For 2023 (and 2024 ...) - we are now fully retired from IT training. We have made many, many friends over 25 years of teaching about Python, Tcl, Perl, PHP, Lua, Java, C and C++ - and MySQL, Linux and Solaris/SunOS too. Our training notes are now very much out of date, but due to upward compatability most of our examples remain operational and even relevant ad you are welcome to make us if them "as seen" and at your own risk.
Lisa and I (Graham) now live in what was our training centre in Melksham - happy to meet with former delegates here - but do check ahead before coming round. We are far from inactive - rather, enjoying the times that we are retired but still healthy enough in mind and body to be active!
I am also active in many other area and still look after a lot of web sites - you can find an index ((here)) |
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 [4008] Reading and checking user inputs - first lessons - Ruby - (2013-02-17) [4502] Reading and parsing a JSON object in Ruby - (2015-06-01) [4676] Running shell (operating system) commands from within Ruby - (2016-05-18) [4678] Expect with Ruby - a training example to get you started - (2016-05-18)
Some other Articles
Function prototype - what they are and why you should use them - C and C++Strings in C - strncmp strncpy and friendsPreprocessor directives in C and C++ - what they meanPassing information into functions in C - by name, by valueRUby - loading, using, changing, storing JSON format dataScenario outlines - tables of values to test - in Gherkin / CucumberTesting your new class - first steps with cucumberBuild up classes into applications sharing data types in RubyClarrissa-Marybelle - too long to really fit?Melksham - two small townships, or one big one?
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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.
Link to Ezine home page (for reading).
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