Run results for: Javascript: reduce VS for (modified)

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 (iPhone; CPU iPhone OS 13_6_1 like Mac OS X) AppleWebKit/605.1.15 (KHTML, like Gecko) Version/13.1.2 Mobile/15E148 Safari/604.1

Browser: Mobile Safari 13

Operating system: iOS 13.6.1

Device Platform: Mobile

Date tested: 3 years ago

Test name	Executions per second
Number 1: use for iterator	1185905.0 Ops/sec
Number 2: using reduce method	9441099.0 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; const listLength = list.length; for (let i = 0; i < listLength; 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 (modified)

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