var obj = {};

var objCount = 100;

​

for (let i = 0; i < objCount; i++) {

    obj[i] = [1, 2, 3];

}

​

function deepClone(objIn) {

    let copy;

​

    if (objIn === null || typeof objIn !== 'object') {

        return obj;

    }

​

    if (objIn instanceof Array) {

        copy = [];

        for (let i = 0, len = objIn.length; i < len; i++) {

            copy[i] = deepClone(objIn[i]);

        }

        return copy;

    }

​

    if (objIn instanceof Object) {

        copy = {};

        for (const attr in objIn) {

            if (objIn.hasOwnProperty(attr)) {

                copy[attr] = deepClone(objIn[attr]);

            }

        }

        return copy;

    }

​

}

​

function deepMerge(target, ...sources) {

 if (!sources.length) return target

 const source = sources.shift()

​

 if (isObject(target) && isObject(source)) {

  for (const key in source) {

   if (isObject(source[key])) {

    if (!target[key]) Object.assign(target, {[key]: {}})

    deepMerge(target[key], source[key])

   } else {

    Object.assign(target, {[key]: source[key]})

   }

  }

 }

​

 return deepMerge(target, ...sources)

}

​

function isObject(obj) {

 return obj && typeof obj === "object" && !Array.isArray(obj) 

}