the type of argument can be an ArrayLikeObject

[yadimon]

grep:
not only array can be accepted, but ArrayLikeObject too:

var $selected = $('.selected');
$.grep($selected, function(e, i){return true;})

if you look at the implementation
https://github.com/jquery/jquery/blob/2.1-stable/src/core.js#L384
it should be fully supported.
like by merge:
https://github.com/jquery/jquery/blob/2.1-stable/src/core.js#L370

[arthurvr]

@timmywil Is this officially supported or simply a handy side effect?

[gnarf]

jQuery.grep is only tested against real arrays

However it is passed a jQuery object (ArrayLikeObject) inside the code for jQuery.fn.filter

I'd say this is expected and 👍 on landing this update. Though we should also add a test case for filtering some array like? cc @timmywil

[AurelioDeRosa]

Once jquery/jquery#2605 is merged, I'll merge this PR.

[AurelioDeRosa]

@yadimon Can you improve this sentence by specifying that it can be also an Array-like object?