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In JavaScript, the callback queue is an essential part of the event loop mechanism, which handles asynchronous operations. The callback queue is responsible for managing and executing callback functions that are scheduled to run after certain events or operations are completed.
How Callback Queue Works
When an asynchronous operation, such as setTimeout, setInterval, or an event listener, is triggered, the associated callback function is placed in the callback queue. The event loop continuously checks the call stack and the callback queue. If the call stack is empty, the event loop takes the first callback function from the callback queue and pushes it onto the call stack for execution.
Here is an example to illustrate the use of setTimeout in JavaScript:
console.log('Start');setTimeout(() => {console.log('Callback 1: Executed after 2 seconds');}, 2000);setTimeout(() => {console.log('Callback 2: Executed after 0 seconds');}, 0);console.log('End');Cóipeáilte!✕CóipeáilOutput:
JavaScript execution model - JavaScript | MDN - MDN Web Docs
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