fork download 
  1. puts 4.methods.include?(dup)
  2. puts 4.respond_to?(:dup)
Success #stdin #stdout 0s 4760KB
comments (?)
stdin 
Standard input is empty
stdout 
false
true
https://ideone.com/KC0yf
language:
Ruby (ruby 2.5.5)
created:
12 years ago
visibility:
public

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