javascript - Can not check if input has value or not -


i want loop through array of ids , check if value exists or not , stuff code below: 

function checkbillingfields() {  var inputids = [ "#billing_first_name", "#billing_last_name", "#billing_company", "#billing_phone", "#billing_address_1", "#billing_address_2", "#billing_city", "#billing_city"];  var arraylength = inputids.length;  (var = 0; < arraylength; i++) {      console.log(inputids[i]);      if ($("inputids[i]").val().length == 0){          $('.woocommerce-billing-fields__field-wrapper').appendto('.billing-fields');          $(".billing-heading").css({'margin-top': '100px'});      }else{         $(".expand-billing").css({'display': 'none'});     }  }  }  checkbillingfields();

i error cannot read property 'length' of undefined. use local storage store inputs , works fine tested.

any ideas helpful been researching , trying fix nothing worked.

just console.log() use same in if statement

console.log(inputids[i]);  if ($(inputids[i]).val().length == 0){

inputids[i] // returns #billing_first_name if = 0
"inputids[i]" return "inputids[i]"


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