Display of __proto__ vs [[Prototype]] in Chrome Developer Tools
I am learning Java Script and I see the examples that were published a few years ago show __proto__ in the chrome developer tool - console while explaining the prototypical inheritance concept.
When I execute the same sample code I don't see __proto__ anymore in my current version of Chrome. I only see [[Prototype]].
Questions:
- Hope both are the same? If yes, from which version that this change has taken place.
- Is it possible to revert my chrome developer tool to older version to view it as
__proto__?
Yes, they are the same. It was reported as a bug and then changed somewhen around April 2021 (Chrome 92), to better align with the spec and follow Firefox devtools' lead.
No, you cannot change it back.
The [[prototype]] syntax reflects that it is an internal slot (also here) exposed only by the debugger, not some normal property. Using __proto__ as an alias causes quite some confusion, because object actually can have a normal property of that name, and there's also the old deprecated Object.prototype.__proto__ getter/setter that did access the [[prototype]].
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