fork(7) download 
  1. arr = ['x', 'o', 'x', '.', '.', 'o', 'x']
  2. p arr.each_index.select{|i| arr[i] == 'x'}
Success #stdin #stdout 0.01s 7452KB
comments (?)
stdin 
Standard input is empty
stdout 
[0, 2, 6]
https://ideone.com/VTErvf
language:
Ruby (ruby 2.5.5)
created:
12 years ago
visibility:
public

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