http://wiki.carl.fun/ 2026-08-10T21:45:37+00:00 http://wiki.carl.fun/ http://wiki.carl.fun/_media/wiki:dokuwiki.svg text/html 2026-07-30T04:48:46+00:00 carl (carl@undisclosed.example.com) http://wiki.carl.fun/python?rev=1785386926&do=diff Python Python is a programming language common in the data science space. Here is a list of gotchas that I have encountered while using it, coming from a Java world. Wishlist Typesafety is complex. Static checkers are okay, but the runtime type system is pretty weak. There is no equivalent of type capture in Java (e.g. text/html 2026-07-13T19:06:07+00:00 carl (carl@undisclosed.example.com) http://wiki.carl.fun/grpc?rev=1783969567&do=diff gRPC Status Codes Status codes are intentionally vague, to enable automatic processing by code. There are not 5 different flavors of internal errors. This is balance between being precise, and being automatable. Additionally, status codes intentionally do not indicate if they originated from the client or server. text/html 2026-07-10T16:51:57+00:00 carl (carl@undisclosed.example.com) http://wiki.carl.fun/start?rev=1783702317&do=diff Hi, I'm Carl. This site is a list of my notes. * Java Notes, particularly around concurrency. * Python Notes, particularly around type-safety and runtime stuff * Numeric Numerical properties in computers. * General Programming Notes on general programming concepts * Logs and Metrics Logs and Metrics text/html 2026-07-10T07:43:08+00:00 carl (carl@undisclosed.example.com) http://wiki.carl.fun/futures?rev=1783669388&do=diff Futures Futures are a complex, heterogeneous feature. Each language handles them slightly differently. Most of the discussion here is for Java. A future has 3 parties involved in the lifecycle. * The Scheduler. This party (thread) usually creates the future object. The scheduler is the one that sets up the fulfillment of the future. text/html 2026-07-10T07:42:40+00:00 carl (carl@undisclosed.example.com) http://wiki.carl.fun/java:futures?rev=1783669360&do=diff Futures Java has 2 main Future implementations: CompletableFuture and FutureTask. They both implement the Future interface. Additionally ForkJoinTask implements Future but this is less managable. CompletableFuture CompletableFuture is a full featured Future implementation, capable of chaining and joining. However, its main weakness is that cancellation doesn't stop the underlying computation, and interruption is not supported. text/html 2026-07-10T07:27:18+00:00 carl (carl@undisclosed.example.com) http://wiki.carl.fun/logs_and_metrics?rev=1783668438&do=diff Logs and Metrics Often logs and metrics appear to be interchangeable with one another. This page covers differences between them, and when to use them, Logs vs. Metrics * Logs have precise timestamps. To compare the order of events, you need to look at logs. Metrics are usually aggregated locally at seconds or minute granularity, making it challenging to establish an order. Traces are even more precise. text/html 2026-07-08T01:10:27+00:00 carl (carl@undisclosed.example.com) http://wiki.carl.fun/programming?rev=1783473027&do=diff General Programming Ternary Operators Are there any non-conditional ternary operators? As asked here, The answer there suggests that no, there are no ternary operators, and you might as well call a function. However, upon thinking more, unary and binary operators make sense because they naturally split a linear progression of text. A binary operator conjoins the text/html 2026-06-23T17:12:53+00:00 carl (carl@undisclosed.example.com) http://wiki.carl.fun/java:wishlist?rev=1782234773&do=diff Wishlist This is a collection of things I'd like from Java. Many other languages, runtimes, and libraries have made improvements that I think would help the Java ecosystem. PriorityQueue PriorityQueue Reprioritize Items Go allows modifying the priority of an item in a PriorityQueue. Java's doesn't allow this in an efficient manner. Instead, you need to remove the item (linear time), and re-enqueue it. text/html 2026-03-14T21:01:58+00:00 carl (carl@undisclosed.example.com) http://wiki.carl.fun/numeric?rev=1773522118&do=diff Numeric Types Numeric types represent Real numbers in a computer. Because computers have limited space, most numeric values are approximations of a real value. Math in a computer is a combination of a storage of data, and a collection of operators. Interpretation of the bits is up to the operators. When we talk about a type of a number, we are usually referring to the operations we can do on them, rather than the storage.