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

Run details:

User agent: Mozilla/5.0 (X11; Linux x86_64; rv:147.0) Gecko/20100101 Firefox/147.0

Browser: Firefox 147

Operating system: Linux

Device Platform: Desktop

Date tested: 7 months ago

Benchmark engine: Benchmark.js

map()

45.4M/s

ForLoop

37.5M/s

JSON.stringify()

1.2M/s

View exact numbers

Test name	Executions per second
✓ map()	45,373,688 Ops/sec
ForLoop	37,529,304 Ops/sec
JSON.stringify()	1,184,111 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 }); }