Web development

preventDefault() vs stopPropagation() vs stopImmediatePropagation() When to Use What: 📌preventDefault(): When you want to handle the action yourself 📌 stopPropagation(): When parent elements shouldn't react 📌 stopImmediatePropagation(): Nuclear option for plugin conflicts 90% of the time, you only need preventDefault().

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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".

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.

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