How to retrieve checkboxes values in jQuery

Question

How to use jQuery to get the checked checkboxes values, and put it into a textarea immediately?

Just like this code:

  
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Answer 1

 function updateTextArea() {         
     var allVals = $('#c_b :checked').map(function() {
       return $(this).val();
     }).get();
     $('#t').val(allVals)
  }
 $(function() {
   $('#c_b input').click(updateTextArea);
   updateTextArea();
 });