You can use the console.time() and console.timeEnd() methods to measure how long a function or operation in your code takes to complete. You call console.time() at the point in your code where you want to start the timer and console.timeEnd() to stop the timer. The elapsed time between these two calls is displayed in the console. see: https://de…

JS-code-timer

console.time("Array initialize");
// code to measure
var array= new Array(1000000);
for (var i = array.length - 1; i >= 0; i--) {
    array[i] = new Object();
};
console.timeEnd("Array initialize");

// console results = Array initialize: 461.127ms