The Google Javascript engine v8 has the InternalArray and Array components. While Array is accessible to users, InternalArray is designated for internal use only. What sets these two apart? Are InternalArray and Array essentially the same thing?
The Google Javascript engine v8 has the InternalArray and Array components. While Array is accessible to users, InternalArray is designated for internal use only. What sets these two apart? Are InternalArray and Array essentially the same thing?
Just like you mentioned, the InternalArray is strictly for internal use and cannot be accessed directly through JavaScript.
By modifying properties on Array.prototype, you can alter the behavior of all Arrays. This means that there are no fixed rules about how an Array function should behave. V8 actually implements a portion of the JavaScript Specification using JavaScript code in the src/js directory.
Array.prototype[0] = 'property';
Array.prototype.length = 20;
// Now every Array will have a value at index 0 and a length of 20:
console.log([][0]);
console.log([].length);
It's crucial to ensure that the functionality consistently aligns with the specification and isn't accidentally altered by users. This risk exists with standard Array usage. Therefore, when V8 needs specific array-like behavior, it relies on the isolated InternalArray with its own prototype that remains hidden from users.
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