Clarification on the Ruby << Operator

Question

I am quite new to Ruby and am wondering about the << operator. When I googled this operator, it says that it is a Binary Left Shift Operator given this ex

Answer 1

<< is just a method. It usually means "append" in some sense, but can mean anything. For strings and arrays it means append/add. For integers it's bitwise shift.

Try this:

class Foo
  def << (message)
    print "hello " + message
  end
end

f = Foo.new
f << "john" # => hello john