HN Hall of Fame Weekly email

Low Level Bit Hacks You Absolutely Must Know

www.catonmat.net Books & learning Tutorials & guides Computer science Class of 2018-05 Hall of Fame
Screenshot of www.catonmat.net captured 2026-07-20
Page preview · captured 2026-07-20

Resurfaced independently across 4 calendar years, with breakout response in 2 of them.

submissions
5
submitters
5
observed span
2009–2018
peak thread · 171 comments
342 pts
latest 20+ return · 2018-05-10
342 pts

Submission timeline

2007–2026

One slot for every year since HN launched. Height is that year's peak points; orange marks a 100+ point or 50+ comment breakout. Select a bar to open its strongest thread.

First comments on top threads

HN comment order

I was asked #1 "Check if the integer is even or odd" in an interview once. Not worded quite that way but that was the answer they were looking for. 12 years later not a single person I have hired could correctly answer that question[1] and most of them (almost all) have been great productive software developers. So "absolutely must know" is entirely dependent on the type of software you write. [1] I don't ask it in the interview, I…

For those who enjoy these kind of problems I highly recommend "Hacker's delight". http://www.amazon.com/Hackers-Delight-Henry-S-Warren/dp/0201...

The first top-level comment from each of the four biggest threads, in HN’s own order. Excerpts are shortened; open a comment for full context.

Breakout years
2

100+ points or 50+ comments

Total points
499

reference only — not used in Hall rules or ranking

Total comments
247

reference only — not used in Hall rules or ranking

Every submission

DateTitle as submittedByPointsComments
2009-06-30Low Level Bit Hacks You Absolutely Must KnowFirst breakoutpkrumins13976
2012-02-16Low Level Bit Hacks You Absolutely Must Know - good coders code, great reuseColinWright60
2014-01-27Low Level Bit Hacks (2009)aburan28110
2014-10-24Low Level Bit Hacks (2009)rivert10
2018-05-10Low Level Bit Hacks You Absolutely Must KnowHall induction · Best thread · Latest 20+ point returnwheresvic1342171