exercism.org/csharp/log-levels/README.md

Log Levels

Welcome to Log Levels on Exercism's C# 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

Strings

A string in C# is an object that represents immutable text as a sequence of Unicode characters (letters, digits, punctuation, etc.). Double quotes are used to define a string instance:

string fruit = "Apple";

Strings are manipulated by calling the string's methods. Once a string has been constructed, its value can never change. Any methods that appear to modify a string will actually return a new string.

Multiple strings can be concatenated (added) together. The simplest way to achieve this is by using the + operator.

string name = "Jane";
"Hello " + name + "!";
// => "Hello Jane!"

For any string formatting more complex than simple concatenation, string interpolation is preferred. To use interpolation in a string, prefix it with the dollar ($) symbol. Then you can use curly braces ({}) to access any variables inside your string.

string name = "Jane";
$"Hello {name}!";
// => "Hello Jane!"

Instructions

In this exercise you'll be processing log-lines.

Each log line is a string formatted as follows: "[<LEVEL>]: <MESSAGE>".

There are three different log levels:

• INFO
• WARNING
• ERROR

You have three tasks, each of which will take a log line and ask you to do something with it.

1. Get message from a log line

Implement the (static) LogLine.Message() method to return a log line's message:

LogLine.Message("[ERROR]: Invalid operation")
// => "Invalid operation"

Any leading or trailing white space should be removed:

LogLine.Message("[WARNING]:  Disk almost full\r\n")
// => "Disk almost full"

2. Get log level from a log line

Implement the (static) LogLine.LogLevel() method to return a log line's log level, which should be returned in lowercase:

LogLine.LogLevel("[ERROR]: Invalid operation")
// => "error"

3. Reformat a log line

Implement the (static) LogLine.Reformat() method that reformats the log line, putting the message first and the log level after it in parentheses:

LogLine.Reformat("[INFO]: Operation completed")
// => "Operation completed (info)"

Source

Created by

• @ErikSchierboom

Contributed to by

• @yzAlvin