How can I efficiently extract unique values from a JavaScript array?

Efficient Retrieval of Unique Values from JavaScript Arrays

The need to extract unique values from arrays is a common programming task. While traditional methods often involve creating a second array, there's an alternative that leverages JavaScript's powerful data structures.

One such solution utilizes the Set object, which only stores unique values. By combining it with the spread operator ..., you can create a concise and efficient solution.

Solution:

const a = [1, 1, 2];
const uniqueValues = [...new Set(a)];

This code creates a new Set object with all the values from the original array. As Sets only allow unique values, duplications are automatically eliminated. By spreading the Set into a new array, you obtain the unique values as the output.

This solution is particularly elegant in ES6 due to the use of the spread operator, making it both clean and performant. It simplifies the process of extracting unique values from arrays, without the need for additional libraries or complex data structures.

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