Insert dash after every 4th character in input

input_credit_card = function(input) {
  var format_and_pos = function(char, backspace) {
    var start = 0;
    var end = 0;
    var pos = 0;
    var separator = " ";
    var value = input.value;

    if (char !== false) {
      start = input.selectionStart;
      end = input.selectionEnd;

      if (backspace && start > 0) // handle backspace onkeydown
      {
        start--;

        if (value[start] == separator) {
          start--;
        }
      }
      // To be able to replace the selection if there is one
      value = value.substring(0, start) + char + value.substring(end);

      pos = start + char.length; // caret position
    }

    var d = 0; // digit count
    var dd = 0; // total
    var gi = 0; // group index
    var newV = "";
    var groups = /^\D*3[47]/.test(value) ? // check for American Express
      [4, 6, 5] : [4, 4, 4, 4];

    for (var i = 0; i < value.length; i++) {
      if (/\D/.test(value[i])) {
        if (start > i) {
          pos--;
        }
      } else {
        if (d === groups[gi]) {
          newV += separator;
          d = 0;
          gi++;

          if (start >= i) {
            pos++;
          }
        }
        newV += value[i];
        d++;
        dd++;
      }
      if (d === groups[gi] && groups.length === gi + 1) // max length
      {
        break;
      }
    }
    input.value = newV;

    if (char !== false) {
      input.setSelectionRange(pos, pos);
    }
  };

  input.addEventListener('keypress', function(e) {
    var code = e.charCode || e.keyCode || e.which;

    // Check for tab and arrow keys (needed in Firefox)
    if (code !== 9 && (code < 37 || code > 40) &&
      // and CTRL+C / CTRL+V
      !(e.ctrlKey && (code === 99 || code === 118))) {
      e.preventDefault();

      var char = String.fromCharCode(code);

      // if the character is non-digit
      // OR
      // if the value already contains 15/16 digits and there is no selection
      // -> return false (the character is not inserted)

      if (/\D/.test(char) || (this.selectionStart === this.selectionEnd &&
          this.value.replace(/\D/g, '').length >=
          (/^\D*3[47]/.test(this.value) ? 15 : 16))) // 15 digits if Amex
      {
        return false;
      }
      format_and_pos(char);
    }
  });

  // backspace doesn't fire the keypress event
  input.addEventListener('keydown', function(e) {
    if (e.keyCode === 8 || e.keyCode === 46) // backspace or delete
    {
      e.preventDefault();
      format_and_pos('', this.selectionStart === this.selectionEnd);
    }
  });

  input.addEventListener('paste', function() {
    // A timeout is needed to get the new value pasted
    setTimeout(function() {
      format_and_pos('');
    }, 50);
  });

  input.addEventListener('blur', function() {
    // reformat onblur just in case (optional)
    format_and_pos(this, false);
  });
};

input_credit_card(document.getElementById('credit-card'));

<form action="" method="post">
  <fieldset>
    <legend>Payment</legend>
    <div>
      <label for="credit-card">Credit card</label>
      <input id="credit-card" type="text" autocomplete="off" />
    </div>
  </fieldset>
</form>

function addDash(element) {
  let ele = document.getElementById(element.id);
  ele = ele.value.split('-').join(''); // Remove dash (-) if mistakenly entered.

  let finalVal = ele.match(/.{1,3}/g).join('-');
  document.getElementById(element.id).value = finalVal;
}

<input type="text" class="form-control" name="sector" id="sector" onkeyup="addDash(this)" required>

(function($, undefined) {

    "use strict";

    // When ready.
    $(function() {
        
        var $form = $( "#form" );
        var $input = $form.find( "input" );

        $input.on( "keyup", function( event ) {
            
            console.log('sss')
            // When user select text in the document, also abort.
            var selection = window.getSelection().toString();
            if ( selection !== '' ) {
                return;
            }
            
            // When the arrow keys are pressed, abort.
            if ( $.inArray( event.keyCode, [38,40,37,39] ) !== -1 ) {
                return;
            }
            
            var $this = $(this);
            var input = $this.val();
                    input = input.replace(/[\W\s\._\-]+/g, '');
                
                var split = 4;
                var chunk = [];
               
                for (var i = 0, len = input.length; i < len; i += split) {                              chunk.push( input.substr( i, split ) );
                }

                 console.log(chunk)
                $this.val(function() {
                    return chunk.join("-");
                });
        
        } );
        
        /**
         * ==================================
         * When Form Submitted
         * ==================================
         */
        $form.on( "submit", function( event ) {
            
            var $this = $( this );
            var arr = $this.serializeArray();
        
            for (var i = 0; i < arr.length; i++) {
                    arr[i].value = arr[i].value.replace(/[($)\s\._\-]+/g, ''); // Sanitize the values.
            };
            
            console.log( arr );
            
            event.preventDefault();
        });
        
    });
})(jQuery);

<script src="https://cdnjs.cloudflare.com/ajax/libs/jquery/3.3.1/jquery.min.js"></script>
<form id="form" method="post" action="">

        <label for="number">Enter number</label>
        <div class="flex">
            <input id="number" name="number" type="text" maxlength="15" />
        </div>

</form>