Run results for: bunch of array copy v2

Run details:

User agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/104.0.0.0 Safari/537.36

Browser: Chrome 104

Operating system: Windows

Device Platform: Desktop

Date tested: 2 years ago

Test name	Executions per second
for i of	38362428.0 Ops/sec
for i in	2054274.6 Ops/sec
for i length first	46811652.0 Ops/sec
for i length every	47680224.0 Ops/sec
while crazy	40141140.0 Ops/sec
while boring	39310488.0 Ops/sec
slice	200015872.0 Ops/sec

Tests:

for i of

let c = 0
const testArray = [ 1, 2, 3, 4, 5, 6, 7, 8, 9, 0 ]
const newArray = []
for (const i of testArray) {
  newArray[c++] = i
}

AخA
 
let c = 0const testArray = [ 1, 2, 3, 4, 5, 6, 7, 8, 9, 0 ]const newArray = []for (const i of testArray) {  newArray[c++] = i}

for i in

const testArray = [ 1, 2, 3, 4, 5, 6, 7, 8, 9, 0 ]
const newArray = []
for (const i in testArray) {
  newArray[i] = testArray[i]
}

 
const testArray = [ 1, 2, 3, 4, 5, 6, 7, 8, 9, 0 ]const newArray = []for (const i in testArray) {  newArray[i] = testArray[i]}

for i length first

const testArray = [ 1, 2, 3, 4, 5, 6, 7, 8, 9, 0 ]
const length = testArray.length
const newArray = []
for (let i = 0; i < length; i++) {
  newArray[i] = testArray[i]
}

 
const testArray = [ 1, 2, 3, 4, 5, 6, 7, 8, 9, 0 ]const length = testArray.lengthconst newArray = []for (let i = 0; i < length; i++) {  newArray[i] = testArray[i]}

for i length every

const testArray = [ 1, 2, 3, 4, 5, 6, 7, 8, 9, 0 ]
const newArray = []
for (let i = 0; i < testArray.length; i++) {
  newArray[i] = testArray[i]
}

​x
 
const testArray = [ 1, 2, 3, 4, 5, 6, 7, 8, 9, 0 ]const newArray = []for (let i = 0; i < testArray.length; i++) {  newArray[i] = testArray[i]}​

while crazy

const testArray = [ 1, 2, 3, 4, 5, 6, 7, 8, 9, 0 ]
let i = testArray.length
const newArray = []
while (~--i) {
  newArray[i] = testArray[i]
}

 
const testArray = [ 1, 2, 3, 4, 5, 6, 7, 8, 9, 0 ]let i = testArray.lengthconst newArray = []while (~--i) {  newArray[i] = testArray[i]}

while boring

const testArray = [ 1, 2, 3, 4, 5, 6, 7, 8, 9, 0 ]
let i = -1
const newArray = []
while (i++ < testArray.length) {
  newArray[i] = testArray[i]
}

 
const testArray = [ 1, 2, 3, 4, 5, 6, 7, 8, 9, 0 ]let i = -1const newArray = []while (i++ < testArray.length) {  newArray[i] = testArray[i]}

slice

const testArray = [ 1, 2, 3, 4, 5, 6, 7, 8, 9, 0 ]
const newArray = testArray.slice()

 
const testArray = [ 1, 2, 3, 4, 5, 6, 7, 8, 9, 0 ]const newArray = testArray.slice()