temp

dup

import React from "react";

const Duplicates = ({ numberList }) => {

    let duplicates = []
    let uniques = []
    let hashMap = {}

    numberList.forEach(element => {
        if (hashMap[element]) {
            hashMap[element] += 1;
        } else {
            hashMap[element] = 1;
        }
    })

    Object.keys(hashMap).forEach(element => {
        if (hashMap[element] > 1) {
            duplicates.push(element);
        } else {
            uniques.push(element);
        }
    })

    return (
        <>
            Duplicates: {duplicates.join(", ")} <br/>
            uniques: {uniques.join(", ")}
        </>
    )
}

export default Duplicates;

gistfile1.txt

  const [numberList, setNumberList] = useState([]);
  
  const submitNumberList = (e) => {
    e.preventDefault();
    setNumberList(e?.target?.[0]?.value?.split(","));
  }

<h3>Duplicate numbers</h3>
        <form onSubmit={submitNumberList}>
          <input type="text" name="numberlist" placeholder="list of numbers: 1,2,3,4,5" />
          <input type="submit" value="Submit" />
        </form>
        {
          numberList?.length !== 0 &&
          <Duplicates numberList={numberList} />
        }