JSFiddle - React, Tailwind, and code Playground

by velmurugansp

JavaScript

function findDuplicates(arr){
	let duplicates = [];
  arr.forEach(function(value, index, arrClone){
  	let nextLayer = arrClone.slice(index+1);
    if(nextLayer.indexOf(value) >= 0){
    	duplicates.push(value);
    }
  });
  return duplicates;
}
let givenArray = [100, 4, 6, 7, 15, 9, 15, 4, 100, 6];
let result = findDuplicates(givenArray);

console.log(result);