Programming languages (Python, JavaScript, C++, Go, Rust, Java) and their frameworks and libraries.
std::any (C++17) is a type-safe container for single values of any type. It lets you store an int, string, custom struct, or vector in the same variable without losing type information—unlike void* pointers, which are inherently unsafe. How It Works std::any uses type erasure: it wraps whatever you give it, remembers the exact type, and…
Resource Acquisition Is Initialization (RAII) is a fundamental programming idiom in C++ that ties the lifecycle of a resource—memory, file handles, network sockets, database connections, locks—to the lifecycle of an object. When the object is created, the resource is acquired. When the object is destroyed and goes out of scope, the resource is automatically released….
RTTI is a C++ mechanism that allows you to determine an object’s type at runtime. It’s essential when working with polymorphism and inheritance hierarchies, but it comes with trade-offs you need to understand. Key RTTI Operators typeid() — Returns a std::type_info object representing the type. You can compare type information or get a human-readable name…
Unlike Python or JavaScript, C++ doesn’t provide a built-in split() method for strings. You’ll need to use library functions or write your own utility. The best approach depends on your compiler version, performance requirements, and whether you’re handling edge cases. The Classic Approach: find() and substr() The most straightforward method uses std::string::find() to locate delimiters…
std::vector is the right default choice for almost every container need in C++. It’s the foundation of high-performance applications—game engines, financial systems, data processing pipelines—because it aligns with how modern CPUs actually work. Cache Locality Drives Performance std::vector stores elements in contiguous memory. When you iterate, the CPU prefetches the next elements into L1/L2 cache,…
When working with paired data across multiple lists—like x and y coordinates—you often need to sort one list while maintaining the correspondence with another. The standard approach is using zip(), sorted(), and tuple unpacking. The Pattern Given two lists: x = [3, 5, 6, 1, 2] y = [6, 7, 8, 9, 10] To sort…
Go’s standard library provides everything needed to generate RSA key pairs and save them in PEM format. Here are the essential packages: crypto/rsa — Implements RSA encryption per PKCS #1 and RFC 8017. The GenerateKey() function creates a keypair of specified bit size. crypto/rand — Provides Reader, a cryptographically secure random source. On Linux, it…
Google Docs comments are invaluable for collaborative work, but the web interface doesn’t provide a native way to print them in document margins. The most reliable approach is to export the document and use LibreOffice or Microsoft Word to handle the layout. Download the Document from Google Docs Open your Google Doc and go to…
Converting integers to strings is a frequent operation in C++ programs. Modern C++ provides several approaches, each with different trade-offs in simplicity, performance, and flexibility. Using std::to_string() (Recommended) The standard library function std::to_string() (C++11 and later) is the most straightforward approach for most use cases: #include <iostream> #include <string> int main() { int n =…
Counting words in a file is a straightforward task in PHP, but the approach varies depending on file size and memory constraints. Here are the most practical methods. Simple Approach with str_word_count() For small to medium files, load the entire file and use str_word_count(): $content = file_get_contents(‘myfile.txt’); $wordCount = str_word_count($content); echo “Total words: $wordCount\n”; This…
Python 3.9 brought several substantial improvements over earlier versions. While it’s now past EOL as of October 2025, understanding its features provides context for migration planning and why the Python ecosystem shifted toward 3.10+. That said, if you’re maintaining legacy 3.9 code, these features remain relevant to your codebase. Dictionary Merge and Update Operators The…
Type conversion is a constant necessity when handling user input, database results, and API responses in PHP. While PHP’s loose typing offers flexibility, explicit conversion remains essential for security, performance, and code clarity. Integer to String Conversion Several methods convert integers to strings: Casting is the most direct approach: $myInt = 42; $str = (string)…
The StoneWall problem is a classic algorithmic challenge that tests your ability to recognize when a stack data structure enables a greedy O(N) solution. The Problem Given an array of wall heights, determine the minimum number of distinct stone blocks needed to construct that height profile. Each stone block can be placed multiple times at…
Google’s dominance didn’t happen by accident. The company built systematic practices around innovation that kept it ahead for decades. For sysadmins, engineering leads, and technical teams, several of these principles translate directly into better infrastructure practices, faster problem-solving, and stronger team dynamics. Acquisitions as Strategic R&D Google has acquired over 216 companies across 22 countries….
Python’s standard library includes zoneinfo, which handles timezones correctly without external dependencies. Use it for all new code. from datetime import datetime from zoneinfo import ZoneInfo utc_time = datetime.now(ZoneInfo(“UTC”)) ny_time = utc_time.astimezone(ZoneInfo(“America/New_York”)) print(ny_time) This automatically manages Daylight Saving Time transitions. The IANA timezone database (via the tzdata package on Windows; built-in on Unix-like systems) backs…
Go doesn’t have a dedicated FileExists() function. Instead, use os.Stat() to retrieve file metadata and inspect the error type to determine what actually happened. Basic File Existence Check import “os” func fileExists(path string) bool { _, err := os.Stat(path) return !os.IsNotExist(err) } os.Stat() returns an error only if something goes wrong. The key is using…
The simplest way to convert a string to lowercase is using the lower() method: >>> “Hello World”.lower() ‘hello world’ >>> “ABC”.lower() ‘abc’ >>> “abc”.lower() ‘abc’ The lower() method returns a new string with all uppercase characters converted to lowercase. The original string remains unchanged — strings are immutable in Python. Basic Usage text = “Python…
PHP lets you call functions dynamically when you don’t know the function name until runtime. This is essential for plugin systems, routing handlers, API dispatchers, and configuration-driven logic. The approach you choose affects both performance and safety. Direct Variable Function Invocation The simplest approach treats a string variable as a callable: $func = ‘strlen’; echo…
The built-in pdb module is Python’s equivalent to gdb — a command-line debugger that lets you step through code, set breakpoints, inspect variables, and control execution flow. It’s essential for server-side debugging and situations where IDE graphical debuggers aren’t available. Starting a pdb Session Run a script through pdb directly: python -m pdb prog.py arg1…
In Linux, everything is a file—including hardware devices. Block devices like disks, SSDs, and USB drives appear as files in /dev and handle I/O in fixed-size blocks. You need reliable ways to detect them in your Python scripts, especially when automating storage operations. Using pathlib (Recommended) Python 3.4+ provides pathlib.Path.is_block_device(), which is the modern standard:…