Run results for: Test map reduce vs for...loop

Run details:

User agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10_15_7) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/128.0.0.0 Safari/537.36

Browser: Chrome 128

Operating system: Mac OS X 10.15.7

Device Platform: Desktop

Date tested: one year ago

Test name	Executions per second
Slice and reduce	1771042.2 Ops/sec
For loop	1582999.5 Ops/sec

Script Preparation code:

var data = [1, 2, 3, 4, 5, 6, 7, 8, 9, 0];
var ndata = data.reduce((acc, value, index) => {
        acc[index] = (acc[index - 1] || 0) + value;
        return acc;
    }, []);

Tests:

Slice and reduce
var copy = [...ndata.slice(0, 2), ...data.slice(3,9).reduce((acc, value, index) => { acc[index] = (acc[index - 1] || 0) + value; return acc; }, []) ];
For loop
var copy = [...ndata.slice(0, 2)]; for (var i = 3; i < 8; i++) { copy[i] = (ndata[i] || 0) + 34; }

Run results for: Test map reduce vs for...loop

Slice and reduce

For loop