Benchmarking JavaScript - Setting up a timer

benchmark.js

let iterations = 100000;
let startTime = new Date().getTime();

for (let i = 0; i < iterations; i++)
  Math.log10(0)

let endTime = new Date().getTime();
let time = endTime - startTime;

console.info(`time: ${time}ms, op: ${time / iterations}ms`);