Run results for: Functional Vs Imperative

Run details:

User agent: Mozilla/5.0 (X11; CrOS x86_64 14541.0.0) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/126.0.0.0 Safari/537.36

Browser: Chrome 126

Operating system: Chrome OS 14541.0.0

Device Platform: Desktop

Date tested: one year ago

Imperative

231K/s

Functional

33K/s

View exact numbers

Test name	Executions per second
✓ Imperative	231,100 Ops/sec
Functional	33,453 Ops/sec

Script Preparation code:

window.nums = new Array(1000).fill(0).map((x,i) => i)

Tests:

Functional
const y = nums.filter(x => x%2).map(x => x*3).filter(x => x < 100) return y
Imperative
const y = [] for(const x of nums) { if(x%2) { const x3 = x*3; if(x3 < 100) { y.push(x3) } } } return y