const vs let vs var (fixed) (version: 0)

Comparing performance of: var vs let vs const

Created: 4 years ago by: Guest
Go to the latest result
Tests:

Historical Performance Data aggregated from 82 community runs

Desktop Results:
Chrome 48 runs
var
15.1M/s
let
10.1M/s
const
9.3M/s

Fastest: var (1.6x faster)

View exact numbers
  • ✓ var: 15,116,748 ops/sec
  • • let: 10,148,376 ops/sec
  • • const: 9,329,836 ops/sec
Firefox 19 runs
let
19.1M/s
const
18.6M/s
var
18.6M/s
View exact numbers
  • ✓ let: 19,098,672 ops/sec
  • • const: 18,625,378 ops/sec
  • • var: 18,607,740 ops/sec
Safari 5 runs
var
44.3M/s
let
44.0M/s
const
43.4M/s
View exact numbers
  • ✓ var: 44,251,172 ops/sec
  • • let: 43,966,432 ops/sec
  • • const: 43,390,300 ops/sec
Mobile Results:
Chrome 10 runs
var
9.6M/s
let
4.1M/s
const
3.8M/s

Fastest: var (2.5x faster)

View exact numbers
  • ✓ var: 9,590,486 ops/sec
  • • let: 4,055,450 ops/sec
  • • const: 3,842,016 ops/sec

Results show median performance across all community submissions. Run this benchmark yourself to verify on your device.

Rendered benchmark preparation results:

Suite status: <idle, ready to run>

Previous results
  • Test case name Result
    var
    let
    const

    Fastest: N/A

    Slowest: N/A

Latest run results:
Run details: (Test run date: 9 months ago)
Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/141.0.0.0 Safari/537.36
Chrome 141 on Windows
View result in a separate tab
let
4.8M/s
var
4.6M/s
const
1.1M/s
View exact numbers
Test name Executions per second
✓ let 4,762,396 Ops/sec
var 4,567,386 Ops/sec
const 1,064,042 Ops/sec

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