Benchmark: Array.from() versus checking to see if item is already an array

HTML Preparation code:

<!--your preparation HTML code goes here-->

Tests:

No check to see if there is an array
const [Builder, add] = (Math.random() > 0.5) ? [Array, 'push'] : [Set, 'add']; const collection = new Builder(); for (let i = 0; i < 1000; i++) { collection[add](i); } const result = Array.from(collection);
Check to see if there is an array
const [Builder, add] = (Math.random() > 0.5) ? [Array, 'push'] : [Set, 'add']; const collection = new Builder(); for (let i = 0; i < 1000; i++) { collection[add](i); } const result = Array.isArray(collection) ? collection : Array.from(collection);

Rendered benchmark preparation results:

Previous results

Test case name	Result
No check to see if there is an array
Check to see if there is an array

Latest run results:

Run details: (Test run date: 7 months ago)

User agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10_15_7) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/143.0.0.0 Safari/537.36

Browser/OS: Chrome 143 on Mac OS X 10.15.7

Check to see if there is an array

58K/s

No check to see if there is an array

58K/s

View exact numbers

Test name	Executions per second
✓ Check to see if there is an array	58,432 Ops/sec
No check to see if there is an array	58,276 Ops/sec

Array.from() versus checking to see if item is already an array (version: 1)