How to use One of the keys as Index In Javascript
- A temporary array is created that stores the objects of the original array using one of its keys as the index.
- Any of the object properties can be used as a key. The key is extracted from the object and used as the index of the new temporary array.
- The object is then assigned to this index.
- This approach will remove the duplicate objects as only one of each object of the original array will get assigned to the same index.
Example: This example is the implementation of the above-explained method.
function removeDuplicates() {
// Create an array of objects
books = [
{ title: "C++", author: "Bjarne" },
{ title: "Java", author: "James" },
{ title: "Python", author: "Guido" },
{ title: "Java", author: "James" },
];
// Declare a new array
let newArray = [];
// Declare an empty object
let uniqueObject = {};
// Loop for the array elements
for (let i in books) {
// Extract the title
objTitle = books[i]['title'];
// Use the title as the index
uniqueObject[objTitle] = books[i];
}
// Loop to push unique object into array
for (i in uniqueObject) {
newArray.push(uniqueObject[i]);
}
// Display the unique objects
console.log(newArray);
}
removeDuplicates();
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