How to print keys and values from a text file

Question

I have a file called "output.txt":

    "name": "abc",
    "age": 28,
    "name": "xxx",
    "age": 11,
    "name": "yyyb",
    "age": 15,

I want to read the file and print the name and age values on one line, one after the other:

abc 28
xxx 11
yyyb 15

The code I wrote is:

  file_data = {}
   object= File.open('output.txt', 'r') do |file|
   file.each_line do |line|  
   key,value = line  
   file_data[value] = key
   puts file_data

I am getting:

{nil=>"    \"name\": \"abc"\",\n"}
{nil=>"    \"age\": 28,\n"}
{nil=>"    \"name\": \"11"\",\n"}
{nil=>"    \"age\": false,\n"}
{nil=>"    \"name\": \"yyyb\",\n"}
{nil=>"    \"age\": 15,\n"}

Don't assign the line to two variables and put it in a hash and print that. Just parse it (probably with a regular expression) and print the parts you want. — Dave Schweisguth, Apr 21 '16 at 15:31
Yes, it's far better to use YAML or JSON because it makes outputting and parsing trivially simple. You shouldn't be hand coding formatting and parsing if it can be done for you. — Keith Bennett, Apr 21 '16 at 15:38
@ Dave Schweisguth can you please give the example of the code . — user1642224, Apr 21 '16 at 15:38
Hi all i am using ruby 1.8.7 which is there on our servers --with using json it is giving an error cannot parse it. so trying on another way — user1642224, Apr 21 '16 at 15:48
_Sidenote_: storing an input in hash leads to the incomplete result because of duplicated keys. Do you want just to print input out, or you need to store it somehow? — Aleksei Matiushkin, Apr 21 '16 at 15:51
Welcome to Stack Overflow. This looks like an XY problem, where you're asking about Y but should ask about X, which would be "How can I store the data from a hash?" — the Tin Man, Apr 21 '16 at 16:33

Maxim Pontyushenko · Answer 1 · 2016-04-21T16:15:53.873

0

The best way is to use some popular format like YAML or JSON so you can work with it using some library. Also you could achieve it with code like this:

file_data = ""
object= File.open('output.txt', 'r') do |file|
  file.each_line do |line|
    key, value = line.split(':').map{|e| e.strip.gsub(/(,|\")/,'')}
    file_data << (key == 'name' ? "#{value} " : "#{value}\n")
  end
end
puts file_data

edited Apr 21 '16 at 16:15

answered Apr 21 '16 at 15:42

Maxim Pontyushenko

2,983
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Thanks for your reply but i can see the only the last hash from the file. the output {"name" => "yyyb", "age" => 15"} cannot see other values from teh file – user1642224 Apr 21 '16 at 15:55
@user1642224 what do you want to have as an output? – Maxim Pontyushenko Apr 21 '16 at 16:10

Aleksei Matiushkin · Answer 2 · 2016-04-21T16:11:20.007

0

File.read('output.txt')
    .split(/\s*,\s*/)
    .each_slice(2)
    .each do |name, age|
  puts [name[/(?<=: ").*(?=")/], age[/(?<=: ).*/]].join ' '
end

edited Apr 21 '16 at 16:11

answered Apr 21 '16 at 15:58

Aleksei Matiushkin

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@ mudasobwa I am get the output in this format name abc age 28 name xxx age 11 name yyyb age 15 . But i need to be in this format abc 28 xxx 11 yyyb 15 – user1642224 Apr 21 '16 at 16:04
Oh indeed. Sorry. Updated. – Aleksei Matiushkin Apr 21 '16 at 16:11

How to print keys and values from a text file

2 Answers2