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Fran Academy

Day 1: Asynchronous JS & The Event Loop

Daily Objective

Section titled “Daily Objective”

Understand how JavaScript executes asynchronous code using the Call Stack, Web APIs, and the Event Loop.

1. How Does Async JavaScript Work?

Section titled “1. How Does Async JavaScript Work?”

JavaScript is single-threaded (one call stack). Long-running operations (network requests, timers) are delegated to the browser’s Web APIs. When complete, their callbacks join the Task Queue, which the Event Loop pushes to the call stack when empty.

Daily Hands-on Practice (70%)

Section titled “Daily Hands-on Practice (70%)”
  1. Predict the console order of console.log(1), setTimeout(..., 0), and console.log(2). Run it to verify!