How to Write the Output of Node.js Modules to a File

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Understanding the Problem

However, when you attempt to write the output, you encounter an error message like this:

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

This error occurs because of how the output values are being returned from your functions. Let’s dig into the root cause and find a solution.

Analyzing Your Modules

You have two modules defined as follows (we'll focus primarily on the prime numbers module):

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

Issues with Current Implementation

Function Not Returning the Value: In your primes function, you're calling isPrime() but not returning its value. The output of isPrime() is effectively lost. As a result, primes() will return undefined.

Proper String Conversion: While toString() is used, the outer function must return the result of the inner function to effectively pass the string to your file writing logic.

The Solution

The solution to your problem is simple. You need to ensure that your primes function returns the string output from the isPrime function. Here’s how you can modify the code:

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

Updated File Writing Code

Ensure your main file looks similar to the following:

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

Conclusion

Start applying these changes and watch your program work successfully! Happy coding!