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  1. class Foo
  2.   attr_accessor :bar
  3.  
  4.   def initialize
  5.     @bar = [1, 2, 3]
  6.   end
  7.  
  8.   def baz
  9.     if bar.empty?
  10.       bar = [4, 5, 6]
  11.     end
  12.     bar.size
  13.   end
  14.  
  15. end
  16.  
  17. a = Foo.new
  18. a.baz
  19.  
Runtime error #stdin #stdout #stderr 0.03s 7460KB
comments (?)
stdin 
Standard input is empty
stdout 
Standard output is empty
stderr 
prog.rb:12:in `baz': undefined method `size' for nil:NilClass (NoMethodError)
	from prog.rb:18:in `<main>'
https://ideone.com/YXdguT
language:
Ruby (ruby 2.5.5)
created:
10 years ago
visibility:
public

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