How to use Object Key for Tracking Unique Objects In Javascript
This method uses an object to track and store unique objects based on a specified attribute. The keys of the object are the values of the specified attribute, ensuring uniqueness.
Syntax:
let newArray = array.reduce((acc, current) => {
// logic to track unique objects
return acc;
}, {});
Example:
// Input array
let arr = [
{ articleId: 101, title: "Introduction to JavaScript" },
{ articleId: 102, title: "Arrays in JavaScript" },
{ articleId: 101, title: "Introduction to JavaScript" },
{ articleId: 103, title: "Functions in JavaScript" },
];
// Using an object key to track unique objects
let uniqueObjects = {};
arr.forEach(obj => {
uniqueObjects[obj.articleId] = obj;
});
let output = Object.values(uniqueObjects);
// Output
console.log(output);
// Nikunj Sonigara
Output
[
{ articleId: 101, title: 'Introduction to JavaScript' },
{ articleId: 102, title: 'Arrays in JavaScript' },
{ articleId: 103, title: 'Functions in JavaScript' }
]
How to Return an Array of Unique Objects in JavaScript ?
Returning an array of unique objects consists of creating a new array that contains unique elements from an original array. We have been given an array of objects, our task is to extract or return an array that consists of unique objects using JavaScript approaches. There are various approaches through which it can be performed which are as follows:
Table of Content
- Using Set
- Using filter Method
- Using reduce Method
- Using map Method
- Using Object Key for Tracking Unique Objects