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Most JAVA developers are using Maps and especially HashMaps. A HashMap is a simple yet powerful way to store and get data. But how many developers know how a HashMap works internally? A few days ago, I’ve read a huge part of the source code of java.util.HashMap (in Java 7 then Java 8) in order to have a deep understanding of this fundamental data structure. In this post, I’ll explain the implement
When it comes to relational databases, I can’t help thinking that something is missing. They’re used everywhere. There are many different databases: from the small and useful SQLite to the powerful Teradata. But, there are only a few articles that explain how a database works. You can google by yourself “how does a relational database work” to see how few results there are. Moreover, those article
Have you ever wondered how Shazam works? I asked myself this question a few years ago and I read a research article written by Avery Li-Chun Wang, the confounder of Shazam, to understand the magic behind Shazam. The quick answer is audio fingerprinting, which leads to another question: what is audio fingerprinting? When I was student, I never took a course in signal processing. To really understan
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