Run results for: Javascript multi-element splice vs. assign

Run details:

User agent: Mozilla/5.0 (X11; Linux x86_64; rv:152.0) Gecko/20100101 Firefox/152.0

Browser: Firefox 152

Operating system: Linux

Device Platform: Desktop

Date tested: one month ago

Assign at <extent> positions

82.4M/s

Splice at <extent> positions

7.8M/s

View exact numbers

Test name	Executions per second
✓ Assign at <extent> positions	82,401,216 Ops/sec
Splice at <extent> positions	7,782,355 Ops/sec

Script Preparation code:

const arr = new Array(10000).fill(0);
const extent = 10;
const sub = new Array(extent).fill(1);

Tests:

Assign at <extent> positions
for(let i=0; i<extent; i++){ arr[100+i] = sub[i]; }
Splice at <extent> positions
arr.splice(100, extent, ...sub);