Fun, furious, functional logging - flogging.js
This library is intended to make logging in functional programming a bit easier. It should play nicely with Ramda.
Please note: This library should still be considered experimental and functions may change at any time.
You are encouraged to read the source and use included libraries directly. Consider this like a Mercury-inspired logging collection.
Installing
npm i flogging --save
Usage
flogging = require('flogging')
R = require('ramda')
log = flogging.start_console_text_stream(process.stdout)
Logs the message and returns the value like it wasn't even there (the logger that is, your values are safe).
lower = R.pipe(
R.flip(R.divide(2)),
log.info('Halfway there'),
R.add(7)
)
what_it_is = lower(30)
// Sets `what_it_is` to 22.
// Prints `{"message": "Halfway there", "value": 15}` to the console.
It's good to clean up after yourself.
log.stop()
Object mode output
Use start_console_stream (note missing _text_) to output the logs to a Stream with objectMode: true.
concat_stream = require('concat-stream')
out_stream = concat_stream((array_of_log_objects) => console.log(array_of_log_objects))
log = flogging.start_console_stream(out_stream)
log.info('Super informational', 12)
log.stop()
I hope it is obvious that using concat-stream like this on all your logs is a bad idea.