Remove unnecessary commas in the JavaScript function statements

[kkpan11]

The comma at the end of the last line in the JavaScript code snippet is not required and can be removed.

Description

In JavaScript, commas are used to separate elements in lists or objects. However, when there is no element after the last one in a list, it's not necessary to include a trailing comma. The code is perfectly valid and correct without the comma at the end of the expression.

Motivation

• Improve readability by removing unnecessary comma

[Josh-Cena]

Hi, code on MDN is automatically formatted and there's no point in hand-formatting them. Trailing commas are considered a good habit in engineering because when you add extra arguments the diff is cleaner

[kkpan11]

@Josh-Cena Thanks for the description. :)
So, even in the math statements like the following, right?

a +
b +
c +
d +
e,

[Josh-Cena]

The point is, the expression here is an argument to a function.

f(
  a +
    b +
    c,
);

[kkpan11]

@Josh-Cena Ah, I got the point that you are talking about.
But I look at the JavaScript source and check the documentation from MDN about Math.sqrt().
The Math.sqrt() function only takes 1 parameter not the arbitrary number of arguments.
My opinion is if the function only takes 1 parameter, shall we add the unmeaningful comma in the pure math statements instead of simple function call?

const distance = Math.sqrt(
    (point.x - sphere.x) * (point.x - sphere.x) +
      (point.y - sphere.y) * (point.y - sphere.y) +
      (point.z - sphere.z) * (point.z - sphere.z),
);

const distance = Math.sqrt(
    (point.x - sphere.x) * (point.x - sphere.x) +
    (point.y - sphere.y) * (point.y - sphere.y) +
    (point.z - sphere.z) * (point.z - sphere.z)
);

Or am I misunderstanding something?

Thanks for the kind clarification, Josh. 👍

[Josh-Cena]

This is purely a formatting concern. You shouldn't add extra semantics to formatting—it only complicates authoring because you have to make a conscious choice about whether you should add a comma in every place. Again, all of our formatting is automated so we can forget about these decisions altogether.

[kkpan11]

@Josh-Cena Got it, thanks for the clarifying. That's true about formatting automatically in the collaborative large documents.

Thanks!