Well, Phil Karlton said that "There are only two hard things in Computer Science...

randlet · on May 4, 2013

I think the joke is: "There are only two hard things in Computer Science; cache invalidation, naming things and off by one errors".

gizmo686 · on May 4, 2013

Whats the joke? The hard things are:

0) cache invalidation

1) naming things

2) off by one errors

Looks like he counted right to me.

EDIT: fixed newlines

oneeyedpigeon · on May 5, 2013

[ "cache invalidation", "naming things", "off by one errors"].length != 2