[LRUG] Ruby question for a change! Why does this happen...

[Ronny Ager-Wick]

You don't have any definition for what should happen to foo when assigning a 
value.
Try adding this:

def foo= obj
   @bar = obj
end


On 01/07/14 17:12, Kenneth Lee wrote:
>
> Doing some lazy instantiation and come across this oddity, maybe I'm just 
> being dense.
>
> $ irb
>
> irb(main):001:0> def foo
>
> irb(main):002:1>   @bar ||= []
>
> irb(main):003:1> end
>
> => :foo
>
> irb(main):004:0> foo
>
> => []
>
> irb(main):005:0> foo += []
>
> NoMethodError: undefined method `+' for nil:NilClass
>
> from (irb):5
>
> from /Users/ken/.rbenv/versions/2.1.1/bin/irb:11:in `<main>'
>
> irb(main):006:0> foo
>
> => nil
>
>
>
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