Module

Modules and the PowerShell Gallery

Learn how PowerShell packages reusable code into modules and how to discover, install, and publish them via the PowerShell Gallery.

PowerShell for Azure

Use the Az PowerShell module to authenticate, provision, and automate Azure resources at scale.

Modules in Fortran

Packaging types, data, and procedures into reusable, compile-time-checked Fortran modules.

Perl Modules and CPAN

Learn how Perl organizes reusable code into modules and how CPAN gives you instant access to over 200,000 community-tested packages.

Writing Your Own Module

Build, structure, document, test, and package a distributable Perl module from scratch, from the initial .pm file to a CPAN-ready distribution.

Loading and Instantiating a Wasm Module

How to fetch, compile, and instantiate WebAssembly binaries in JavaScript hosts, from raw ArrayBuffers to streaming compilation.

The Wasm Binary Format

A tour of the actual bytes inside a .wasm file: the module header, sections, and how instructions are encoded.

Wasm Module Size Optimization

Practical techniques for shrinking WebAssembly binaries, from compiler flags and Binaryen's wasm-opt to trimming runtime and standard library overhead.

os Module in Python

Explore Python's os module for interacting with the operating system, including file paths, directories, and environment information.

The events Module and EventEmitter

Learn how Node's EventEmitter class enables the observer pattern used throughout the Node.js core APIs.

The fs Module in Node.js

Learn how to read, write, and manage files using Node's built-in fs module with sync, async, and promise-based APIs.

The os Module in Node.js

Explore how to retrieve operating system information like platform, CPU cores, and memory using Node's os module.

The path Module in Node.js

Understand how to build, parse, and normalize file system paths cross-platform using Node's built-in path module.

Writing a Reusable Module

Turning ad-hoc configuration into a well-designed reusable module requires thoughtful input/output design, sensible defaults, and internal structure. This topi…

JavaScript Closures Cheat Sheet

Covers how closures capture variables from their enclosing scope, with practical patterns like private state, memoization, and a classic loop pitfall.

JavaScript Modules (ESM/CJS) Cheat Sheet

Covers ES module import/export syntax, CommonJS require/module.exports, Node.js module configuration, and interoperability between the two systems.

Java Sealed Classes Cheat Sheet

Syntax for sealed, non-sealed, and final permitted subclasses, plus exhaustive pattern matching with switch, as finalized in modern Java.