at the same time.

To install the rails version you need:

gem install rails --version=5.2.8

How to specify the rails version to use

kevgathuku

To specify the specific python version to use, you can specify it as follows in the .envrc file

layout python /usr/bin/python3.11

I also needed to install the python-venv package for python 3.11

❯ sudo apt install python3.11-venv

kevgathuku

let () = print_endline "THIS" in
let () = print_endline "IS" in
print_endline "3110";;

(*  Can also be written as *)
print_endline "THIS";
print_endline "IS";
print_endline "3110"

(* Source: https://courses.cs.cornell.edu/cs3110/2021sp/textbook/basics/printing.html *)

kevgathuku

Using direnv + opam via the following .envrc

export OPAMSWITCH="$HOME/path/to/opam/switch"
eval $(opam env)

Source

kevgathuku

 FAIL  _build/default/test/test/test/Leap_test.js
  Leap
    ✕ year not divisible by 4 in common year (30ms)
    ✕ year divisible by 4, not divisible by 100 in leap year (28ms)

  ● Leap › year not divisible by 4 in common year

    expect(received).toBe(expected) // Object.is equality

    Expected: false

kevgathuku

# CLI
sudo apt update -y
sudo apt install -y \
	git curl btop \
	docker.io docker-buildx \
	build-essential pkg-config autoconf bison rustc cargo clang \
	libssl-dev libreadline-dev zlib1g-dev libyaml-dev libreadline-dev libncurses5-dev libffi-dev libgdbm-dev libjemalloc2 \
	libvips imagemagick libmagickwand-dev mupdf mupdf-tools \
	redis-tools sqlite3 libsqlite3-0 libmysqlclient-dev \
	rbenv apache2-utils

kevgathuku

class DummyController < ApplicationController
  def do
    render json: { balance: 50 }
  end
end

kevgathuku

How to add an image to a gist

1. Create a gist if you haven't already.
2. Clone your gist:

   # make sure to replace `<hash>` with your gist's hash
   git clone https://gist.github.com/<hash>.git # with https
   git clone git@gist.github.com:<hash>.git     # or with ssh

kevgathuku

files:
  # If this file is edited, it must be removed from EC2 instance prior to deploy.
  "/opt/elasticbeanstalk/hooks/appdeploy/pre/09_yarn_install.sh" :
    mode: "000775"
    owner: root
    group: users
    content: |
      #!/usr/bin/env bash

      set -xe