Ruby language basic, programming homework help


2. Download the file called MegaGreeter.rb from blackboard and save it in the working folder you created last week. (10pts)a. Explain what is happening for each line of this piece of code ? How is it different from what you would have done in Java?def say_hi  if @names.nil?  puts “…”  elsif @names.respond_to?(“each”)  @names.each do |name|  puts “Hello #{name}!”  end  else  puts “Hello #{@names}!”  end  endb. Explain what is happening for each line of this piece of code? What does the join method do?def say_bye  if @names.nil?  puts “…”  elsif @names.respond_to?(“join”)  # Join the list elements with commas  puts “Goodbye #{@names.join(“, “)}.  Come back soon!”  else  puts “Goodbye #{@names}.  Come back soon!”  endc. In the irb prompt type in  require ‘MegaGreeter’ (You need to be in the same directory as the MegaGreeter.rb file you downloaded). Instantiate a MegaGreeter object. Now Type appropriate commands manipulating the object you created to  i. Greet and say goodbye to the whole worldii.Greet and say Goodbye to a particular personiii. Greet and say Goodbye to a list of nameshere the MegaGreeter.rb  file #!/usr/bin/env ruby

class MegaGreeter
attr_accessor :names

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# Create the object
def initialize(names = “World”)
@names = names

# Say hi to everybody
def say_hi
if @names.nil?
puts “…”
elsif @names.respond_to?(“each”)
# @names is a list of some kind, iterate!
@names.each do |name|
puts “Hello #{name}!”
puts “Hello #{@names}!”

# Say bye to everybody
def say_bye
if @names.nil?
puts “…”
elsif @names.respond_to?(“join”)
# Join the list elements with commas
puts “Goodbye #{@names.join(“, “)}. Come back soon!”
puts “Goodbye #{@names}. Come back soon!”

if __FILE__ == $0
mg =

# Change name to be “Zeke”
mg.names = “Zeke”

# Change the name to an array of names
mg.names = [“Albert”, “Brenda”, “Charles”,
“Dave”, “Engelbert”]

# Change to nil
mg.names = nil

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