efficiently creating a variable when a checkbox is checked and using these variables later in the code

below is the information I need help with.

$(document).ready(function(){
        $('.checkboxes :checkbox').click(function(){
            if($(this).is(':checked')){
                console.log(this.id + this.checked)

i want to set a variable with the samename of the id of the checked box so if showItems was checked i would have a variable var showItems = true; I want this so I could see if showItems is checked which would alow me to perform the proper functions i think i could do something like this

                if($this.id = "withones"){
                    var withones = true;//on
                }
                if($this.id = "withoutOnes"){
                    var withoutOnes = true;//on
                }
                etc.

i feel like the above is a rookie way to code. lets say i have alot of checkboxes. and it look like im repeating myself. I tried putting the ids in an array and loop through them but I got the html element in the console when i clicked on the box. I would like for someone to tell me if there is a more efficient way to set up these variables. and if so show me please.

Also I'm new to programming so thanks for your help so far. but I was also thinking about another problem. if I set up these variables here and I want to set up another function somewhere else to perform mathematical operations perse. i want that function to be able to evaluate the value of the withones and withoutOnes variables so I would like to do something like this in the function

function add(){
                    if(withones){ //true|| false
                        return 2 + 2;
                    }
                    if (withoutOnes) {
                        return 'blah'
                    };
                }

I have had problems in the past trying to test the values that are set outside the function. I think i tried setting it in the arguments. but it just didn't read. If you could also show me an example of using the variables some where else in the code like discussed above that will be helpful . I forgot to mention that the value of the variable will change when the user clicks on the box. either to true or false. I think my problem in the past is that when the box is checked and then uncheck I had a problem changing the variable especially when it is being used in a separate function

            }
        });
    });