When using .map() method on selected elements set I want to return array as mapped value but for some reasons jQuery concatenates arrays instead of putting array into array.

Expected:

[[0,1], [2,3]]

Actual:

[0, 1, 2, 3]

I found out that you can double wrap return values to array like:

return [[0, 1]];

and then I get the desired effect but it is ugly.

If this is default behavior maybe you could implement concatenation flag on method itself like so:

.map(callback, concat = true/false)

and when concat === false you simple return the array instead of concatenating.