instructions.md

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

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

These are the different log levels:

• TRC (trace)
• DBG (debug)
• INF (info)
• WRN (warning)
• ERR (error)
• FTL (fatal)

You have three tasks, each of which need to be completed to provide the necessary functionality.

1. Create LogLevel enum

Define a LogLevel enum that has six cases corresponding to the above log levels, plus an unknown case for levels with missing or non-standard log levels.

• trace
• debug
• info
• warning
• error
• fatal
• unknown

2. Parse log level

Next, implement the LogLine initializer to parse the log level of a log line:

LogLine("[INF]: File deleted")
// => LogLevel.info
LogLine("Something went wrong!")
// => LogLevel.unknown

3. Convert log line to short format

The log level of a log line is quite verbose. To reduce the disk space needed to store the log lines, a short format is developed: "<ENCODED_LEVEL>:<MESSAGE>".

The encoded log level is simple mapping of a log level to a number:

• trace - 0
• debug - 1
• info - 4
• warning - 5
• error - 6
• fatal - 7
• unknown - 42

Implement the shortFormat(message: String) -> String method that can output the shortened log line format as a String:

let overflow = LogLevel.error
overflow.shortFormat(message: "Stack overflow")
// => "6:Stack overflow"