Test if @properties are set and not empty

has_required_properties_test.rb

require 'pry'


class Thing
  REQUIRED = [:a,:b,:c]
  attr_accessor :a, :b, :c, :d

  def initialize( a: '', b: '', c: '', d: '')
    @a = a.to_s
    @b = b.to_s
    @c = c.to_s
    @d = d.to_s
  end

  def valid?
    puts "Testing validity: #{self}.valid?"
    has_required_properties_shortform?
  end

  def has_required_properties_longform?
    puts "Testing Required Properties: #{self}.has_required_properties?"
    valid = true
    REQUIRED.each do |prop|
      print "Testing #{prop}"
      if instance_variable_get("@#{prop}").to_s.empty?
        print " - #{prop} was empty."
        valid = false
      end
      puts
    end
    valid
  end

  def has_required_properties_shortform?
    # Enumerable#none? iterates a code block through the collection,
    #   and returns false if any iteration returns false, otherwise true.
    REQUIRED.none? { |prop| instance_variable_get("@#{prop}").to_s.empty? }
  end


  def other_test
    true
  end
end


a = Thing.new()
b = Thing.new(a: "1234")
c = Thing.new(a: "1234", b: 13, c:"135135")
d = Thing.new(a: "1234", b: "13", c:"135135", d:"1555")

puts a.valid? # false
puts b.valid? # false
puts c.valid? # true
puts d.valid? # true

a.a= 'hotdog'
a.b= 'pizza'
a.c= 'wowow'
a.d= 'yeeaahahh'
puts a.valid?