deepCopyTest.js

deepCopyTest.js

const {cloneDeep} = require('lodash');
const sizeof = require('object-sizeof');

function cloneWeird(obj) {
    return JSON.parse(JSON.stringify(obj));
}

function generateString() {
    return Math.random().toString(36).slice(2);
}

function createObject(depth=0, wide=5) {
    const obj = Object.create(null);

    for (let i = 0; i < wide; ++i) {
        obj[generateString()] = depth ? createObject(depth - 1, wide) : Math.random()
    }

    return obj;
}

const REPEATS = 1e2

function test(cb, depth, wide) {
    let obj = createObject(depth, wide);
    let time = 0;
    
    for (let i = 0; i < REPEATS; ++i) {
        let start = new Date();
        obj = cb(obj);
        let end = new Date();

        time += end - start
    }

    return [time / REPEATS, time];
}

for (let depth = 1, i = 1; depth < 6; depth += 1, ++i) {
    const _depth = depth - 1;
    const obj = createObject(_depth, wide=20);

    console.group(`Round ${i}: size: ${sizeof(obj)} B`)
    console.log(`Method \tspeed (ms/iter)\t time (s)`)

    let [speed, all] = test(cloneDeep, _depth);
    console.log(`Lodash:\t${speed} ms/iter\t ${all / 1000} s`)

    let [speed2, all2] = test(cloneWeird, _depth);
    console.log(`  JSON:\t${speed2} ms/iter\t ${all2 / 1000} s`)

    console.groupEnd();
}