Run results for: Measure iterations3

Run details:

User agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10_15_7) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/122.0.0.0 YaBrowser/24.4.0.0 Safari/537.36

Browser: Yandex Browser 24

Operating system: Mac OS X 10.15.7

Device Platform: Desktop

Date tested: 2 months ago

Test name	Executions per second
Loop with conditions	113288.4 Ops/sec
Iterator	171068.2 Ops/sec
Generator	175948.3 Ops/sec
.forEach	113089.9 Ops/sec
fori	57088.4 Ops/sec

Script Preparation code:

function filter(iterable, predicate) {
    const iter = iterable[Symbol.iterator]();
    
    return {
        [Symbol.iterator]() {
            return this;
        },
        next() {
            let result;
          
          	while (
              !(result = iter.next()).done &&
              !predicate(result.value)
            );
          
          	return result;
        }
    };
}

function* filterGenerator(iterable, predicate){
    for (const value of iterable) {
        if (predicate(value)) {
            yield value;
        }
    }
}

var arr = Array(100).fill(0).map((_, i) => i + 1);
var predicate = (x) => x % 3 === 0 && x % 5 === 0;

var test1 = 0, test2 = 0, test3 = 0, test4 = 0, test5 = 0;

Tests:

Loop with conditions
for (const value of arr) { if (predicate(value)) { test1 += value; } } console.log(test1, 'test1');
Iterator
for (const value of filter(arr, predicate)) { test2 += value; } console.log(test2, 'test2');
Generator
for (const value of filterGenerator(arr, predicate)) { test3 += value; } console.log(test3, 'test3');
.forEach
arr.forEach((x) => { if (predicate(x)) test4 += x; }); console.log(test4, 'test4');
fori
for (let i = 0; i < arr.length; i++) { if (predicate(arr[i])) { test5 += arr[i]; } } console.log(test5, 'test5');

Run results for: Measure iterations3

Loop with conditions

Iterator

Generator

.forEach

fori