input checkbox checked array function object error

it just doesn't error when i use only name=myCheckbox

function example(){
    
    var arr = $.map($('input[name=myCheckbox]:checkbox:checked'), function (e, i) {
        return +e.value;
    });
         return arr;
}

I need to use "id" in javascript. but I'm getting an error.

function example(id){
    
    var arr = $.map($('input[name=myCheckbox'+id+']:checkbox:checked'), function (e, i) {
        return +e.value;
    });
         return arr;
}

Uncaught Error: Syntax error, unrecognized expression: input[name=myCheckbox[object Object]]:checkbox:checked

How can I fix? Sorry my lang. Thank you..