some basic SQL and Java questions and a lot of whiteboard questions, how would you remove non repeating chars from String

Question

Sigiloso · Accepted Answer

const str = 'teeth_foot';
const removeNonDuplicate = str => {
   const strArray = str.split("");
   const duplicateArray = strArray.filter(el => {
      return strArray.indexOf(el) !== strArray.lastIndexOf(el);
   });
   return duplicateArray.join("");
};
console.log(removeNonDuplicate(str));

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