javascript - Primitive value returned from constructor will be lost

Question

I created a function:

function CheckHidden(el){ return $(el).css('display')!='none' }

My IDE warns me that:

Primitive value returned from constructor will be lost when called with 'new'

Actually when I call it like this:

var all = $("#catalog-body > div").filter(function(){return  CheckHidden(this)})

it doesn't work and doesn't reduce set of elements to unhidden ones. Please explain to me the issue. I have a giant lack of knowledge.

Answer 1

I ran into this warning myself and if you want to know the cause, it is because your IDE expect function names to start with a lowercase letter. Since your function is called CheckHidden with a capital C, it thinks it's a class declaration.

However, you should still use jQuery's :visible selector to fix your specific issue.