Javascript: array has wrong number of empty slots, am I going bonkers?

[tomysshadow]

I apologize if this is the wrong spot for this, but I didn't know where else to report it.

Open a new tab.
Type this into the console:

Code: Select all

var myArray = new Array();
myArray[15] = "test";

Then, type this into the console:

Code: Select all

myArray

The result of doing this in Vivaldi is:

Code: Select all

[undefined × 15, "test"]

The result of doing this in Pale Moon is:

Code: Select all

Array [ <10 empty slots>, 6 more… ]

It says there are 6 more elements, despite there only being one - and clicking on "6 more..." shows there is only one array element. This is dead simple, and other browsers handle this correctly, so is it safe to say this is a Pale Moon specific issue?

[Moonchild]

The total number of elements is correct. Keep in mind that undefined array elements in a sparse array are still elements.
Array, 0-based, 16 elements (0-14 undefined + 15 defined).
Pale Moon only shows the first 10 elements in the console (to prevent huge arrays from flooding the output), and lets you know how many more there are in the array (including empty array elements), being 6. (showing 0-9, leaving [10-14](5)+15(1) = 6 elements)
Clicking more... will open up the object inspector which will only show you the actually defined elements. It still gives you the total array length of 16 there as well.

Everything is perfectly in order, and you're just looking at a different presentation of the same data.
(in other words: 15+1 = 10+6)