| Vectors are re-sizable arrays, like slices their size is not known at compile |
| time, but they can grow or shrink at anytime. A vector is represented using |
| 3 words: a pointer to the data, its length and its capacity. The capacity |
| indicates how much memory is reserved for the vector, the vector can grow as |
| long as the length is smaller than the capacity, when this threshold needs to |
| be surpassed, the vector gets reallocated with a bigger capacity. |
| |
| {vec.play} |
| |
| More `Vec` methods can be found under the |
| [std::vec](http://doc.rust-lang.org/std/vec/) module |
