Run results for: Deep copy : JSON vs Specified-Method

Run details:

User agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10_15_7) AppleWebKit/605.1.15 (KHTML, like Gecko) Version/17.2.1 Safari/605.1.15

Browser: Safari 17

Operating system: Mac OS X 10.15.7

Device Platform: Desktop

Date tested: 2 years ago

Copy (no generic)

6.2M/s

Copy (generic)

2.8M/s

JSON

1.5M/s

View exact numbers

Test name	Executions per second
✓ Copy (no generic)	6,160,774 Ops/sec
Copy (generic)	2,802,696 Ops/sec
JSON	1,529,252 Ops/sec

Script Preparation code:

function copyX(x) {
  return {
    a: x.a,
    b: x.b,
    c: {
      a: x.c.a
    }
  }
}

function cloneObject(obj) {
    var clone = {};
    for(var i in obj) {
        if(obj[i] != null &&  typeof(obj[i])=="object")
            clone[i] = cloneObject(obj[i]);
        else
            clone[i] = obj[i];
    }
    return clone;
}

var x = {
  a: 444,
  b: 666,
  c: {
    a: "dddd"
  }
}

Tests:

JSON
JSON.parse(JSON.stringify(x))
Copy (no generic)
copyX(x)
Copy (generic)
cloneObject(x)