With JavaScript 1.6 / ECMAScript 5 you can use the native filter method of an Array in the following way to get an array with unique values: function onlyUnique(value, index, array) { return array.indexOf(value) === index; } // usage example: var a = ['a', 1, 'a', 2, '1']; var unique = a.filter(onlyUnique); console.log(unique); // ['a', 1, 2, '1']

Mar 5, 2015 · You can enter array with duplicates and below method will return array with unique elements.

Nov 14, 2024 · There are various approaches to remove duplicate elements, that are discussed below. 1. Using set () – The Best Method. Convert the array into a Set in JS, which stores unique values, and convert it back to an array. 2. Using for Loop with includes () Method.

Feb 28, 2013 · var unique = array .map(p => p.age) .filter((age, index, arr) => arr.indexOf(age) == index) .sort(); // sorting is optional // or in ES6 var unique = [...new Set(array.map(p => p.age))]; // or with lodash var unique = _.uniq(_.map(array, 'age'));

Jul 2, 2024 · Using `Array.filter()` with a callback that checks if an element’s index is equal to its first occurrence’s index in the array (`Array.indexOf()`), the function filters out duplicate elements. The resulting array’s length equals the original if it contains only unique values.

Jun 23, 2023 · In this post, we will be looking at the following 3 ways to get unique values from an array in JavaScript: By using the Set object; By using the filter() array method; By using the reduce() array method; Let’s explore each… #1 – By using the Set object. The Set object in JavaScript allows you to store unique values of any type.

Sep 3, 2023 · One of the easiest ways to remove duplicate values from an array is by using the Set object, which only allows unique values. We can convert the array to a Set and then convert it back to an array to get the unique values. const array = [1, 2, 3, 3, 4, 4, 5]; const uniqueArray = Array.from(new Set(array)); console.log(uniqueArray);

Mar 30, 2020 · The Array.filter function takes a callback whose first parameter is the current element in the operation. It also takes an optional index parameter and the array itself. Combining these, we can use Array.filter to ensure only unique element are returned in the array

Aug 11, 2021 · const array: string[] = [ 'Scooby', 'Dooby', 'Dooby', 'Doo' ]; const uniques: string[] = []; for (const value of array) {let exists = false; for (const unique of uniques) { if (unique === value)...

Jun 10, 2024 · Here are five ways to get all unique values from an array in JavaScript : Using new Set() constructor ,Using filter() + indexOf() methods ,Using filter() method , Using Set and Array.from() a method and Defining custom Array Unique Prototype