How can I debug map errors in JavaScript?

How can I debug map errors in JavaScript?

To debug map errors in JavaScript, start by checking the function you pass to the map method. Ensure it returns the expected value.

What if the map function is returning undefined?

If the map function returns undefined, check if the callback function is correctly implemented and that you're not trying to access properties of undefined.

Can you give me an example of a common mistake?

Sure! A common mistake is trying to access a property of an object that doesn't exist. For example, if you have an array of objects and one object is missing a property, it will return undefined.

How can I handle such cases gracefully?

You can use optional chaining or a default value. For example, use obj?.property || defaultValue to avoid errors.