shortening form validation jQuery code -

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i have written code, , works find, feel i'm being stupid here , shorten code. there anyway shorten this? please leave answer, thank you.

$('.submit-form').on('click' , function() {   if($('.form-signup1').val().length === 0) {    $('.form-signup1').addclass('error')  }   if($('.form-signup2').val().length === 0) {    $('.form-signup2').addclass('error')  }   if($('.form-signup3').val().length === 0) {    $('.form-signup3').addclass('error')  }   if($('.form-signup4').val().length === 0) {    $('.form-signup4').addclass('error')  }   if($('.form-signup5').val().length === 0) {    $('.form-signup5').addclass('error')  }   if($('.form-signup6').val().length === 0) {    $('.form-signup6').addclass('error')  }  });

edit: thank answers, appreciate time. chose 1 understand best. again!

add common class elements then

$('.submit-form').on('click', function () {     $('.form-signup').each(function () {         var $this = $(this);          if ($this.val().length === 0) {             $this.addclass('error');         }     })  });

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