exercism/rust/semi-structured-logs

Semi Structured Logs

Welcome to Semi Structured Logs on Exercism's Rust Track. If you need help running the tests or submitting your code, check out HELP.md. If you get stuck on the exercise, check out HINTS.md, but try and solve it without using those first :)

Introduction

Enums, short for enumerations, are a type that limits all possible values of some data. The possible values of an enum are called variants. Enums also work well with match and other control flow operators to help you express intent in your Rust programs.

Instructions

In this exercise you'll be generating semi-structured log messages.

1. Emit semi-structured messages

You'll start with some stubbed functions and the following enum:

#[derive(Clone, PartialEq, Debug)]
pub enum LogLevel {
    Info,
    Warning,
    Error,
}

Your goal is to emit a log message as follows: "[<LEVEL>]: <MESSAGE>". You'll need to implement functions that correspond with log levels.

For example, the below snippet demonstrates an expected output for the log function.

log(LogLevel::Error, "Stack overflow")
// Returns: "[ERROR]: Stack overflow"

And for info:

info("Timezone changed")
// Returns: "[INFO]: Timezone changed"

Have fun!

2. Optional further practice

There is a feature-gated test in this suite. Feature gates disable compilation entirely for certain sections of your program. They will be covered later. For now just know that there is a test which is only built and run when you use a special testing invocation:

cargo test --features add-a-variant

This test is meant to show you how to add a variant to your enum.

Source

Created by

• @efx