tee.js - console.log debugging for functional chains

tee.js

// for console.log debugging of functional chains
const tee = (pX, pN) => {
  console.error(pN, pX);
  return pX;
};

// plug into chains like so
lElaborateArray
  .filter(lowPass)
  .map(doStuff)
  .map(tee)
  .reduce(interestinglyeReduce);