How to ensure javascript addition instead of string concatenation (Not always adding integers)

Question

Through my javascript library, I end up with a string that represents a number. Now I want to preform an addition on that number without it doing a string concatenation inst

Answer 1

For some reason.... who knows???

Using parseFloat works.... when parseInt does not... obviously they are not always the same.

FWIW.... I'm "adding" data elements from "checked" checkboxes here...

    var AddOns = 0;

    $( '.broadcast-channels').each(function(){              
        if ( $(this).prop("checked")) {                             
            var thisAddOn =  parseFloat($(this).data('channel'));      
            AddOns = AddOns + thisAddOn;                                      
        }           
});