Remove Object From A Javascript Array Duplicate

Duplicate elements can sometimes wreak havoc on our code, especially when working with JavaScript arrays. Luckily, there's a straightforward solution to help you remove duplicate objects from an array in JavaScript.

To kick things off, let's start by defining a sample array containing duplicate objects that we want to clean up:

let arrayWithDuplicates = [
  { id: 1, name: 'Alice' },
  { id: 2, name: 'Bob' },
  { id: 1, name: 'Alice' },
  { id: 3, name: 'Charlie' },
  { id: 2, name: 'Bob' }
];

One efficient way to remove duplicate objects from this array is to utilize the `filter()` method in combination with `map()` and a temporary Map. Here's the step-by-step process that will help us achieve our goal:

1. Define a new empty Map to store unique objects based on a unique key in each object. In our case, we can use the `id` property as the unique identifier.

let uniqueMap = new Map();

2. Use the `filter()` method on the array to loop through each object and check if the object's `id` property exists in the `uniqueMap`. If not, add the object to the `uniqueMap`.

let uniqueArray = arrayWithDuplicates.filter(obj => !uniqueMap.has(obj.id) && uniqueMap.set(obj.id, obj));

3. Finally, extract the resulting unique objects from the `uniqueMap` using the `values()` method and convert it back to an array using the spread operator `...`.

let finalArrayWithoutDuplicates = [...uniqueMap.values()];

With these simple steps, you have successfully removed duplicate objects from the original array. Here's the complete code in one go:

let arrayWithDuplicates = [
  { id: 1, name: 'Alice' },
  { id: 2, name: 'Bob' },
  { id: 1, name: 'Alice' },
  { id: 3, name: 'Charlie' },
  { id: 2, name: 'Bob' }
];

let uniqueMap = new Map();
let uniqueArray = arrayWithDuplicates.filter(obj => !uniqueMap.has(obj.id) && uniqueMap.set(obj.id, obj));
let finalArrayWithoutDuplicates = [...uniqueMap.values()];

console.log(finalArrayWithoutDuplicates);

By following these clear steps, you can efficiently remove duplicate objects from a JavaScript array. This technique is not only effective but also helps in optimizing your code and ensuring the uniqueness of data in your arrays. Remember, keeping your code clean and concise is the key to effective programming!