Run results for: Spread with map vs Array.from()

Run details:

User agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10.15; rv:137.0) Gecko/20100101 Firefox/137.0

Browser: Firefox 137

Operating system: Mac OS X 10.15

Device Platform: Desktop

Date tested: 15 days ago

Test name	Executions per second
Spread with map	255795.8 Ops/sec
Array.from with map	200779.9 Ops/sec
Array.from with second parameter	193804.4 Ops/sec
for loop push	195997.8 Ops/sec
for loop pre-allocate	204997.3 Ops/sec
for loop pre-allocate cached length	349271.3 Ops/sec

HTML Preparation code:

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Script Preparation code:

const nodeList = document.querySelectorAll('div');

Tests:

Spread with map
const result = ([...nodeList]).map((node) => node.id);
Array.from with map
const result = Array.from(nodeList).map((node) => node.id);
Array.from with second parameter
const result = Array.from(nodeList, (node) => node.id);
for loop push
const result = []; for (let i = 0; i < nodeList.length; i++) { result.push(nodeList[i].id); }
for loop pre-allocate
const result = new Array(nodeList.length); for (let i = 0; i < nodeList.length; i++) { result[i] = nodeList[i].id; }
for loop pre-allocate cached length
const length = nodeList.length; const result = new Array(length); for (let i = 0; i < length; i++) { result[i] = nodeList[i].id; }

Run results for: Spread with map vs Array.from()

Spread with map

Array.from with map

Array.from with second parameter

for loop push

for loop pre-allocate

for loop pre-allocate cached length