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rubyirb

Defining and calling a method in irb

I'm struggling with understanding understanding OOP. I am trying to use IRB to play around with Ruby and deepen my understanding.

In IRB

foo = Object.new

Creates a new object However if I try and give irb a definition and call it on that object it doesn't work. (does the def have to happen in a .rb file and loaded into Ruby?)

def bar "hello" end
Solution

  • You need to define the method in the class you want it to apply to.

    class NewObject
  def foo
    puts "hello"
  end
end

    these methods are called like:

    x = NewObject.new
x.foo

    You can create methods that are not specific to a class just by defining them:

     def bar
   puts "bar!"
 end

    and just call them as:

    bar