Question

How to make a sleep function in Node.js

Answer 1

function sleep(time_ms) {
    return new Promise((resolve) => setTimeout(resolve, time_ms));
}
  
const start = Date.now();
  
sleep(2000).then(() => {
   console.log("Sleep time in ms = " + (Date.now() - start));
})
  
    
  
/*
run:
         
Sleep time in ms = 2002
         
*/

 

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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(3000); // wait 3 seconds
    
   console.log(a * b)
}
  
mul(63, 9);
 
   
    
/*
run:
          
567
        
*/

 

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Answer 3

const start = Date.now();
     
setTimeout(() => {
    console.log("Sleep time in ms = " + (Date.now() - start));
}, 2000);
 
      
/*
run:
        
Sleep time in ms = 2001
        
*/

 

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