Synchronous vs Asynchronous JavaScript

Why JavaScript doesn't just wait around — and how that changes everything about how you write code. Let me tell you about the moment asynchronous JavaScript broke my brain. I wrote this code, fully expecting it to print in order: console . log ( " First " ); setTimeout (() => console . log ( " Second " ), 0 ); console . log ( " Third " ); I expected: First → Second → Third. I got: First → Third → Second. Zero milliseconds of delay, and "Second" still printed last. I stared at my screen thinking