Javascript / Node.js tricks

js-node-js-tricks.md

Moment.js durations

var moment = require('moment-timezone');

var _timeConsumingFunc = () => {
  // wait a few seconds
  for (i = 0; i < 1000000000; i++) { 
    // do nothing
  }
}

var _promiseChainFunc = () => {
  var start = moment.tz('Europe/London');
  return Promise.resolve()
    .then(() => {
      return _timeConsumingFunc();
    })
    .then(() => {
      const duration = moment.tz('Europe/London').diff(start, 'seconds', true);
      console.log(`The elapsed time: ${duration}`);
    });
};

_promiseChainFunc();