JSFiddle - React, Tailwind, and code Playground

by nevkatz

HTML

<div id="root">

</div>

JavaScript

if (true) {
  var arr = ['grape','pear','pear','orange','orange','apple','watermelon','watermelon','avocado'];
 }

const moreThanOnce = (item, pos, a) => {
  return a.lastIndexOf(item) != a.indexOf(item);
}
const elimDups = (item, pos, a) => {
  return a.indexOf(item) == pos;
}

var new_arr = arr.filter(moreThanOnce).filter(elimDups);

root.textContent = new_arr;