JS key rename with defineProperty won't work in Node.js

Question

Object.prototype.prefixKeys = function (prefix) {
 for (var key in this) 
   this.hasOwnProperty(key) 
   && Object.defineProperty(this, prefix + key, {value: this[key]})
   && delete this[key]
}

Code above works as expected in chrome console. But just removes keys in Node v6.10.2. What am I doing wrong?

Answer 1

The prefixed keys still exist on the object, but if you want them to show up when you, say console.log(obj) , then you need to make the properties enumerable :

Object.prototype.prefixKeys = function (prefix) {
 for (var key in this) 
   this.hasOwnProperty(key) 
   && Object.defineProperty(this, prefix + key, {
     value: this[key],
     enumerable: true
   })
   && delete this[key]
}