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## constant-lookup-in-ruby.md

      
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                kyrylo
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              February 3, 2026 17:28
            
          
    Constant lookup in Ruby can happen lexically or through the
ancestry tree of the receiver(a class or module). You can identify
which lookup rules are being applied by the context you're in or by
the syntax being used to define a class or module.
A class body that is defined as class A::B::C; …; end will lookup
constants through the ancestry tree when a constant is evaluated in
its class body. Anytime you see A::B::C being used as syntax to
define a class or lookup the value of a constant the ancestry tree
is being used for the lookup.

  
## colorized_logger.rb
# frozen_string_literal: true
# config/initializers/colorized_logger.rb

# This initializer adds color to the Rails logger output. It's a nice way to
# visually distinguish log levels.
module ColorizedLogger
  COLOR_CODES = {
    debug:   "\e[36m",  # Cyan
    info:    "\e[32m",  # Green
    warn:    "\e[33m",  # Yellow

## index.html
<!DOCTYPE html>
<html lang="en">

<head>
  <meta charset="utf-8">
  <meta name="viewport" content="width=device-width, initial-scale=1">
  <title>Claim your gift</title>

  <script type="module">
    import { Application, Controller } from "https://cdn.jsdelivr.net/npm/@hotwired/stimulus@3.2.2/+esm";

## index.html
<!DOCTYPE html>
<html lang="en">

<head>
  <meta charset="utf-8">
  <meta name="viewport" content="width=device-width, initial-scale=1">
  <title>Dropdown with Backdrop</title>

  <style>
    body {

## index.html
<!DOCTYPE html>
<html lang="en">

<head>
  <meta charset="utf-8">
  <meta name="viewport" content="width=device-width, initial-scale=1">
  <title>Dropdown with Stimulus</title>

  <script type="module">
    import { Application, Controller } from "https://cdn.jsdelivr.net/npm/@hotwired/stimulus@3.2.2/+esm";

## index.html
<!DOCTYPE html>
<html lang="en">
<head>
  <meta charset="utf-8">
  <meta name="viewport" content="width=device-width, initial-scale=1">
  <title>Signup peekaboo 👻</title>

  <script type="module">
    import { Application, Controller } from "https://cdn.jsdelivr.net/npm/@hotwired/stimulus@3.2.2/+esm";

## index.html
<!DOCTYPE html>
<html lang="en">

<head>
  <meta charset="utf-8">
  <meta name="viewport" content="width=device-width, initial-scale=1">
  <title>Masonry layout with CSS columns</title>
  <style>
    body { font-family: "Lucida Grande"; padding-bottom: 2000px; }
    blockquote { margin: 0; }

## deploy.yml
name: Deploy

on:
  push:
    branches:
      - main

jobs:
  Deploy:
    if: ${{ github.event_name == 'push' && github.ref == 'refs/heads/main' }}

## plain.css
/* Plain CSS */

/* Hide scrollbar for Chrome, Safari and Opera */
.no-scrollbar::-webkit-scrollbar {
  display: none;
}

/* Hide scrollbar for IE, Edge and Firefox */
.no-scrollbar {
  -ms-overflow-style: none; /* IE and Edge */

## main_correct.go
// Correct way
package main

import (
	"errors"
	"fmt"
)

var errDoopsy = errors.New("doopsy")
	# frozen_string_literal: true
	# config/initializers/colorized_logger.rb

	# This initializer adds color to the Rails logger output. It's a nice way to
	# visually distinguish log levels.
	module ColorizedLogger
	COLOR_CODES = {
	debug: "\e[36m", # Cyan
	info: "\e[32m", # Green
	warn: "\e[33m", # Yellow
	<!DOCTYPE html>
	<html lang="en">

	<head>
	<meta charset="utf-8">
	<meta name="viewport" content="width=device-width, initial-scale=1">
	<title>Claim your gift</title>

	<script type="module">
	import { Application, Controller } from "https://cdn.jsdelivr.net/npm/@hotwired/stimulus@3.2.2/+esm";
	name: Deploy

	on:
	push:
	branches:
	- main

	jobs:
	Deploy:
	if: ${{ github.event_name == 'push' && github.ref == 'refs/heads/main' }}
	/* Plain CSS */

	/* Hide scrollbar for Chrome, Safari and Opera */
	.no-scrollbar::-webkit-scrollbar {
	display: none;
	}

	/* Hide scrollbar for IE, Edge and Firefox */
	.no-scrollbar {
	-ms-overflow-style: none; /* IE and Edge */
	// Correct way
	package main

	import (
	"errors"
	"fmt"
	)

	var errDoopsy = errors.New("doopsy")