Protip: Compute the size before you allocate

I've lost track of how many times I've seen code that uses a dynamically-expanding array when it could've easily calculated the correct size and allocated exactly the right amount. See: string appending, tokenising, just about everything written in JavaScript, etc.

No wonder software is so slow and bloated...

Look, it's often easier to just call an "add a single item" function in a loop. Don't optimize low-level data structures until you know there's not a lower-hanging fruit.