benchmark function for comparing performances in javascript

benchmark.js

function benchmark(testName, callback) {
  const startTime = performance.now();
  callback();
  const endTime = performance.now();
  console.log(testName, `time: ${endTime - startTime}`);
}


// usage
function addNums(a, b) {
  return a + b;
}

benchmark("addNums", () => addNums(10, 20));