Run results for: Reference vs New Variable

Run details:

User agent: Mozilla/5.0 (Windows NT 6.1; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/69.0.3497.100 Safari/537.36

Browser: Chrome 69

Operating system: Windows 7

Device Platform: Desktop

Date tested: 5 years ago

Test name	Executions per second
Reference	2073191.0 Ops/sec
New Variable	2272026.0 Ops/sec

Tests:

Reference
const myArray = [{id: 1}, {id: 1}, {id: 1}, {id: 1}, {id: 1}, {id: 1}, {id: 1}, {id: 1}, {id: 1}]; function addingFunction(number) { return number + 1; } function myFunction(arr) { let myValue; myArray.forEach((a) => { myValue = () => addingFunction(a.id); }); } myFunction(myArray);
New Variable
const myArray = [{id: 1}, {id: 1}, {id: 1}, {id: 1}, {id: 1}, {id: 1}, {id: 1}, {id: 1}, {id: 1}]; function addingFunction(number) { return number + 1; } function myFunction(arr) { let myValue; myArray.forEach((a) => { const b = () => addingFunction(a.id); myValue = b; }); } myFunction(myArray);