Object deep clone in Javascript

deepClone.js

// Object deep clone
var deepClone = (src) => {
    let objToReturn = {};
    Object.keys(src).forEach(item => {
        if (typeof src[item] === 'object' && !(src[item] instanceof Array)) {
            objToReturn[item] = deepClone(src[item]);
        } else {
            if (typeof src[item] === 'object' && src[item] instanceof Array) {
                objToReturn[item] = [...src[item]];
            } else {
                objToReturn[item] = src[item];
            }
        }
    });
    return objToReturn;
};


// Example
var obj = { 
    x: {
        h: {
            j: {
                u: {
                    e: {
                        r: 10
                    }
                }
            },
            k: {
                t: {
                    w: [1, 2, 3, 4]
                }
            }
        }
    }
}; 

var obj2 = deepClone(obj);

obj2.x.h.k.t.w.push(5);

console.log("obj2", obj2.x.h.k.t.w, obj2.x.h.j.u.e.r);
// (5) [1, 2, 3, 4, 5] 10
console.log("obj", obj.x.h.k.t.w, obj.x.h.j.u.e.r);
// [1, 2, 3, 4] 10