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How to add property to an array of objects with JavaScript?

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To add property to an array of objects with JavaScript, we use the map method.

For instance, we write

const mapped = results.map((obj) => ({ ...obj, active: "false" }));

to call results.map with a callback that returns an object with the original object obj‘s properties spread into a new object and we add the active property to it.

Then an array is returned with the original objects in results with the active property added.

By John Au-Yeung

Web developer specializing in React, Vue, and front end development.

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