Run results for: Chunk map vs map only

Run details:

User agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/126.0.0.0 Safari/537.36

Browser: Chrome 126

Operating system: Windows

Device Platform: Desktop

Date tested: one year ago

Test name	Executions per second
Chunk and map 1000	0.3 Ops/sec
Map only	0.3 Ops/sec
Chunk and map 100	0.2 Ops/sec
Chunk and map 10	0.1 Ops/sec

Script Preparation code:

var test = Array.from(
  {
    length: 1000000,
  },
  () => ({
    b: Math.round(Math.random()),
  }),
);

async function addC(item) {
  await new Promise((resolve) => setTimeout(resolve, 5));
  item.c = 9;
  return item;
}

function chunk(arr, chunkSize) {
  const groups = [];
  let i = 0;
  while (i < arr.length) {
    groups.push(arr.slice(i, (i += chunkSize)));
  }
  return groups;
}

async function mapOnly(array, size) {
  await Promise.all(array.map(async (item) => await addC(item)));
  return array;
}

async function chunkAndMap(array, size) {
  const chunks = chunk(array, size);
  await Promise.all(
    chunks.map(async (chunk) => {
      await Promise.all(chunk.map(async (item) => await addC(item)));
    }),
  );
  return array;
}

async function run(fun, arr, chunkSize) {
  await fun(arr, chunkSize);
}

Tests:

Chunk and map 10000
run(chunkAndMap, test, 10000)
Map only
run(mapOnly, test, 1000)
Chunk and map 1000
run(chunkAndMap, test, 1000)
Chunk and map 100
run(chunkAndMap, test, 100)

Run results for: Chunk map vs map only

Chunk and map 10000

Map only

Chunk and map 1000

Chunk and map 100