Run results for: var only vs let + const

Run details:

User agent: Mozilla/5.0 (X11; Linux x86_64; rv:94.0) Gecko/20100101 Firefox/94.0

Browser: Firefox 94

Operating system: Linux

Device Platform: Desktop

Date tested: 2 years ago

Test name	Executions per second
var only	10055.5 Ops/sec
let + const	10218.8 Ops/sec

Script Preparation code:

var array = Array.from(Array(10000).keys());

Tests:

var only
for(var i = 1; i < array.length; i++) { var prev = array[i-1]; var curr = array[i]; array[i-1] = prev + curr; }
let + const
for(let i = 1; i < array.length; i++) { const prev = array[i-1]; const curr = array[i]; array[i-1] = prev + curr; }