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Java’s type system disagrees with itself about one question: if String is an Object, is String[] an Object[]? Arrays say yes. Generics say absolutely not. Both answers were deliber...
List<String> and List<Integer> are the exact same class once the JVM gets involved. Here’s why Java made that trade, and what it still costs today. Ask a Java developer...
Ask four different languages “what was T, once my code actually runs?” and you get four genuinely different answers. Each one is a real trade between flexibility and cost, not a mi...
Java 8 gave interfaces actual behavior, then had to answer the same question C++ has been arguing about for thirty years. It answered it much better. The exact compiler rules, veri...
Practice reified with a short kotlin challenge.
Three languages, three solutions to “different types, same operation” and three very different opinions about who gets to decide what an implementation means. Every mainstream type...
Java, Rust, Scala, and Haskell all let you say “a Shape is exactly a Circle, a Square, or a Triangle, and nothing else.” They disagree sharply on what happens when you forget to ha...
If you’ve ever looked at Kotlin code and wondered why some generic classes use out, others use in, and many use neither, you're not alone.Continue reading on Medium »
Adding a new type is trivial in object-oriented code. Adding a new operation is trivial in functional code. Nobody has ever gotten both for free, and understanding why explains a l...
Arrays in Java are fundamental data structures used to store elements of the same type sequentially in memory. They provide a convenient way to manage collections of data where eac...
Same interface, two unrelated types, two completely different rules about what counts as a match. Imagine an interface called Movable, with nothing more exotic than an x coordinate...
Practice generics with a short swift challenge.
What the new value keyword actually changes about heap layout, and why data-heavy Java applications should pay attention. For more than a decade, Java developers have lived with a...
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