Looping over Arrays: for vs. for-in vs. .forEach() vs. for-of

I’ve always wondered about for and for-in and foreach and for-of. Through my own trial and error, my perception has become:

• for is old school, what I learned in computer science 101
• forEach is what I’ll use most of the time, except when doing async stuff because await doesn’t work inside it
• for-in I use for async—or wait, should that be for-of? Meh, I’ll just use await Promise.all.

The lazy person in me finally gets to understand all the fors. Now we’ll just see if I can remember it.