javascript - What is this array called... and how to remove items from it

I have an array that I am using, I am having difficulties describing what kind of an array it is, which is making it hard for me to work with it. So far it works for me. I am just curious.

I eventually want to remove the end of this array.

I tried .pop() and .grep(). Its not working.

Here is an example of my code.

var options = {};
$('.option:visible').each(function(){
     var option_label = "";
     var option_selected = [];
     var option_img = "";


     ...


     options[option_label] = {
         option_selected: option_selected,
         option_image : option_img
     };
});

What I am trying to do is:

if(option_label.indexOf("something") != -1) {
   //then pop off options
} 
//continue about your business

For clarification I wont know the exact title of the option_label.

Answer

It is a Javascript Object. You might want ot have a look at this question to remove properties, it gives different ways to to that. One of them is :

delete options.something;