Run results for: push vs set length and index

Run details:

User agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/135.0.0.0 Safari/537.36 Edg/135.0.0.0

Browser: Chrome 135

Operating system: Windows

Device Platform: Desktop

Date tested: one year ago

Benchmark engine: Benchmark.js

index

3K/s

push

650/s

View exact numbers

Test name	Executions per second
✓ index	2,651 Ops/sec
push	650 Ops/sec

Tests:

push
const arr = [] const length = 100000 for(let i = 0; i < length; i++) { arr.push(i, 1) } console.log(arr[0], arr[100], arr[1000], arr[10001], arr[20000])
index
const arr = [] const length = 100000 arr.length = length*2+1 for(let i = 0; i < length; i++) { arr[i*2] = i; arr[i*2+1] = 1; } console.log(arr[0], arr[100], arr[1000], arr[10001], arr[20000])