Run results for: Javascript: reduce VS for

Compare the "reduce" method with the "for" iteration method. Use case: There is an array with different numbers, we will compare the performance between the two methods to find the quantity of numbers greater than zero in the array list.

Run details:

User agent: Mozilla/5.0 (Linux; arm_64; Android 11; Redmi Note 9S) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/132.0.6834.2144 YaApp_Android/25.20.1 YaSearchBrowser/25.20.1 BroPP/1.0 SA/3 Mobile Safari/537.36

Browser: Chrome 132

Operating system: Android 25.20.1

Device Platform: Mobile

Date tested: one year ago

Test name	Executions per second
Number 1: use for iterator	10151324.0 Ops/sec
Number 2: using reduce method	22009280.0 Ops/sec

Script Preparation code:

var list = [1, 0, -2, -1, 3, 0, 1, 8, -10, 3, 0, -1, -3];

Tests:

Number 1: use for iterator
let countNumberGreaterThanZero = 0; for (let i = 0; i < list.length; i++) { if (list[i] > 0) { countNumberGreaterThanZero++; } }
Number 2: using reduce method
let countsNumbersGreaterThanZero = (acc, cur) => acc + (cur > 0 ? 1 : 0); list.reduce(countsNumbersGreaterThanZero, 0)

Run results for: Javascript: reduce VS for

Compare the "reduce" method with the "for" iteration method. Use case: There is an array with different numbers, we will compare the performance between the two methods to find the quantity of numbers greater than zero in the array list.

Number 1: use for iterator

Number 2: using reduce method