Rust Iterator Fundamentals: A Practical Guide

Always use a for loop iterator when dealing with a collection of predefined elements, which you need to navigate through. Rust offers a variety of iterators, making it ideal for this application. You can interact with an iterator in a few ways, iterating over existing items or adding new ones.

If you want to create your own iterator, you can, and Rust makes the procedure relatively straightforward. ordering the execution yourself can be a bit uncomfortable. It would be nicer if the language automatically understood the demand for a default iteration. The three types of iterators, itutter, iter, and itermute, all essentially function the same way.

They move through your collection. The regular 'iter' is usually recommended as it references existing data, aids performance and restricts changes to the list, thereby offering protection. Immutability benefits the speed of execution and safety, and is generally preferred for applications requiring efficient data access and a high level of precautions against mutations.

One downside though is the resultant error messages for attempted changes. Various options, including the 'into iter' and 'iter mute' approaches, are available for specific implementation requirements or constraints. 'Into iter' consumes the original data while 'iter mute' allows reading, editing, and further usage.