Sep 2, 2015 · function isUnique(arr) { const isAllUniqueItems = input.every((value, index, arr) => { return arr.indexOf(value) === index; //check if any duplicate value is in other index }); return …

Apr 7, 2025 · In JavaScript, array methods such as filter () and indexOf () can be used to find duplicates in a concise way. filter () creates a new array containing elements that satisfy a …

Oct 29, 2013 · function checkIfArrayIsUnique(myArray) { for (var i = 0; i < myArray.length; i++) { for (var j = i+1; j < myArray.length; j++) { if (myArray[i] == myArray[j]) { return true; // means …

Mar 14, 2022 · To find duplicates in an array using JavaScript, the Set object combined with the has() method offers an effective solution. A Set is a collection of unique values, and the has() …

Jul 3, 2021 · Learn how to check if an array contains duplicate values using indexOf(), set object, and iteration in JavaScript.

Learn how to find duplicate values in a JavaScript array with this comprehensive guide, including examples and step-by-step instructions.

Mar 2, 2024 · Use the Array.map() method to get an array of the values of the relevant object property. Use the Array.some() method to check if each value is contained multiple times in …

Feb 27, 2025 · 1. Using a Set for Efficient Duplicate Detection. JavaScript’s Set object is perfect for detecting duplicates because it stores only unique values. By iterating over the array and …

Aug 10, 2020 · Here are few methods to check the duplicate value in javascript array. Method 1. Using an object. A javascript object consists of key-value pairs where keys are unique. If you …

Jan 9, 2025 · To Remove the elements from an array we can use the JavaScript set method. Removing duplicate elements requires checking if the element is present more than one time …