Implement new Concept Exercise: loops

[workingjubilee]

This issue describes how to implement the loops concept exercise for the Rust track.

Getting started

Please please please read the docs before starting. Posting PRs without reading these docs will be a lot more frustrating for you during the review cycle, and exhaust Exercism's maintainers' time. So, before diving into the implementation, please read up on the following documents:

• The features of v3.
• Rationale for v3.
• What are concept exercise and how they are structured?

Please also watch the following video:

• The Anatomy of a Concept Exercise.

Goal

This concept exercise should convey a basic understanding of loops in Rust. A complete review of all possible loops in a single exercise is infeasible. The primary goal is to introduce the student to the usage of for loops with the x..y pattern, which are the most common type of loop in Rust.

Learning objectives

Student should be able to...

• use a for loop
• understand the application of the 1..=x range pattern in a for loop

Student may be able to...

• use a conditional while loop
• use an infinite loop with a break condition

Out of scope

• more advanced control flow like while let loops
• explicit usage of iterators (even though this is an implicit usage of an iterator!)

Concepts

• loops
• ranges
• patterns

Prerequisites

This exercise should depend only on a basic understanding of functions and variables.

Resources to refer to

Hints

• For: https://doc.rust-lang.org/std/keyword.for.html

After

• Rust by Example (For and Range): https://doc.rust-lang.org/rust-by-example/flow_control/for.html
• The Rust Programming Language (Patterns and Loops): https://doc.rust-lang.org/book/ch18-01-all-the-places-for-patterns.html
• Rust Control Flow: https://doc.rust-lang.org/book/ch03-05-control-flow.html

Representer

This should require no special changes to the representer.

Analyzer

This should require no special changes to the analyzer.

Implementing

See our implementation guide for guidance. In addition you may want to make use of the shell script while in the concept directory, with the arg loops, e.g. sh boil_exercise.sh loops

Help

If you have any questions while implementing the exercise, please post the questions as comments in this issue.

[senekor]

After several failed attempts to create a high-quality syllabus, I believe any future attempts will have to do their own design work from scratch.