heavy-computation.js

heavy-computation.js

// TODO: in a single threaded JavaScript world (both in the browser and Node)
// how would you make the displaySum non-blocking?

var displaySum = function outputSumOfEvenNumbers(stopAt) {
  var sum = 0;

  for (var i = 0; i < stopAt; i++) {
    if (i % 2 === 0) {
      sum += i;
    }
  }

  console.log('sum === %s', sum);
  clearInterval(interval);
};

var interval = setInterval(function() {
  console.log("I'm alive!!");
}, 200);

console.time('sum took');
displaySum(199999999);
console.timeEnd('sum took');

What's the point of running the interval and then do the calculation afterwards?