From: Michael Fellinger <m.fellinger@...>
Date: 2008-08-30T15:14:38+09:00
Subject: Re: array#push

On Sat, Aug 30, 2008 at 3:02 PM, Ron Green <ron.green@gmail.com> wrote:
> Given the foloowing code:
> class Person
>  attr_accessor :first_name, :middle_name, :last_name
>  def whole_name
>    n = first_name + " "
>    n << "#{middle_name} " if middle_name
>    n << last_name
>    return n.size
>  end
> end
>
> m = Person.new
> m.first_name = "Sam"
> m.middle_name = "Ray"
> m.last_name = "Smith"
>
> x = m.whole_name
>
> puts x
>
>
> Why is x =13 instead of 3?

You are asking about Array#push, yet not using it. If you would try to
replace '<<' with '.push' you would see that instead you are handling
Strings.

irb(main):001:0> a = 'Sam'
=> "Sam"
irb(main):002:0> a << ' Ray'
=> "Sam Ray"
irb(main):003:0> a = ['Sam']
=> ["Sam"]
irb(main):004:0> a << 'Ray'
=> ["Sam", "Ray"]
irb(main):005:0> a = 'Sam'
=> "Sam"
irb(main):006:0> a.push('Ray')
NoMethodError: undefined method `push' for "Sam":String
        from (irb):6
irb(main):007:0> a = ['Sam']
=> ["Sam"]
irb(main):008:0> a.push('Ray')
=> ["Sam", "Ray"]

>
> --
> ron.green@gmail.com
>