Code Explainers

Code explainers tagged #metaprogramming

ruby 
class QueryProxy
  ALLOWED = %i[where limit offset order includes distinct].freeze
 
  def initialize(relation, operations = [])

Building a lazy query proxy in Ruby

metaprogramming method_missing lazy-evaluation
Advanced 7 steps
ruby 
module Instrumentation
  module Timing
    def self.[](*method_names)
      Module.new do

Timing methods with a prepended module in Ruby in Rails

metaprogramming prepend instrumentation
Advanced 7 steps
ruby 
class Credentials
  SENSITIVE = %i[password api_key secret_token access_key].freeze
  REDACTED = "[REDACTED]".freeze
 

Redacting secrets in Ruby object output

serialization introspection security
Intermediate 7 steps
ruby 
module DeepFreeze
  module_function
 
  def call(obj)

Recursively freezing nested Ruby data

recursion immutability pattern matching
Intermediate 9 steps
python 
class Typed:
    """A data descriptor that enforces a type and optional validation."""
 
    def __init__(self, expected_type, validator=None):

Building a typed descriptor in Python

descriptors validation metaprogramming
Advanced 8 steps