Run results for: Brackets vs arrow function

Run details:

User agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10_15_7) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/126.0.0.0 Safari/537.36

Browser: Chrome 126

Operating system: Mac OS X 10.15.7

Device Platform: Desktop

Date tested: one year ago

Test name	Executions per second
Brackets	119585.3 Ops/sec
Arrow function	47567.2 Ops/sec

Tests:

Brackets
var acc = 0; for (var i = 0; i < 10000; i++) { let value = 1; { let value = i; acc += value; }; value++; if(value !== 2) throw 'error'; }
Arrow function
var acc = 0; for (var i = 0; i < 10000; i++) { let value = 1; (value => acc += value)(i); value++; if(value !== 2) throw 'error'; }