Run results for: Duplicate array for immutability (spread vs array.from vs map vs manually)

Run details:

User agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/83.0.4103.116 Safari/537.36

Browser: Chrome 83

Operating system: Windows

Device Platform: Desktop

Date tested: 3 years ago

Script Preparation code:

var testData = []
for (let i = 0; i <= 100000; i++) {
	testData[i] = i
}

Tests:

Spread
let copy = [...testData]
Array.from
let copy = Array.from(testData)
Map
let copy = testData.map(item => item)
manual loop
let copy = [] for (let i = 0; i < testData.length; i++) { copy.push(testData[i]) }