FAQ: Introduction to Node.js - The Util Module

This community-built FAQ covers the “The Util Module” exercise from the lesson “Introduction to Node.js”.

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Learn Node.js

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Hi, I have a question.

In task 4 it says “inside of then(), log to the console”

The ${nickname} is ${mi} miles long!

But doesn’t it have to be: The ${track.nickname} is ${track.mi} miles long!

Thanks for any help


I think you’re right, it should be console.log(The ${trail.nickname} is ${trail.miles} miles long!) since the mi and nickname variables were only defined in the callback function that we’re trying to replace.
Besides, it’s not possible to pass this checkpoint using the variables.

This lesson somewhat confused me as to how the final code should look like if we make use of the promisify method. Are the initial function declaration getTrailDistance() (written as it is), the callback function and the promisified function suppose to cohabit together on the same file? Since we need to write const getTrailDistancePromise = util.promisify(getTrailDistance), I’m guessing we do need the initial getTrailDistance() to remain unchanged, but if I try to remove the callback function, I obviously get a reference error because we use callback in getTrailDistance() which is not defined anymore.

I assume that the aim is to only have the promisified function in the file and get rid of the old code, but I don’t see how to do that without getting reference errors. And the getTrailDistance() is referring to the callback which becomes obsolete when we decide to convert the callback to a promisified function, so why would we want to keep the code inside getTrailDistance() as it is?