Run results for: Test shitty shit

Run details:

User agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/96.0.4664.45 Safari/537.36

Browser: Chrome 96

Operating system: Windows

Device Platform: Desktop

Date tested: 3 years ago

Test name	Executions per second
A sum	19.1 Ops/sec
b sum	18.4 Ops/sec
a each	121.5 Ops/sec
b each	119.8 Ops/sec

Script Preparation code:

var a = [0],
    b = [{
        valueOf: function() {
            return 0;
        }
    }];
for (let i = 1; i < 1000000; ++i) {
    a[i] = b[i] = i;
}

Tests:

A sum
let x = 0; for( let i = 0; i < 1000000; ++i ) { x += a[i]; }
b sum
let x = 0; for( let i = 0; i < 1000000; ++i ) { x += b[i]; }
a each
let x = 0; a.forEach(val => x+= val);
b each
let x = 0; b.forEach(val => x+= val);

Run results for: Test shitty shit

A sum

b sum

a each

b each