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JavaScript Debug Arrow Function Expressions

Sathvik Reddy
Sathvik Reddy
6,223 Points

Third (Last) Function

Isn't the least verbose way of writing the printDate() function as follows?

const printDate = date => console.log(date);

^since there is only one line of code in the function.

Your syntax shows:

const printDate = date => {
     console.log(date);
}
Andreas Nyström
Andreas Nyström
8,887 Points

One-upping the teachers ey? Well done :).

Sathvik Reddy
Sathvik Reddy
6,223 Points

Andreas Nyström - haha, wasn't trying to be a smarta**. Just wanted to make sure I was understanding arrow functions correctly ;)

Rich Donnellan
Rich Donnellan
Treehouse Moderator 27,696 Points

Question updated with code formatting. Check out the Markdown Cheatsheet link below the "Add an Answer" for syntax examples.

3 Answers

Steven Parker
Steven Parker
230,248 Points

There's a slight difference, the briefer form actually translates to this:

const printDate = date => {
    return console.log(date);
}

But in this case there's no practical difference since "console.log" doesn't return anything.

@Steven Parker , I find this weird since in the video you're explicitly told about refactoring on arrow functions that have only 1 line of code in the code block .The syntax supports that it can be on 1 line and no curly brackets are needed.

When arrow functions have 1 parameter no parentheses are needed either.

So wouldn't the ultimate refactor be

const printDate = date => console.log(date);

It's seems to work fine when outputted in the console. I am just wondering if I am missing something here.

Steven Parker
Steven Parker
230,248 Points

It works just fine, I was just pointing out that the equivalent conventional function would include a return.

But as I said, it's not important in this case since there's no value to return.

I got confused with the third function too, However if you made it here, it means you were paying attention. :)

same here. I think

const printDate = date => console.log(date);

would be the finished version in the context of this exercise.