What is the purpose of using the grouping operator in this particular line of code?

While exploring the express-session npm package source code, I came across this particular line:

// retrieve the session ID from the cookie
var cookieId = (req.sessionID = getcookie(req, name, secrets));

Do you think it's essentially the same as this line? :

// retrieve the session ID from the cookie
var cookieId = req.sessionID = getcookie(req, name, secrets);

What could be the reason behind this? Is it a coding style preference or am I overlooking something? Appreciate any insights. Thank you.

javascriptexpress

Answer №1

Certain code-checking tools may issue warnings if you forget to enclose an = expression in parentheses. This is because many users mistakenly type = instead of ==. Adding parentheses clarifies to the tool that it was a deliberate choice. Without them, the two lines have the same meaning.

Answer №2

It appears that the stylistic decisions are deliberate, as they clearly indicate that the single = is not a mistake for == or ===

foo = bar = 5;
faz = (baz = 5);

console.log({foo, bar});
console.log({faz, baz});

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