BEGIN

Message Maps

How MFC's message-map macros build a static dispatch table that replaces a hand-written WndProc, plus how command routing and UI updates work on top of it.

BEGIN and END Blocks

BEGIN runs once before any input is read and END runs once after all input is consumed, giving AWK programs a clean place for setup, headers, and final aggrega…

Serial Communication Basics

Use the Serial library to send data between Arduino and a computer for debugging, monitoring sensors, and receiving commands.

Exception Handling in Ruby

Understand Ruby's begin/rescue/ensure/raise vocabulary for handling errors gracefully, including exception hierarchies, retry, and best practices for robust co…