example1.ts

const COUNT = Number.parseInt(process.argv[2] || "10");
console.log(`Running ${COUNT} iterations.`);

let value = 0;
function benchA() { value = value === 0 ? 0 : 1; }
function benchB() { value = value === 0 ? 0 : 2; }
function benchC() { value = value === 0 ? 0 : 3; }
function benchD() { value = value === 0 ? 0 : 4; }

//benchmark('-------------------------- IGNORE --------------------------', benchA);

benchmark('A', benchA);
benchmark('B', benchB);
benchmark('C', benchC);
benchmark('D', benchD);

/////////////////////

function benchmark(name: string, fn: ()=> void) {
  console.log('Starting:', name, '...');
  const start = Date.now();
  for(let i=0; i<COUNT; i++) {
    fn();
  }
  const duration = Date.now() - start;
  console.log('         ' , name, Number(duration/COUNT*1000*1000).toFixed(3), 'us');
}