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

Run details:

User agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/122.0.0.0 Safari/537.36

Browser: Chrome 122

Operating system: Windows

Device Platform: Desktop

Date tested: 2 years ago

Benchmark engine: Benchmark.js

map()

15.8M/s

ForLoop

1.9M/s

JSON.stringify()

621K/s

View exact numbers

Test name	Executions per second
✓ map()	15,755,532 Ops/sec
ForLoop	1,903,369 Ops/sec
JSON.stringify()	620,988 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 }); }