Run results for: Local scope vs outer scope variables

Run details:

User agent: Mozilla/5.0 (X11; Linux x86_64; rv:120.0) Gecko/20100101 Firefox/120.0

Browser: Firefox 120

Operating system: Linux

Device Platform: Desktop

Date tested: 2 years ago

Benchmark engine: Benchmark.js

Do not cache at all

18.1M/s

Cache in the inner scope

16.5M/s

View exact numbers

Test name	Executions per second
✓ Do not cache at all	18,144,520 Ops/sec
Cache in the inner scope	16,545,535 Ops/sec

Script Preparation code:

var testVar = 10;

Tests:

Cache in the inner scope
function doTest1(){ var sum = 0; for (var i = 0; i < testVar; i++){ sum = sum + i; } } doTest1();
Do not cache at all
function doTest2(){ var sum = 0; var testVarLocal = testVar; for (var i = 0; i < testVarLocal; i++){ sum = sum + i; } } doTest2();