propiedades profundas seguras

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/* Acceder a propiedades de forma segura. Leído en El abismo de null
https://elabismodenull.wordpress.com/2017/03/16/pequenos-trucos-para-mejorar-tu-javascript/
*/


const isObject = obj => obj && typeof obj === 'object';
const hasKey = (obj, key) => key in obj;
const Undefined = new Proxy({}, {
    get: function(target, name){
        return Undefined;
    }
 });

function safe(obj) {
    return new Proxy(obj, {
        get: function(target, name) {
            return hasKey(target, name) ? 
                (isObject(target[name]) ? 
                   safe(target[name]) : target[name]) : Undefined;
       }
    });
}

const userSafe = safe(user);