When looking at String.prototype, Object.prototype, and Boolean.prototype, we see that they all have a similar structure where the object {} is displayed. However, when it comes to Array.prototype, instead of displaying Array [], it outputs []. Why does Array.prototype behave differently? What caused this change in formatting?
After delving into the depths of the ECMA specifications and analyzing the V8 source code, I found myself unable to uncover a definitive answer.
As per the guidance laid out in the ECMA-262 spec, it is prescribed that every object must possess algorithms for all essential internal methods. However, not all objects necessarily employ the same algorithms for these methods, resulting in implementation-specific outcomes, particularly evident in the case of [[GetPrototypeOf]].
Hence, upon experimentation across various browsers, one will observe slight variations in the output produced.
The results from Internet Explorer 11 are as follows:
Array.prototype
[object Array] []
String.prototype
[object String] {length: 0}
Object.prototype
[object Object] {}
Boolean.prototype
[object Boolean] {}
In Firefox:
Array.prototype
[object Array]
String.prototype
[object String]
Object.prototype
[object Object]
Boolean.prototype
[object Boolean]
On Chrome and Opera:
Array.prototype
[]
String.prototype
String {}
Object.prototype
Object {}
Boolean.prototype
Boolean {}
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