Run results for: JS Array Mutation Test

Run details:

User agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/123.0.0.0 Safari/537.36

Browser: Chrome 123

Operating system: Windows

Device Platform: Desktop

Date tested: 2 years ago

Test name	Executions per second
Mutate	861.2 Ops/sec
Copy & Shift	14772017.0 Ops/sec

Script Preparation code:

const n = 10000
var arr = new Array(n).fill(0);
for (let i = 0; i < n; i++) {
  arr[i] = i;
}

Tests:

Mutate
for (let i = 0; i < arr.length; i++) { arr[i] = i * 2; }
Copy & Shift
const copy = []; for (let i = 0; i < arr.length; i++) { const item = arr.shift(); copy.push(item * 2); }