Run results for: if-check in loop vs two loops

Run details:

User agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10_15_7) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/109.0.0.0 Safari/537.36

Browser: Chrome 109

Operating system: Mac OS X 10.15.7

Device Platform: Desktop

Date tested: one year ago

Test name	Executions per second
if-check in for-of; true	3636188.0 Ops/sec
if-check outside of for-of; true	3338492.5 Ops/sec
if-check in for-of; false	7263803.0 Ops/sec
if-check outside of for-of; false	7275218.5 Ops/sec
if-check in for-loop: true	4281429.5 Ops/sec
if-check outside of for-loop; true;	4186709.8 Ops/sec
if-check in for-loop; false	7632536.5 Ops/sec
if-check outside of for-loop; false	7271208.5 Ops/sec

Script Preparation code:

function useArray() {

    const array = [];

    for (let i = 0; i < 20; i++) {
        array.push(i);
    }
    return array;
}

Tests:

if-check in for-of; true
const array = useArray(); let count = ""; let active = true; const arrayB = [] for (const item of array) { arrayB.push(item); if (active) { count += item; } }
if-check outside of for-of; true
const array = useArray(); let count = ""; let active = true; const arrayB = [] for (const item of array) { arrayB.push(item); } if (active) { for (const item of array) { count += item; } }
if-check in for-of; false
const array = useArray(); let count = ""; let active = false; const arrayB = [] for (const item of array) { arrayB.push(item); if (active) { count += item; } }
if-check outside of for-of; false
const array = useArray(); let count = ""; let active = false; const arrayB = [] for (const item of array) { arrayB.push(item); } if (active) { for (const item of array) { count += item; } }
if-check in for-loop: true
const array = useArray(); let count = ""; let active = true; const arrayB = [] const limit = array.length; for (let i = 0; i < limit; i++) { const item = array[i]; arrayB.push(item); if (active) { count += item; } }
if-check outside of for-loop; true;
const array = useArray(); let count = ""; let active = true; const arrayB = [] const limit = array.length; for (let i = 0; i < limit; i++) { const item = array[i]; arrayB.push(item); } if (active) { const limit = array.length; for (let i = 0; i < limit; i++) { const item = array[i]; count += item; } }
if-check in for-loop; false
const array = useArray(); let count = ""; let active = false; const arrayB = [] const limit = array.length; for (let i = 0; i < limit; i++) { const item = array[i]; arrayB.push(item); if (active) { count += item; } }
if-check outside of for-loop; false
const array = useArray(); let count = ""; let active = false; const arrayB = [] const limit = array.length; for (let i = 0; i < limit; i++) { const item = array[i]; arrayB.push(item); } if (active) { const limit = array.length; for (let i = 0; i < limit; i++) { const item = array[i]; count += item; } }

Run results for: if-check in loop vs two loops

if-check in for-of; true

if-check outside of for-of; true

if-check in for-of; false

if-check outside of for-of; false

if-check in for-loop: true

if-check outside of for-loop; true;

if-check in for-loop; false

if-check outside of for-loop; false