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What’s the difference between let and var in JavaScript?

Asked on Saturday, Jan 31, 2026

In JavaScript, "let" and "var" are both used to declare variables, but they differ in terms of scope and hoisting behavior. // Example of 'let' and 'var' scope function example() { if (true) { let blo…

How can I prevent memory leaks when using closures in JavaScript?

Asked on Friday, Jan 30, 2026

Closures in JavaScript can potentially lead to memory leaks if not managed properly, especially when they unintentionally retain references to variables that are no longer needed. To prevent memory le…

How can I prevent default form submission in JavaScript?

Asked on Thursday, Jan 29, 2026

To prevent the default form submission in JavaScript, you can use the "preventDefault" method within an event listener for the form's "submit" event. document.querySelector('form').addEventListener('s…

How can I debounce a function to limit its execution rate in JavaScript?

Asked on Wednesday, Jan 28, 2026

Debouncing is a technique used to limit the rate at which a function is executed by delaying its execution until after a specified wait time has elapsed since the last time it was invoked. function de…