Evil Ruby: Turning procs into first class functions

abandon_all_hope_ye_who_enter_here.md

• To read the original tweet and comments, click here.
• For my followup abomination, click here
• If you're thinking about treating this as anything other than art, read there 👇

DISCLAIMER:

THIS IS ART, DON'T ACTUALLY DO THIS IN ANY CODE THAT YOU CARE ABOUT!

☠️ This is not a place of honor ☠️

☠️ Nothing of esteem is commemorated here ☠️

☠️ Nothing valued is here ☠️

~~ Expert Judgment on Markers To Deter Inadvertant Human Intrusion Into the Waste Isolation Pilot Plant

evil_ruby_turning_procs_into_first_class_functions.rb

# Okay, so, we've got us a lambda, check it out:
fancify = -> x { "✨ #{x} ✨" }

# But how to call it? like this? Psh...
fancify.("2nd class") # => "✨ 2nd class ✨"

# What do we want?💥 1st class functions!💥 When do we want them? Now!
fancify("1st class") rescue $! # => #<NoMethodError: undefined method `fancify' for main:Object>

# 😞
# 😑
# 😐
# 😠
# 😡
# 👿
# 😈 ...fire flew from his fingertips as he rosined up his bow
require "binding_of_caller"
def method_missing(name, *args, &block)
  (bnd = binding.of_caller 1)             &&
    (bnd.local_variable_defined? name)    &&
    (local = bnd.local_variable_get name) &&
    (local.respond_to? :call)             ?
    (local.call *args, &block)            :
    super
end

# Hell's broke loose in Ruby, and the devil deals the cards!
fancify = -> x { "✨ #{x} ✨" }
fancify.("2nd class")  # => "✨ 2nd class ✨"
fancify("1st class!")  # => "✨ 1st class! ✨"
fancify "🤘😈🤘"        # => "✨ 🤘😈🤘 ✨"

sing = -> lyric { "🔥#{lyric.center 30}🔥" }
sing("Fire on the Mountain")             # => "🔥     Fire on the Mountain     🔥"
sing.("run boys, run")                   # => "🔥        run boys, run         🔥"
sing["The devil's in the House"]         # => "🔥   The devil's in the House   🔥"
sing.[] "of the Rising Sun"              # => "🔥      of the Rising Sun       🔥"
sing.call "Chicken in a bread pan"       # => "🔥    Chicken in a bread pan    🔥"
sing === "making a nest"                 # => "🔥        making a nest         🔥"
sing.yield "Granny, does your dog bite?" # => "🔥 Granny, does your dog bite?  🔥"
sing::("Yes, child, yes")                # => "🔥       Yes, child, yes        🔥"