is it correct?

[vinnitu]

node-webrtc-examples/lib/common/pitchdetector.js

Line 64 in f1d7b9a

return pairs(xs).reduce((y, [x1, x2]) => (x2 - x1) + y, 0) / xs.length;

maybe you mean?

function averageDifference(xs) {
  return pairs(xs).reduce((y, [x1, x2]) => (x2 - x1) + y, 0) (xs.length - 1);
}