How to use filter() and findIndex() Methods In Javascript
In this method, we will filter() the array by using the Array.findIndex() method to return the first index of the element in a given array that satisfies the provided testing function (passed in by the user while calling)
Example: This example is the implementation of the above-explained method.
const books = [
{ title: "C++", author: "Bjarne" },
{ title: "Java", author: "James" },
{ title: "Python", author: "Guido" },
{ title: "Java", author: "James" },
];
const unique = books.filter((obj, index) => {
return index === books.findIndex(o => obj.title === o.title);
});
console.log(unique);
Output
[ { title: 'C++', author: 'Bjarne' }, { title: 'Java', author: 'James' }, { title: 'Python', author: 'Guido' } ]
How to Remove Duplicates from an Array of Objects in JavaScript?
This article focuses on removing duplicate object elements from the JavaScript array. We are provided with an array of objects, and our goal is to eliminate duplicate objects from the list.
These are the methods to solve this problem which are discussed below:
Table of Content
- Using One of the keys as Index
- Converting Array to Set and Remove Duplicates
- Using filter() and includes() Methods
- Using filter() and findIndex() Methods
- Using Lodash _.uniq() Method