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JavaScript Build a Simple Dynamic Site with Node.js Creating a Simple Server in Node.js Preparing & Planning

Samuel Kleos
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Samuel Kleos
Front End Web Development Techdegree Student 12,719 Points
Posted by Samuel Kleos
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Samuel Kleos
Front End Web Development Techdegree Student 12,719 Points

Why does console.dir have no argument?

The code in the video at 4:05 reads as follows: 

studentProfile.on("end", console.dir);

I don't understand how a reference to the console.dir method is passed in because I cannot see how a response body is being passed into console.dir.

Shouldn't it be like below?:

studentProfile.on("end", (res) => console.dir(res));

1 Answer

Steven Parker
Steven Parker
229,786 Points
Steven Parker
Steven Parker
229,786 Points

That would work, but it creates an unnecessary anonymous function that has no purpose but to call console.dir. The anonymous function relies on being passed the event object just as console.dir does if you use it by itself as the callback.

Remember that when you define the handler, you only name the function. But when it is actually called, the system will pass the object to it as the argument.