The invokespecial JVM instruction is used for calling initialisation methods (<init>) when creating new objects. The description of the instruction suggests (but doesn't clarify) that the decision on whether to call the constructor of a superclass or a constructor of the current class depends on the state of the ACC_SUPER flag set within the class file. From the Sun JVM Specification: Next, the re
I saw this quote on the question: What is a good functional language on which to build a web service? Scala in particular doesn't support tail-call elimination except in self-recursive functions, which limits the kinds of composition you can do (this is a fundamental limitation of the JVM). Is this true? If so, what is it about the JVM that creates this fundamental limitation?
I've recently been looking at The Java Virtual Machine Specifications (JVMS) to try to better understand the what makes my programs work, but I've found a section that I'm not quite getting... Section 4.7.4 describes the StackMapTable Attribute, and in that section the document goes into details about stack map frames. The issue is that it's a little wordy and I learn best by example; not by readi
I have a Git repository and I'd like to see how some files looked a few months ago. I found the revision at that date; it's 27cf8e84bb88e24ae4b4b3df2b77aab91a3735d8. I need to see what one file looks like, and also save it as a ("new") file. I managed to see the file using gitk, but it doesn't have an option to save it. I tried with command-line tools, the closest I got was: git-show 27cf8e84bb88e
Say we have var i = [0, 1, 2, 3, 4, 5, 6, 7, 8, 9]; and want to reduce() it like var plus = function(a, b) { return a + b; }; var s = [0, 1, 2, 3, 4, 5, 6, 7, 8, 9] .reduce(plus); console.log(s); Now, I want to compose reduce() function itself from map() function. How would you do that? What is the smartest way? Edit: In the comments and answers, many have claimed fold/reduce can compose map, in s
This question is for the people who know both Haskell (or any other functional language that supports Higher-kinded Types) and C++... Is it possible to model higher kinded types using C++ templates? If yes, then how? EDIT : From this presentation by Tony Morris: Higher-order Polymorphism : Languages such as Java and C# have first-order polymorphism because they allow us to abstract on types. e.g.
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