When using Chrome Version 125.0.6422.76 (Official Build) (64-bit), I have encountered a strange issue with the Array constructor.
https://i.sstatic.net/6HSUS2gB.png
It seems that the length of array 'a' is correctly stored as '3' internally.
I am not overly concerned if Javascript is optimizing by allocating the elements lazily, as long as a length 3 array is returned for the map call in a.map().
However, it appears that this is not the case, as no 'foo' elements are printed as with b.map().
Upon initializing an array using the Array constructor, it results in an empty array. Even though it possesses a length property, JavaScript has simply allocated a block of memory for potential future use without any actual content. This renders the array devoid of any elements to iterate over.
In the second scenario with the b array, it contains elements that are undefined. Hence, it becomes possible to iterate over them.
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