JSFiddle - React, Tailwind, and code Playground

by davehol

JavaScript

function hasDuplicates(arr) {
    return arr.some(x => arr.indexOf(x) !== arr.lastIndexOf(x));
}
 
var arr =  "[email protected],[email protected],[email protected], [email protected],[email protected]";
arr = arr.split(",");
 
if (hasDuplicates(arr)) {
    console.log("Duplicate elements found.");
}
else {
    console.log("No Duplicates found.");
}