A function called deepClone which takes an object and creates a copy of it.

deepClone.js

var personalInfo = {
    name: 'paddy',
    address: {
        town: 'Lerum',
        country: 'Sweden',
    }
}

//function to deep[nested] clone a object 
function deepClone(object) {
    var tempObject = {};
    for (var key in object) {
        if (typeof object[key] === 'object') {
            tempObject[key] = deepClone(object[key]);
        } else {
            tempObject[key] = object[key];
        }
    }
    return tempObject;
}

var clonedObject = deepClone(obj);