Microbenchmark to investigate https://twitter.com/DasSurma/status/927324384238473222

surma.js

// Microbenchmark to investigate https://twitter.com/DasSurma/status/927324384238473222

var isEvenNum = (num = 1) => num !== 0 && num % 2 === 0;
var sqrNum = num => num * num;

var N = 1000;
var arr = [];
for (n = 1; n <= 10000; ++n) arr.push(n);

function multiloops() {
  var result;
  for (var i = 0; i < N; ++i) {
    result = arr.filter(isEvenNum).map(sqrNum);
  }
  return result;
}

console.time('multiloops');
multiloops();
console.timeEnd('multiloops');

function reduce() {
  var result;
  for (var i = 0; i < N; ++i) {
    result = arr.reduce((accum, num) => {
      if (isEvenNum(num)) accum.push(sqrNum(num));
      return accum;
    }, []);
  }
  return result;
}

console.time('reduce');
reduce();
console.timeEnd('reduce');