Run results for: JS Variable Performance (const vs let vs var)

Run details:

User agent: Mozilla/5.0 (Android 15; Mobile; rv:148.0) Gecko/148.0 Firefox/148.0

Browser: Firefox Mobile 148

Operating system: Android

Device Platform: Mobile

Date tested: 6 months ago

Benchmark engine: Benchmark.js

TEST_3: CONST

13.0M/s

TEST_2: LET

10.5M/s

TEST_1: VAR

9.9M/s

View exact numbers

Test name	Executions per second
✓ TEST_3: CONST	13,008,980 Ops/sec
TEST_2: LET	10,520,385 Ops/sec
TEST_1: VAR	9,891,314 Ops/sec

HTML Preparation code:

<!--your preparation HTML code goes here-->

Script Preparation code:

/*your preparation JavaScript code goes here
To execute async code during the script preparation, wrap it as function globalMeasureThatScriptPrepareFunction, example:*/
async function globalMeasureThatScriptPrepareFunction() {
    // This function is optional, feel free to remove it.
    // await someThing();
}

Tests:

TEST_1: VAR
var g = { e: [] } g.o = function(x) { g.e.push(...[1,2,3]) } g.o()
TEST_2: LET
let g = { e: [] } g.o = function(x) { g.e.push(...[1,2,3]) } g.o()
TEST_3: CONST
const g = { e: [] } g.o = function(x) { g.e.push(...[1,2,3]) } g.o()