Question

How to measure execution time of a block of code in JavaScript

Answer 1

let starttime = performance.now();
 
for (let i = 1, n = 0; i <= 10000000; i++) {
  n += i;
}
 
let endtime = performance.now();
 
let time = endtime - starttime; 
 
console.log(time + " ms");
   
   
 
 
     
/*
run:
     
"8 ms"
     
*/

 

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Answer 2

let starttime = new Date().getTime();

for (let i = 1, n = 0; i <= 10000000; i++) {
  n += i;
}

let endtime = new Date().getTime();

let time = endtime - starttime; 

console.log(time + " ms");
  
  


    
/*
run:
    
"9 ms"
    
*/

  

 

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