CORS request path

Var Vs let Vs const

HTTP Status Codes

Cookies Vs Sessions

REST API Cheatsheet

Components of Docker

localStorage Persistence: The Silent Bank Vault

What’s happening?

localStorage is like a browser’s hard drive. It survives tab/window closures, even system reboots.

Unlike sessionStorage (which dies with the tab), localStorage sticks until explicitly cleared (localStorage.clear() or user clears browsing data).

Gotcha: It’s synchronous meaning it blocks the main thread if you store large data.

JavaScript Event Loop: The Truth About setTimeout(0)

The Real Order of Operations:

1. Call Stack: Synchronous code (A, D) - This is where JavaScript executes code sequentially, like reading a script.

2. Microtasks: Promises (C) - These are small tasks that need to be executed ASAP after the current script, before the next rendering. Think of them as urgent side tasks.

3. Macrotasks: Timeouts/Intervals (B) - These are longer tasks that the browser queues up to do whenever it gets a chance. They're not as urgent as microtasks.

Golden Rule: "0ms" doesn't mean immediate - it means "next event loop tick".

Input Types in HTML