Rust Vectors

Lots I don't understand but they basically work.

Git repo: https://github.com/caveofprogramming/rust/

Creating Vectors

Vectors store values of the same type.

We can create an empty vector using Vec::new() and then add items to it with push().

It’s also possible to initialise a vector using the vec! macro.

Retrieving Items from Vectors

There are two ways we can get items out of a vector: using a subscript in square brackets, or using get().

The get() function retrieves an Option, and we can obtain the actual value using if let or match.

A key difference is that if we try to access an item that’s not in the vector, the first technique will cause the program to terminate with an error message when it runs, while the second method would give us a valid Option, which in this case would then contain “unknown”.

Looping Over Vectors

We can loop over vectors with a for loop.

It’s possible to modify items in vectors via the references we obtain for them from the vector, even while looping.

In this case we have to use a * to dereference the object to be modified.

Problems with Modification

Modifying a vector requires a mutable reference, and we can’t have one of those if we’ve got an immutable reference still in scope.

Using Enums in Vectors

We can use enums to store different types of things in vectors.