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  • Dijkstra’s algorithm to find the shortest path

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    Let’s imagine you and your best friend live quite far apart, you haven’t seen him for a while, your best friend is organizing a party at his house and you’re […]

  • An Introduction to Term Frequency – Inverse Document Frequency (tf-idf)

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    tf-idf is one of the most fundamental concepts in information retrieval. It’s the product of 2 statistics, the term frequency (tf), which is the numeric value representing how many times […]

  • Implementing retries with exponential backoff

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    Making a call to an external service might fail for a lot of reasons, sometimes it’s due to network failure, sometimes it’s because the external service is too busy, or […]

  • Executing tasks with the Executor Framework in Java

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    Java offers us many ways to write multi-threading applications, at the early stage, we probably create a new thread for each task by manually extending the Thread class, this seems […]

  • AOC 2022 – Day 5: Supply Stacks

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    You can read the full description for day 5 here. In summary for part 1, we have been provided a number of stacks, each stack may contain a number of […]

  • WebRTC – Go beyond the APIs Part 1: Signaling and Connecting

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    We were in the middle of the pandemic. Many of us have to get accustomed to the new norm, stay at home to work and study, etc.…We are separated and […]

  • Avoiding NullPointerException in Java

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    NullPointerException is one of the most hideous exceptions in Java. It can silently stop the execution of one thread, or it can, fatally terminate the execution of the whole program. […]

  • Introduction to Trie Data Structure

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    Trie is a data structure that is not so popular but is particularly useful when you have to work a lot with strings. It also has different names like a […]

  • Instrumenting Applications with Prometheus

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    Monitoring is an integral part of any non-trivial system, by the monitoring process, we then have an insight into the application performance and status, such as RPM, CPU usage, and […]

  • Covariance and Contravariance (Java)

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    Many programming languages support subtyping, for example, MechanicalKeyboard can be a subtype of Keyboard, and according to the Liskov substitution principle, the MechanicalKeyboard instance should be substitutable everywhere the Keyboard […]

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