Run results for: Variable vs array with one item

Run details:

User agent: Mozilla/5.0 (X11; Linux x86_64; rv:135.0) Gecko/20100101 Firefox/135.0

Browser: Firefox 135

Operating system: Linux

Device Platform: Desktop

Date tested: one year ago

Single element in variable

582K/s

Single element in array

578K/s

View exact numbers

Test name	Executions per second
✓ Single element in variable	581,840 Ops/sec
Single element in array	577,647 Ops/sec

Script Preparation code:

const variable = document.createElement("div")
const array = [document.createElement("div")]

function setVariable() {
	variable.setAttribute("style", `transform: translate3d(${Math.random()}px, ${Math.random()}px, ${Math.random()}px)`)
}

function setArray() {
	array.forEach((elem)=>{ elem.setAttribute("style", `transform: translate3d(${Math.random()}px, ${Math.random()}px, ${Math.random()}px)`) })
}

Tests:

Single element in variable
setVariable()
Single element in array
setArray()

Run results for: Variable vs array with one item

Testing the performance impact of an array when it only contains one item

Single element in variable

Single element in array