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  1. unless defined? var1
  2.   var1 = "Not empty"
  3. end
  4.  
  5. puts "var1: #{var1.inspect}"
  6.  
  7.  
  8. var2 = "Not empty" unless defined? var2
  9.  
  10. puts "var2: #{var2.inspect}"
Success #stdin #stdout 0.05s 9616KB
comments (?)
stdin 
Standard input is empty
stdout 
var1: "Not empty"
var2: nil
https://ideone.com/ihm2Pt
language:
Ruby (ruby 2.5.5)
created:
8 years ago
visibility:
secret

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