In TypeScript (and JavaScript), both substr and substring are methods used to extract parts of a string, but they behave differently. This probably does not beat standard C++ class mt19937, […]
TypeScript allows passing class methods to functions that expect a lambda, but it won’t work at runtime. Consider this code: Suppose we have class Calculator like this: We can then […]
This is a follow up on this post. Default parameters are not the only way to do complex calculations in Python lambdas. Another idea is to use tuples and the […]
TL;DR On the client side, use trailing slash when requesting the “default” resource from a Flask app. Server: Client: Why it matters In Production If you make a request without […]
Summary WSGIApplicationGroup is a name of the Python sub-interpreter. You don’t need sub-interpreters if you run mod_wsgi in daemon mode (i.e. with dedicated processes). Always set WSGIApplicationGroup to %{GLOBAL}. If […]
TL;DR Under certain circumstances you won’t be able to access an HTTPS site with invalid certificate from Chrome, unless you type a magic cheat code “thisisunsafe“. I was debugging a […]
I took interest in C++ random number generation because of the concept of regular_invocable. To my understanding, regular_invocable is C++’s notion of a “pure function”, or something really close to […]
It’s pretty old stuff, but still… Here’s how you typically generate a random number in C++: Let’s dissect it a little. On the one hand, “random_device” is a rather nebulous […]
Summary Unlike many other languages, Python allows abstract static methods (see the reference). A class directly or indirectly deriving from abc.ABC cannot be instantiated, unless all its abstract methods are […]
![Are Python strings UTF-8? What is the complexity of s[n]?](https://ikriv.com/blog/wp-content/uploads/2025/03/string_encoding_comparison.png)
TL;DR Internally CPython stores strings with fixed character size of 1, 2, or 4 bytes, depending on the string [PEP-393]. The indexing operator s[n] takes constant time. UTF-8 representation can […]
