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Learning Exercise
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 built-in methods. For example, to remove the whitespace from a string, you can use the Trim method like this:
string name = " Jane "
name.Trim()
// => "Jane"
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!"
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:
INFOWARNINGERRORYou have three tasks, each of which will take a log line and ask you to do something with it.
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"
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"
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)"
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