Skip to content

Instantly share code, notes, and snippets.

What would you like to do?
reddit 'hot' algorithm, in ruby, with typo fixed
require 'date'
# Actually doesn't matter WHAT you choose as the epoch, it
# won't change the algorithm. Just don't change it after you
# have cached computed scores. Choose something before your first
# post to avoid annoying negative numbers. Choose something close
# to your first post to keep the numbers smaller. This is, I think,
# reddit's own epoch.
$our_epoch = Time.local(2005, 12, 8, 7, 46, 43).to_time
def epoch_seconds(t)
(t.to_i - $our_epoch.to_i).to_f
# date is a ruby Time
def hot(ups, downs, date)
s = ups - downs
displacement = Math.log( [s.abs, 1].max, 10 )
sign = if s > 0
elsif s < 0
return (displacement * sign.to_f) + ( epoch_seconds(date) / 45000 )

This comment has been minimized.

Sign up for free to join this conversation on GitHub. Already have an account? Sign in to comment
You can’t perform that action at this time.