JSFiddle - React, Tailwind, and code Playground

by maximua

JavaScript

var array = [6, 9, 15, 6, 13, 9, 11, 15];
var arrayResult = [];
const length = array.length;

function getDups(a) {
	for (let i = 0; i < length - 1; i++) {
  	for (let j = i + 1; j < length; j++) {
    	if (a[i] === a[j]) 
      {
      	arrayResult.push(a[i]);
			}
    }
	}
  return arrayResult;
}

alert(getDups(array));