Photo by Mika Baumeister on Unsplash

What are Metadata?

Metadata are data about data

for example lets say we have a hello.txt file which have 1 line of text “Hello World”

In this case “Hello World” are data

Metadata if this data would be:

  • file size
  • file format
  • file created at
  • filename
  • file location
  • created by

Other good example that i heard once:

Telephone connection

Data is the conversation itself, meaning the phone call content


  • when was the connection
  • how long was the connection
  • between which numbers
  • in which country or between which countries

What do you think ? Let me know in comments below to help me improve this article

Thanks for reading!

Simplest way to model a Graph or Tree

Photo by Nick Fewings on Unsplash

Disclaimer: The code examples are in Scala but they will be simple enough and without any advanced features such that anyone can understand them. I am planing to run this series in multiple languages because the problems demystified here are language agnostic

Disclaimer: The code examples are in Scala but…

How to groupBy and collect rows with multiple columns into a list

How to groupBy a flat dataset into a case class that will have for example a String field and list field, where that list will contain some objects

case class Example(id: String, tags: List[SomeOtherClass])

lets imagine data sets of Crypto Currency Data

Investors Portfolios and Price Reports

Basic Models


Do you know what SaaS stands for ?

Yes it means Software as a Service. You may know some products that are like SaaS For example Twilio, PayPall, Zuora, Stripe and many others

The platforms that i mentioned above are services that we can integrate our Applications

Before we explain…

CoderDidit (Martin Kuzdovich)

I am a Software Engineer 👨‍💻 that works remotely, builds his own projects, and shares the journey online

Get the Medium app

A button that says 'Download on the App Store', and if clicked it will lead you to the iOS App store
A button that says 'Get it on, Google Play', and if clicked it will lead you to the Google Play store