Explicit check for empty arrays before using Array.every() - #339

Thanks for the contribution, but this check can't be triggered here.

Point is declared as a fixed-length tuple:

export type Point = [number, number, number];

so p1.length and p2.length are both typed as 3 — the p1.length !== p2.length branch is unreachable and only adds dead code to the teacher's solution. Your point about every() returning true for an empty array is correct in general, but this lesson is specifically about tuples guaranteeing the length at the type level: an empty Point cannot be constructed in the first place.

Also, the added blank line has trailing whitespace, which would fail make code-lint (biome).

Closing this one, but thanks for looking into the lesson — issues and PRs on the content are always welcome.