what is this code doing?

[Reza Razavipour]

I am seeing this code snippet in  a logging node module and I do not understand what it is doing?

Can you explain?

var LEVEL = {
  "TRACE": 10,
  "DEBUG": 20,
  "INFO": 30,
  "WARN": 40,
  "ERROR": 50,
  "FATAL": 60
};
for (var l in LEVEL) {
  LEVEL[LEVEL[l].toString()] = l;
}

[Luiz Filipe]

This build a double map similar to

var LEVEL={
   "TRACE": 10,
   "10": "TRACE"
    ...
}

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[Angel Java Lopez]

Ummm... variable l takes the values "TRACE", "DEBUG", ... from the names in LEVEL

Then LEVEL[l] takes the values 10, 20, 30, ....

The values are converted to string

Then

Level["10"] = "TRACE";

Level["20"] = "DEBUG";

and so on

It's making the "inverse dictionary"

Angel "Java" Loepz

@ajlopez

--

[Martin Gonzalez]

{ '10': 'TRACE',

  '20': 'DEBUG',

  '30': 'INFO',

  '40': 'WARN',

  '50': 'ERROR',

  '60': 'FATAL',

  TRACE: 10,

  DEBUG: 20,

  INFO: 30,

  WARN: 40,

  ERROR: 50,

  FATAL: 60 }

I'm guessing its a translator object.

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Martin

[Luiz Filipe]

Yeah the correct name is inverse reverse or translator

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