Javascript Event Loop

const first = () => console.log('Hi,i am first');
const second = () => console.log('Hi,i am second');
const third = () => console.log('Hi,i am third');
const fourth = () => {
    first();
    setTimeout(second, 4000);
    //store in queue & it will execute after 4 seconds
    setTimeout(third, 2000);
    //store in queue & it will execute after 2 seconds
    console.log('Hi,i am fourth');
};
fourth();

//Expected output:
/*Hi,i am first
  Hi,i am fourth
  Hi,i am third
  Hi,i am second 
*/

Posted by: Guest on September-07-2021

The Event Loop has one simple job — to monitor the Call Stack and the Callback Queue. If the Call Stack is empty, it will take the first event from the queue and will push it to the Call Stack, which effectively runs it. Such an iteration is called a tick in the Event Loop. Each event is just a function callback. #bpn

function task(message) { // emulate time consuming task let n = 10000000000; while (n > 0){ n--; } console.log(message); } console.log('Start script...'); task('Download a file.'); console.log('Done!'); Code language: JavaScript (javascript)

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