Simple Javascript (node.js and browser) timers for benchmarking and other development testing

timeit.js

// https://nodejs.org/docs/v0.8.0/api/all.html#all_process_hrtime
const timeitnode = function (name) {
  const start = process.hrtime();
  return {
    stop() {
      const diff = process.hrtime(start);
      console.log('"%s" took %d seconds and %d nanoseconds', name, diff[0], diff[1]);
      // return process.hrtime(start);
    },
  };
};

// https://stackoverflow.com/a/25878121/99923
const timeitbrowser = function (name) {
  const start = new Date();
  return {
    stop() {
      const end = new Date();
      const time = end.getTime() - start.getTime();
      console.log('Timer:', name, 'finished in', time, 'ms');
      // return time
    },
  };
};


// Caculate many runs when you have lots of workers/callbacks and need to time each one 
const AverageTimer = () => {
  const times = [];

  return {
    start() {
      const start = process.hrtime();

      // Closure to allow multiple sub-timers to run
      return {
        stop() {
          times.push(process.hrtime(start));
        },
      };
    },
    report(name) {
      const seconds = Math.round(times.reduce((a, b) => a + b[0], 0) / times.length);
      const nanoseconds = Math.round(times.reduce((a, b) => a + b[1], 0) / times.length);

      console.log(
        '"%s" took %d seconds and %d microseconds',
        name,
        seconds,
        Math.round(nanoseconds / 1000 / 1000),
      );
    },
  };
};



// Caculate average over many runs and display results in milliseconds
const AverageTimer = () => {
  const times = [];

  return {
    start() {
      const start = process.hrtime();

      // Closure to allow multiple sub-timers to run
      return {
        stop() {
          times.push(process.hrtime(start));
        },
      };
    },
    report(name) {
      // Add seconds + nanoseconds
      const total = times.reduce((c, n) => c + (n[0] * 1000) + (n[1] / 1000 / 1000), 0);

      // Pad string for easy comparison of results
      const ms = String(`          ${Math.round(total / times.length)}`).slice(-10);

      console.log('TIMER: %s ms (average) for "%s"', ms, name);
    },
  };
};