Solving the TypeError: Cannot read property 'question' of undefined in Node.js Applications

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Understanding the TypeError: Can’t Read Property 'question' of Undefined

The Problem

You’re building a client/server application and while implementing a function to extract random questions from an array, you run into this error. Here’s a brief overview of the problematic function:

[[See Video to Reveal this Text or Code Snippet]]

The Core Issue: Incorrect Index Range

Fixing the Code

To address this issue, you need to adjust the max value in the random index generation to one less than the length of the array. Change your line of code to the following:

[[See Video to Reveal this Text or Code Snippet]]

Updated Function

Here’s what the corrected extractQuestions method looks like:

[[See Video to Reveal this Text or Code Snippet]]

Conclusion

This simple fix eliminates the TypeError and allows your application to run smoothly when trying to extract random questions. By ensuring the maximum index for random selection is accurate, you maintain robustness in your application's functionality.

If you encounter similar index-related issues in the future, always double-check the maximum bounds of your arrays to avoid accessing undefined elements. Happy coding!