Ruby Debugging Useful Scripts - Still googling dumb ruby stuff, this is my compiling cheatsheet.

ruby_debug.md

edited with... https://hackmd.io/PdE46uT6TQO-WD6CcX1fXA?

Creating breakpoints

gem install pry

require 'pry'

def crypticMethod(env)
   # some code
   binding.pry
   puts "making sure binding.pry is not the last execution"
   # Note that binding.pry inserted binding.pry should not be the last line of a method. 
end 

Check where the method is declared

require 'json'
JSON.method(:parse).source_location

=> ["/Users/chanst/.rvm/rubies/jruby-9.2.9.0/lib/ruby/stdlib/json/common.rb", 155] 

Inspect what methods are defined of a given object

String.new.methods

Instance Variables

Inspect what Instance Variable Names exists

Object.new.instance_variables

=> # [:@water]

GET/SET the value of an instance variable

Object.new.instance_variables.get(:@water)
Object.new.instance_variables.set(:@water, "Poland Springs")