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Discover clear, example-based answers to real JavaScript challenges. From functions, arrays, and DOM manipulation to ES6+ syntax and async programming, every response is written to help you understand how and why things work. Whether you’re building interactive sites or learning core logic, these Q&As make JavaScript easier and more powerful.

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What are the differences between `var`, `let`, and `const` in JavaScript?

Asked on Tuesday, May 19, 2026

In JavaScript, "var", "let", and "const" are used to declare variables, but they have different scopes and characteristics. Here's a concise explanation with a code example: // var example var x = 1; …

What are the differences between let and var in JavaScript scope?

Asked on Monday, May 18, 2026

In JavaScript, "let" and "var" are used to declare variables, but they have different scoping rules. "let" is block-scoped, while "var" is function-scoped. function testVar() { if (true) { var x = 1; …

What is the difference between localStorage and sessionStorage in JavaScript?

Asked on Sunday, May 17, 2026

LocalStorage and sessionStorage are both part of the Web Storage API, allowing you to store data in the browser. The key difference is in their persistence and scope. // Store data in localStorage loc…

How can I debounce a function to limit how often it runs during rapid events?

Asked on Saturday, May 16, 2026

Debouncing is a technique to limit how often a function is executed during rapid events by delaying its execution until a specified time has passed since the last event. Here's a simple implementation…