Run results for: JSON.stringify vs Deep Clone

Run details:

User agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64; rv:133.0) Gecko/20100101 Firefox/133.0

Browser: Firefox 133

Operating system: Windows

Device Platform: Desktop

Date tested: one year ago

Benchmark engine: Benchmark.js

DeepClone

109K/s

JSON.stringify

103K/s

View exact numbers

Test name	Executions per second
✓ DeepClone	109,355 Ops/sec
JSON.stringify	103,246 Ops/sec

Script Preparation code:

var obj = {};
var objCount = 100;

for (let i = 0; i < objCount; i++) {
    obj[i] = [1, 2, 3];
}

function deepClone(source) {
   return Array.isArray(source)
    ? source.map((item) => deepClone(item))
    : source && typeof source === "object"
    ? Object.getOwnPropertyNames(source).reduce((o, prop) => {
        o[prop] = deepClone(source[prop]);
        return o;
      }, Object.create(Object.getPrototypeOf(source)))
    : source;
}

Tests:

DeepClone
var clone = deepClone(obj);
JSON.stringify
var clone = JSON.parse(JSON.stringify(obj));