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objects_to_text.rb

This Ruby code snippet demonstrates iterating through an array of hashes, extracting values based on their indices, and printing them with a tab delimiter. It first prints the keys of the first element as a tab-separated string. Then, it iterates through each element, extracting the id, val1, and val2 values based on their index, handling potential nil values by using empty strings and printing these extracted values separated by tabs. Finally, it prints the output.

Ruby code snippet

data = [
  {:id => "a", :val1 => [1, 2, 3], :val2 => [3, 4]},
  {:id => "b", :val1 => [0], :val2 => [9, 8, 7]}
]
#=> 
[{id: "a", val1: [1, 2, 3], val2: [3, 4]},


puts data.first.keys.join("\t")
id	val1	val2
#=> nil

data.each do |entry|
  id = entry[:id]
  val1 = entry[:val1]
  val2 = entry[:val2]
  
  max_length = [val1.length, val2.length].max
  max_length.times do |i|
      id_output = (i == 0 ? id : "")
      
      val1_output = (val1[i].nil? ? "" : val1[i])
      val2_output = (val2[i].nil? ? "" : val2[i])
      
      puts [id_output, val1_output, val2_output].join("\t")
  end
end
a	1	3
	2	4
	3	
b	0	9
		8
		7
#=> 
[{id: "a", val1: [1, 2, 3], val2: [3, 4]},
 {id: "b", val1: [0], val2: [9, 8, 7]}]

Executed with Ruby 3.4.5.