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RUby - loading, using, changing, storing JSON format data

json is an excellent data exchange format - it "serialises" a data structure that consists of arrays and hashes (or whatever ordered and unordered collections are called in the language you're using) so that the structure can be saved, transferred between programs and computers, and reloaded easily.

All of the languages we teach (I think) has classes that support JSON and it's very much the modern 'standard'. And you can grab some json from our website at http://www.wellho.net/service/_.json to test out our sample programs.

Today's sample - as I've been running a Ruby course is in Ruby.

Starting with reading and parsing from a file:

  require 'json'
  fh = File.new 'sample.json'
  content = fh.read
  info = JSON.parse content


... yes, really that simple. content contains the raw (json string) data, and info contains the fully loaded Hash and List structure. Full program [here] goes on to loook at

• displaying elements of the data
• changing the data
• saving the modified structure into a new file of Json.
(written 2015-10-23)

 
Associated topics are indexed as below, or enter http://melksh.am/nnnn for individual articles
R113 - Ruby - Further Input and Output
  [4678] Expect with Ruby - a training example to get you started - (2016-05-18)
  [4676] Running shell (operating system) commands from within Ruby - (2016-05-18)
  [4502] Reading and parsing a JSON object in Ruby - (2015-06-01)
  [4008] Reading and checking user inputs - first lessons - Ruby - (2013-02-17)


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Passing information into functions in C - by name, by value
RUby - loading, using, changing, storing JSON format data
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Testing your new class - first steps with cucumber
Build up classes into applications sharing data types in Ruby
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This is a page archived from The Horse's Mouth at http://www.wellho.net/horse/ - the diary and writings of Graham Ellis. Every attempt was made to provide current information at the time the page was written, but things do move forward in our business - new software releases, price changes, new techniques. Please check back via our main site for current courses, prices, versions, etc - any mention of a price in "The Horse's Mouth" cannot be taken as an offer to supply at that price.

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