Run results for: for vs. map

Run details:

User agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/86.0.4240.75 Safari/537.36

Browser: Chrome 86

Operating system: Windows

Device Platform: Desktop

Date tested: 3 years ago

Test name	Executions per second
map10	5612797.0 Ops/sec
for10	5393591.0 Ops/sec
map1k	180510.8 Ops/sec
for1k	148983.8 Ops/sec
map100k	407.4 Ops/sec
for100k	723.9 Ops/sec
map1M	38.3 Ops/sec
for1M	44.2 Ops/sec

Script Preparation code:

var arr10 = new Array(10).fill();
var arr1k = new Array(1000).fill();
var arr100k = new Array(100000).fill();
var arr1M = new Array(1000000).fill();

Tests:

map10
const map10 = arr10.map((item) => item);
for10
const for10 = []; for (const item of arr10) { for10.push(item); }
map1k
const map1k = arr1k.map((item) => item);
for1k
const for1k = []; for (const item of arr1k) { for1k.push(item); }
map100k
const map100k = arr100k.map((item) => item);
for100k
const for100k = []; for (const item of arr100k) { for100k.push(item); }
map1M
const map1M = arr1M.map((item) => item);
for1M
const for1M = []; for (const item of arr1M) { for1M.push(item); }

Run results for: for vs. map

map10

for10

map1k

for1k

map100k

for100k

map1M

for1M