std::vec

Struct Vec

The capacity of a vector is the amount of space allocated for any future elements that will be added onto the vector. The length of a vector specifies the number of actual elements within the vector.

Vec indexing

direct indexing (v[index]) returns the value, explicit reference &v[index] returns a borrow. v[index] computes the memory offset as $let offset = index * std::mem::size_if::();$, this is why usize is used for indexing.

the end of the Vec acts as the top (right)

So when say a stack bottom to up, it means left to right.

vec.len() -> usize