Log the given prefix and value, then return value. Useful for debugging functional pipelines.
#Example Usage:
const tapLog = require('tap-log')
const R = require('ramda')
R.pipe(
R.add(2),
tapLog(),
R.multiply(3),
tapLog('final answer')
)(3)
// -> outputs '5' and 'final answer: 15' to console & evaluates to 15