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javascript time execution

var t0 = performance.now();

doSomething();   // <---- The function you're measuring time for 

var t1 = performance.now();
console.log("Call to doSomething took " + (t1 - t0) + " milliseconds.");
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javascript time execution

console.time("My Descriptive Title");

doSomething(); // <--- the function that you want to time

console.timeEnd("My Descriptive Title"); // Argument has to match

// My Descriptive Title: 8917.283ms
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javascript time of execution

const { JSDOM } = require("jsdom");
const { window } = new JSDOM();
 
var start = window.performance.now();
 
// task starts
for (var i = 0; i < 100000000;i++);
// task ends
 
var end = window.performance.now();
console.log(`Execution time: ${end - start} ms`);
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execution time in javascript program

program execution time in javascript
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