Programming Ruby 3.3

PP

PP uses the PrettyPrint library to format the results of inspecting Ruby objects. In addition to the methods in the class, it defines a global function, pp, which works like the existing p method but formats its output.

PP has a default layout for all Ruby objects. But you can override the way it handles a class by defining the method pretty_print, which takes a PP object as a parameter. It should use that PP object’s methods (text, breakable, nest, group, and pp) to format its output:

ref_meta_ruby/pretty_print.rb

require 'pp'

Customer = Struct.new(:first_name, :last_name, :dob, :country)
cust = Customer.new("Walter", "Wall", "12/25/1960", "Niue")

puts "Regular print"
p cust

puts "\nPretty print" ...