![]() If you are curious about other ways Map can help you optimize your code, I've written a separate article: Simplifying Code with Maps In JavaScript and React. This involves wrapping an existing array in a Set and then converting it back to an array. Removing duplicate items from an array in JavaScript is a common practice, and one way to achieve this is by using the Set constructor. Removing duplicates from an array with Set We'll also walk through a real-world use case for Map, demonstrating how it can be used to efficiently collect unique values from an array of objects in a React app. In this article, we'll explore an alternative approach using the Map data structure, which maintains key uniqueness, to solve this problem. As a result, all values in the array have distinct references (unless an object/array is declared externally and referenced multiple times within the array), resulting in the original array remaining unchanged when converted to Set. This is because Set stores either primitive values or object references. However, while it works great for arrays of primitive values, it doesn't work as expected for arrays of arrays or objects. ![]() ![]() Removing duplicates from an array is a common task in JavaScript development, and using the Set constructor is a popular way to achieve this.
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