il3ven/debug-logger

Assignment

debug-logger

This is a small 1 hour assignment to test JavaScript skills.

debug-logger is a logger. It allows you to filter logs using a environment variable.

Example

const Logger = require('./logger.js')

const logger1 = new Logger('unique-id-1')
const logger2 = new Logger('unique-id-2')
const logger2 = new Logger('id-is-unique')

logger1.log('logging using logger 1')
logger2.log('logging using logger 2')
logger3.log('logging using logger 3')

Using the DEBUG environment variable we can toggle logs

DEBUG can be a string or regular expression.

1. Output for DEBUG=unique-id-1 node .

   Since DEBUG was set to unique-id-1, only logger1 will log.

   logging using logger 1
   

2. Output for DEBUG=unique-id.* node .

   Since DEBUG was set to unique-id.*, the regular expression matches logger 1 and logger 2. Hence, the logger1 and logger2 logs are printed.

   logging using logger 1
   logging using logger 2
   

API

• new Logger(id, transformFunction) - Creates a new logger.
  • id: The id of the logger used to toggle logs.
  • transformFunction: A function that transforms the log message.
• Logger.log(message1, message2, ....) - Logs the given message.