What does $($(this)) mean?

Question

I saw some code around the web that uses the following statement

if ($($(this)).hasClass(\"footer_default\")) {
      $(\'#abc\')
        .appendTo($(this))
             


        

Answer 1

You can wrap $ as many times as you want, it won't change anything.

If foo is a DOM element, $(foo) will return the corresponding jQuery object.

If foo is a jQuery object, $(foo) will return the same object.

That's why $($(this)) will return exactly the same as $(this).