User:Dirk
| Language | Proficiency | When | Comments |
|---|---|---|---|
| 6502 Assembly | Advanced | From about 1984 to 1987 | C64 era |
| Ada | Beginner | About 2010 | Some example code |
| AWK | Advanced | Since about 1994 | Using it occasionally |
| Bash | Advanced | Since 1994 | Using it on a daily basis |
| C | Advanced | From about 1987 to 2007 | |
| C++ | Expert | Since about 1993 | On a daily basis, mostly C++14 today |
| Commodore BASIC | Advanced | From about 1983 to 1987 | C64 era |
| Emacs Lisp | Advanced | Since about 1993 | Mostly C++14 today |
| Haskell | Beginner | Since about 2010 | Experimenting with it now and then |
| Java | Beginner | Since about 2014 | Using Java as example language in my unit-testing lectures |
| LaTeX | Intermediate | Since about 1993 | |
| Lua | Beginner | About 2023 | |
| Make | Intermediate | Since about 1993 | |
| Modula-2 | Intermediate | 1989-1991 | Was taught as first language during my Computer Science studies |
| Pascal | Beginner | 1986-1988 | School courses (which I partly supported) |
| Prolog | Beginner | Since 2014 | Experimenting with it now and then |
| Python | Advanced | Since before 2000 | |
| Scheme | Intermediate | From about 1996 to 2001 | Still using it now and then |
| Sed | Intermediate | Since about 1993 | Using it seldomly |
| Smalltalk | Intermediate | 1991 | Used for programming project at university |
| SQL | Beginner | Since 2010 | Experimenting with it now and then |