Enumerable in Ruby

Faq.txt

Q1) What are enumerable in ruby?
ans:It is module which give the class the capabilities to use collection method.

Q2) What function is necessary to include in class to include enumerable?
ans: def each function is required to present in the class.

Q3) What is the function to check whether a value is present in the enumerable or not?
ans: We use find() function.

Q4) What are the which have pre defined Enumerable module.
ans: Hash, Array, Range, IO.

Mcq.txt

Q1) what will the output of this program :

      class Enum
      include Enumerable
      def each
          yield "spaghetti"
          yield "rotti"
          yield "salad"
          yield "water"
      end
  end

  menu=Enum.new
  puts menu
  
  a) error
  b) rotti
     salad
     water
     rotti
     water
     
  c) can't determine
  d) enum object

ans: d) enum object

Q2) What will the output of this statement refer the previous program :
    
    puts menu.drop(3)
    
a) spaghetti
   rotti
   salad
b) spaghetti
c) water
d) none of the above

ans: c) water

Q3) What will the output of this statement refer the previous program :

    puts menu.reverse_each{|i| puts i}

a) error
b) print the elements in reverse
c) can't define
d) water
   salad
   rotti
   spaghetti
   
ans: d)

Q4) What will the output of this statement refer the previous program :

    puts menu.maximum()
    
a) "water"
b) "rotti"
c) error
d) none of the above