Comments

Comments in Batch Files

How to write and use comments in batch files, and why documentation matters for long-lived scripts.

T-SQL Syntax Basics

Core T-SQL syntax rules — statements, batches, comments, identifiers, and control-of-flow — you need before writing real queries.

Your First MATLAB Script

How to create, save, and run a MATLAB script file, and the basic building blocks -- comments, output, and simple control flow -- used inside one.

Comments in C++

Learn what comments are in C++, the difference between single-line and multi-line comments, and best practices for using them.

Comments in Java

Learn the three types of comments in Java — single-line, multi-line, and Javadoc — and best practices for using them.

Comments in Python

How to write single-line and multi-line comments in Python, and the difference between comments and docstrings.

Comments in JavaScript

Learn how to write single-line and multi-line comments in JavaScript to document and disable code.

Ruby Comments and Documentation

How to write single-line and multi-line comments in Ruby, and how to document code using RDoc/YARD conventions for generated API docs.