How to inspect the default object properties in the Node REPL

Question

I am using Node REPL. When we define a constructor function like one here:

function Rabbit() { }

It's prototype object i.e Rabbit.prototype have the constructor property which can be referenced like this:

>> Rabbit.prototype.constructor
   [Function: Rabbit]

This constructor property does not get listed in the Rabbit.prototype object but doing Rabbit.prototype.constructor and Rabbit.prototype["constructor"] gives this info appropriately.

>> Rabbit.prototype
   {}

a) How can I view these default properties like constructor, hasOwnProperty, toString,valueOf etc. ? In browser while using the console, I get a nice little dropdown for that. I am expecting some kind of dir command for that.

b) And why there inherited properties are not shown, when I fire Rabbit.prototype in the console ? Is it desired because we want to show only user added stuff ?

c) And where are they actually defined Object or Function ?

EDIT :- Seems like these are added up to Object.prototype . Reference :

https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Object/prototype

Also,

>> Object.getOwnPropertyNames(Object.prototype)
[ 'constructor',
  'toString',
  'toLocaleString',
  'valueOf',
  'hasOwnProperty',
  'isPrototypeOf',
  'propertyIsEnumerable',
  '__defineGetter__',
  '__lookupGetter__',
  '__defineSetter__',
  '__lookupSetter__' ]

Do we need to recursively traverse the prototype chain by applying Object.getOwnPropertyNames on each object for listing the owned and inherited ones ?

Regards.

Guess what, there's also a ton more it's not showing you, like `toString`, `hasOwnProperty` and other built in methods. Your question should really be: how to get the Node REPL to show default object properties? — deceze, May 11 '15 at 07:08
@deceze, Yeah I am working on that. Was taking a screenshot for that. Changing the tittle. — darxtrix, May 11 '15 at 07:09
@deceze, `Rabbit.prototype` inherits there from `Object.prototype` or what ? — darxtrix, May 11 '15 at 07:24
have you tried `for (var name in Rabbit.prototype) {console.log(name)}` ? — maioman, May 11 '15 at 07:24
@jcubic, worked actually but what about the other ones `toString` etc. I need to view all of them. — darxtrix, May 11 '15 at 07:35

score 1 · Answer 1 · edited May 23 '17 at 12:30

1

Yes, it is required to move down the prototype chain by applying Object.getOwnPropertyNames() to get list of non-enumerable properties also. Got it from here :

Is it possible to get the non-enumerable inherited property names of an object?

edited May 23 '17 at 12:30

Community

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answered May 11 '15 at 08:37

darxtrix

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How to inspect the default object properties in the Node REPL

1 Answers1

Is it possible to get the non-enumerable inherited property names of an object?