How to concatenate variable in string in javascript

Question

I am using this

var abc = jQuery('#pl_hid_addon_name').val(); 
alert(abc);

var atLeastOneIsChecked = jQuery('input[name="addon-"'+abc+']:checked').length ;
alert(atLeastOneIsChecked);

But it not worked It should be after concatenate like below

var atLeastOneIsChecked = jQuery('input[name="addon-base-bar2[]"]:checked').length;

Answer 1

var atLeastOneIsChecked = jQuery('input[name="addon-"'+abc+']:checked').length;
                                                    ^
                                                    |

You used the closing " at the wrong place

var atLeastOneIsChecked = jQuery('input[name="addon-'+abc+'"]:checked').length;
                                                           ^
                                                           |

Answer 2

Try this -

var atLeastOneIsChecked = jQuery("input[name='addon-"+abc+"']:checked").length ;