JSFiddle - React, Tailwind, and code Playground

HTML

<script>
  var internal = 'WKF1';
    
  Daily = [WKF1,WKF2,WKF3,WKF3,WKF4,WKF5];
  Weekly = [WKF6,WKF7,WKF8];
  Monthly = [WKF9,WKF10];
    
    function frequency(wkf, array) {
    if (wkf in //arrays daily weekly monthly ) {
    return //array name
        }
    }

</script>