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Instructions

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 LogLevel initializer to parse the log level of a log line:

LogLevel("[INF]: File deleted")
// => LogLevel.info
LogLevel("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"