Question

How to make a sleep function in JavaScript

Answer 1

function sleep(time_ms) {
    return new Promise((resolve) => setTimeout(resolve, time_ms));
}
 
const start = Date.now();
 
sleep(1000).then(() => {
   console.log("Sleep time in ms = " + (Date.now() - start));
})
 
   
 
/*
run:
        
Sleep time in ms = 1001
        
*/

 

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Answer 2

function sleep(time_ms) {
    return new Promise((resolve)=>setTimeout(resolve, time_ms));
}
 
async function mul(a, b) {
   await sleep(2000); // wait 2 seconds
   
   console.log(a * b)
}
 
mul(56, 8);

  
   
/*
run:
         
448
       
*/

 

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Answer 3

const start = Date.now();
    
setTimeout(() => {
    console.log("Sleep time in ms = " + (Date.now() - start));
}, 1000);

     
/*
run:
       
Sleep time in ms = 1001
       
*/

 

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