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Although there were older precursors, the influential French mathematician Rene Descartes is usually credited for introducing superscripted exponents (ab) into mathematical writing, in his work Geometrie which was published in 1637. This is the notation still universally used in mathematics today. Fortran is the oldest programming language widely used for numerical computations that provides an ex
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I've taken a deep dive into the world of parsers recently, wanting to create my own programming language. However, I found out that there exist two somewhat different approaches of writing parsers: Parser Generators and Parser Combinators. Interestingly, I have been unable to find any resource that explained in what cases which approach is better; Rather, many resources (and persons) I queried abo
The Clean Architecture suggests to let a use case interactor call the actual implementation of the presenter (which is injected, following the DIP) to handle the response/display. However, I see people implementing this architecture, returning the output data from the interactor, and then let the controller (in the adapter layer) decide how to handle it. Is the second solution leaking application
I'm currently trying to build my first solution following DDD principles. Until recently everything was more or less clear, but now I have a task to import configuration data for my application and I am not sure what would be a best place to fit such a functionality... I have a sales analysis application, and at some moments there is a need to renew price list data (add new/delist products, or upd
I read the original text of Apache License, Version 2.0 and the explanation in plain English. OK, I copy a class distributed by The Best Company in the World, their license, and modify the code a bit. The original file with my changes. /* * Copyright (C) 2011 The Best Company in the World * * Licensed under the Apache License, Version 2.0 (the "License"); * you may not use this file except in comp
These terms got mentioned in my university course. Quick googling pointed me to some university papers, but I am looking for a simple explanation.
HTML4 / XHTML1 allows only GET and POST in forms, now it seems like HTML5 will do the same. There is a proposal to add these two but it doesn't seem to be gaining traction. What were the technical or political reasons for not including PUT and DELETE in HTML5 specification draft?
I’ve been hearing about the London style vs. Chicago style (sometimes called Detroit style) of Test Driven Development (TDD). Workshop of Utah Extreme Programming User's Group: Interaction-style TDD is also called mockist-style, or London-style after London's Extreme Tuesday club where it became popular. It is usually contrasted with Detroit-style or classic TDD which is more state-based. Jason Go
There has been a lot of discussion lately about the problems with using (and overusing) Singletons. I've been one of those people earlier in my career too. I can see what the problem is now, and yet, there are still many cases where I can't see a nice alternative - and not many of the anti-Singleton discussions really provide one. Here is a real example from a major recent project I was involved i
Regarding source folder hierarchy, there are always some common features, such as the src, doc or test folders, which have rather easy-to-understand contents. However, I realized that big projects have both a lib and vendor folders, while I had always thought they were the same, as their names hint at including “third-party libraries from external vendors”. Though, seeing both in the same project
Often, in libraries especially, packages contains classes that are organized around a single concept. Examples: xml, sql, user, config, db. I think we all feel pretty naturally that these packages are correct in the singular. com.myproject.xml.Element com.myproject.sql.Connection com.myproject.user.User com.myproject.user.UserFactory However, if I have a package that actually contains a collection
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Almost every article I've read 1 comparing Git and Mercurial it seems like Mercurial has a better command line UX with each command being limited to one idea only (unlike say git checkout). But at some point Git suddenly became looking super popular and number of Git submitters on Debian popcon graph (see graph image below) literally exploded. Source: Debian What happened in 2010-01 that things su
I have recently seen a few URIs containing the query parameter "utf8=✓". My first impression (after thinking "mmm, looks cool") was that this could be used to detect a broken character encoding. So, is this a better way to resolve potential problems with character encoding, or is it just a developer having fun with a hack?
Which hashing algorithm is best for uniqueness and speed? Example (good) uses include hash dictionaries. I know there are things like SHA-256 and such, but these algorithms are designed to be secure, which usually means they are slower than algorithms that are less unique. I want a hash algorithm designed to be fast, yet remain fairly unique to avoid collisions.
Why is 80 characters the "standard" limit for code width? Why 80 and not 79, 81 or 100? What is the origin of this particular value?
I'm going to ask what is probably quite a controversial question: "Should one of the most popular encodings, UTF-16, be considered harmful?" Why do I ask this question? How many programmers are aware of the fact that UTF-16 is actually a variable length encoding? By this I mean that there are code points that, represented as surrogate pairs, take more than one element. I know; lots of applications
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