Created
          January 10, 2018 00:07 
        
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    flatten an array of arbitrarily nested arrays 
  
        
  
    
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  | def flatten_array(arr) | |
| arr.reduce([]) do |res, item| | |
| item.kind_of?(Array) ? res + flatten_array(item) : res << item | |
| end | |
| end | |
| # flatten_array( [[1,2,[3]],4]) | 
  
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