Answer by bvdb for Why do empty JavaScript arrays evaluate to true in conditional structures?

While [] equals false, it evaluates to true.

yes, this sounds bad or at least a bit confusing. Take a look at this:

const arr = [];if (arr) console.log("[] is truethy");if (arr == false) console.log("however, [] == false");

In practice, if you want to check if something is empty,then check the length. (The ?. operator makes sure that also null is covered.)

const arr = []; // or null;if (!arr?.length) console.log("empty or null")