688401 - Web Console displays "[null]" for [Object.create(null)]

Status: RESOLVED FIXED

(DevTools :: Console, defect)

Description

[David Bruant]

< console.log( [Object.create(null)] )
> [null]

What is logged is not an array with one null element. It's an array with one object

Comment 1

[Rob Campbell [:rc] (:robcee)]

this is pretty fringe. For whatever reason, Object.create(null) in the console is return null. |null| isn't extensible?

Comment 2

[David Bruant]

(In reply to Rob Campbell [:rc] (:robcee) from comment #1)
> this is pretty fringe. For whatever reason, Object.create(null) in the
> console is return null. |null| isn't extensible?
I don't understand what you mean here. In JavaScript, null is a value, very much like undefined.
Object.create(null) creates an object (with properties, etc.) which [[Prototype]] is null, so it's an object, so I think it should be logged differently than the null value to avoid the confusion.

When the console displays "[null]" for [Object.create(null)], it makes it undistinguishable from [null] (an array with one element which value is null). It may be fringe, but it's wrong and misleading when you actually use it.

I'm taking the freedom to reopen as I think the ambiguity the console creates is worth fixing.

Comment 3

[Panos Astithas (he/him) [:past] (please ni?)]

Bug 783499 will fix this.

Comment 5

[David Bruant]

Fixed indeed after Bug 783499.

Thanks :-)