Run results for: Extract data from array - map() vs JSON.stringify() vs for loop

Run details:

User agent: Mozilla/5.0 (X11; Fedora; Linux x86_64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/138.0.0.0 Safari/537.36 Edg/138.0.0.0

Browser: Chrome 138

Operating system: Fedora

Device Platform: Desktop

Date tested: one year ago

Benchmark engine: Benchmark.js

ForLoop

51.5M/s

map()

35.3M/s

JSON.stringify()

901K/s

View exact numbers

Test name	Executions per second
✓ ForLoop	51,530,196 Ops/sec
map()	35,311,212 Ops/sec
JSON.stringify()	900,525 Ops/sec

Script Preparation code:

var data = [
    {name: "anonystick", sex:1, age: 42, phone: 03543214564},
    {name: "medium", sex:0, age: 45, phone: 0321452145},
    {name: "subrss", sex:1, age: 41, phone: 03789456785}
]

Tests:

map()
data.map(el => { return {name: el.name, sex: el.sex} })
JSON.stringify()
JSON.parse(JSON.stringify(data, ["name","sex"]))
ForLoop
var new_data = []; for (var i=0, new_data=[]; i<data.length; i++) { new_data.push({ name: data[i].name, sex: data[i].age }); }