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  1. a = %w(java ruby rust)
  2. puts a.join(',')
  3. print *a.map.with_index {|s, i| 0 < i ? ',' + s : s}, "\n"
  4. print *a.zip([','] * (a.size - 1)).flatten, "\n"
  5. a.each_with_index do |s, i|
  6.   print ',' if 0 < i
  7.   print s
  8. end
  9. puts
  10. def f(a)
  11.   if a.size == 1
  12.     a[0]
  13.   else
  14.     a[0] + ',' + f(a.drop 1)
  15.   end
  16. end
  17. puts f a
  18.  
Success #stdin #stdout 0.01s 5940KB
comments (?)
stdin 
Standard input is empty
stdout 
java,ruby,rust
java,ruby,rust
java,ruby,rust
java,ruby,rust
java,ruby,rust
https://ideone.com/cKprYN
language:
Ruby (ruby 2.5.5)
created:
7 years ago
visibility:
public

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