String.prototype
String {}
Object.prototype
Object {}
Boolean.prototype
Boolean {}
but Array.prototype outputs [], why not Array [] or something else? What happened?
-
3I think this is due to the Inspector internal formatter.Florent– Florent2013-11-27 11:06:58 +00:00Commented Nov 27, 2013 at 11:06
-
Because that's just how the console represents arrays. It's probably different in some other browser's console.JJJ– JJJ2013-11-27 11:07:46 +00:00Commented Nov 27, 2013 at 11:07
-
@Florent do you have any article about it ? thankslooping– looping2013-11-27 11:17:02 +00:00Commented Nov 27, 2013 at 11:17
-
Which console are you using? Please add the respective browser-specific tagBergi– Bergi2013-12-01 22:00:04 +00:00Commented Dec 1, 2013 at 22:00
Add a comment
|
1 Answer
I looked into the ECMA specs and V8 source code, but I couldn't get a concrete answer.
According to the ECMA-262 spec, every object must have algorithms for all of the essential internal methods, however, all objects do not necessarily use the same algorithms for those methods which means the output will be implementation specific at least in the case of [[GetPrototypeOf]].
Hence, if you try the same in different browsers, you'll notice that the output is slightly different in each.
Internet Explorer 11:
Array.prototype
[object Array] []
String.prototype
[object String] {length:0}
Object.prototype
[object Object] {}
Boolean.prototype
[object Boolean] {}
Firefox:
Array.prototype
[object Array]
String.prototype
[object String]
Object.prototype
[object Object]
Boolean.prototype
[object Boolean]
Chrome and Opera:
Array.prototype
[]
String.prototype
String {}
Object.prototype
Object {}
Boolean.prototype
Boolean {}
