Array `.map()` vs `.reduce()`

map-vs-reduce.js

const size = 250_000;
const input = new Array(size).fill(undefined).map((_, index) => index);

[
  {
    name: '.map()',
    fn: () => {
      input.map((e) => e * 2);    
    }
  },

  {
    name: '.reduce() and .push()',
    fn: () => {
      input.reduce((acc, e) => { acc.push(e * 2); return acc; }, new Array());
    }
  },

  {
    name: '.reduce() and new Array()',
    fn: () => {
      input.reduce((acc, e, index) => { acc[index] = e * 2; return acc; }, new Array(input.length));
    }
  },
].forEach(({ name, fn }) => {
  const iterations = 2_000;

  console.time(name);
  for (let i = 0; i < iterations; ++i) {
    fn();
  }
  console.timeEnd(name);
});