Sep 2, 2015 · If you only need string values in the array, the following will work: function hasDuplicates(array) { var valuesSoFar = Object.create(null); for (var i = 0; i < array.length; …

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 …

Mar 2, 2024 · Use the Array.some() method to iterate over the array. Check if the index of the first occurrence of the current value is NOT equal to the index of its last occurrence. If the condition …

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

Mar 14, 2022 · To find duplicates in an array using JavaScript, combining the filter() and indexOf() methods provides an elegant solution. The filter() method creates a new array with all …

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

Mar 24, 2020 · Learn 5 different ways to check if an array contains duplicate elements with example and explanation.

Jun 9, 2015 · To find all duplicates in a JavaScript array of objects based on a specific property (in this case, "name"), you can use a combination of reduce() and filter() functions.

Dec 19, 2024 · Given an array of n integers. The task is to find all elements that have more than one occurrences. The output should only be one occurrence of a number irrespective of the …

Sep 7, 2021 · To eliminate duplicates, the filter () method is used to include only the elements whose indexes match their indexOf values, since we know that the filer method returns a new …