#Event Loop

Explain the JavaScript Event Loop.

Describe what happens from the moment a user clicks 'Pay Now' until the network request leaves the browser, including aspects of the event loop and microtasks.

Explain JavaScript fundamentals including the event loop, call stack, and task queue with a live example. Additionally, write a polyfill for Promise.all that handles both resolve and reject cases, followed by a discussion on how Promise.allSettled differs from Promise.all and its use cases.

Explain the event loop in JavaScript and differentiate between the call stack, microtasks, and macrotasks.

Explain closures, hoisting, the event loop, and the 'this' keyword in JavaScript. Discuss their importance in modern JavaScript development.