Question

How to run while loop for N seconds in JavaScript

Answer 1

const sleep = (ms) => new Promise(resolve => setTimeout(resolve, ms));
 
(async function() {
    let starttime = Date.now();
    const seconds = 3 * 1000; // Convert seconds (3) to milliseconds
    const endtime = starttime + seconds;
 
    while (starttime < endtime) {
        await sleep(1000); // Sleep for 1 second
        starttime = Date.now();
        console.log(new Date(starttime).toString());
    }
})();
 
 
/*
run:
 
Fri Oct 11 2024 09:04:58 GMT+0000 (Coordinated Universal Time)
Fri Oct 11 2024 09:04:59 GMT+0000 (Coordinated Universal Time)
Fri Oct 11 2024 09:05:00 GMT+0000 (Coordinated Universal Time)
 
*/

 

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Answer 2

function sleep(seconds) {
    seconds = (+new Date) + seconds * 1000;
    while ((+new Date) < seconds);
}
 
let startTime = Date.now(); // Get the current time
const duration = 3000; // Duration in milliseconds (e.g., 3000ms = 3 seconds)
const endtime = startTime + duration;
  
while (startTime < endtime) {
    sleep(1); // Sleep for 1 second
    startTime = Date.now();
    console.log(new Date(startTime).toString());
}
         
 
/*
run:
 
Fri Oct 11 2024 09:47:45 GMT+0000 (Coordinated Universal Time)
Fri Oct 11 2024 09:47:46 GMT+0000 (Coordinated Universal Time)
Fri Oct 11 2024 09:47:47 GMT+0000 (Coordinated Universal Time)
 
*/

 

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