perf: use for loop over for...of loop

[Fdawgs]

for...of has an iterator overhead.

A traditional loop is faster because there are no intermediate objects created or function calls during iteration.
With the length being cached, there are no property lookups either.

See https://github.com/kibertoad/nodejs-benchmark-tournament for supporting benchmarking.

Checklist

• Run npm test
• Commit message adheres to the Conventional commits style, following the @commitlint/config-conventional config