Run results for: forEach.Map.set() vs new Map()

Run details:

User agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/121.0.0.0 Safari/537.36

Browser: Chrome 121

Operating system: Windows

Device Platform: Desktop

Date tested: 2 years ago

Benchmark engine: Benchmark.js

Set individually

1.2M/s

Create with properties

1.1M/s

View exact numbers

Test name	Executions per second
✓ Set individually	1,212,811 Ops/sec
Create with properties	1,129,559 Ops/sec

Script Preparation code:

var chars = [...'abcdefghijklmnopqrstuvwxyz'];

function setIndividually(arr) {
  return arr.reduce((acc, cur) => {
    acc.set(cur, { char: cur });

    return acc;
  }, new Map());
}

function createWithProperties(arr) {
  const props = arr.map(elem => [elem, { char: elem }]);

  return new Map(props);
}

Tests:

Set individually
var foo = setIndividually(chars);
Create with properties
var bar = createWithProperties(chars);