Run results for: Custom splice based array filter

Run details:

User agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10_15_7) AppleWebKit/605.1.15 (KHTML, like Gecko) Version/16.1 Safari/605.1.15

Browser: Safari 16

Operating system: Mac OS X 10.15.7

Device Platform: Desktop

Date tested: 11 months ago

Test name	Executions per second
custom array filter	347285.5 Ops/sec
custom array filter with bigger array	186863.3 Ops/sec
Array.filter	1152644.0 Ops/sec

Script Preparation code:

function arrayFilter(data, filterFn) {
    const length = data.length;
    // we go from back to front to avoid index problems (elements change on the same index) and length changes
    for (let i = length - 1; i >= 0; i--) {
        if (filterFn(data[i]) === false) {
            data.splice(i, 1);
        }
    }
    return data;
}

Tests:

custom array filter
const testData = []; for(let i=0; i<100; i++) { testData.push(i % 2); } arrayFilter(testData, i=>!i);
custom array filter with bigger array
const testData = []; for(let i=0; i<100; i++) { testData.push(i % 2); } for(let i=0; i<100; i++) { testData.push(0); } arrayFilter(testData, i=>!i);
Array.filter
const testData = []; for(let i=0; i<100; i++) { testData.push(i % 2); } testData.filter(i => !i);

Run results for: Custom splice based array filter

custom array filter

custom array filter with bigger array

Array.filter