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Learning Programming with Erlangor Learning Erlang with Ladybirds

Frank Huch

Christian-Albrechts-University of Kiel

15. Oktober 2007

Frank Huch (CAU Kiel) Learning Erlang 15. Oktober 2007 1 / 18

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Learning Erlang with Ladybirds

Frank Huch (CAU Kiel) Learning Erlang 15. Oktober 2007 2 / 18

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Computer Science in Germany

students in computer science in Germany (also Kiel):less than 20% girlscomputer science not taught in every school

Our approach for improvement:One week course introducing computer scienceTalks of research groups, information about studyingcomputer science, discussion with students and femalecomputer scientist from industry, a trip to an IT company, anda programming course with a final project.

Frank Huch (CAU Kiel) Learning Erlang 15. Oktober 2007 3 / 18

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Teaching Programming

Excercises in a nice programming environmentZurich: Programming environment KaraSolve tasks by programming a little ladybird

Advantages: Attractive task, good identification

Programming with: Finite Automata, JavaOur approach: Erlang

Frank Huch (CAU Kiel) Learning Erlang 15. Oktober 2007 4 / 18

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Teaching Programming

Excercises in a nice programming environmentZurich: Programming environment KaraSolve tasks by programming a little ladybird

Advantages: Attractive task, good identification

Programming with: Finite Automata, JavaOur approach: Erlang

Frank Huch (CAU Kiel) Learning Erlang 15. Oktober 2007 4 / 18

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Teaching Programming

Excercises in a nice programming environmentZurich: Programming environment KaraSolve tasks by programming a little ladybirdAdvantages: Attractive task, good identification

Programming with: Finite Automata, JavaOur approach: Erlang

Frank Huch (CAU Kiel) Learning Erlang 15. Oktober 2007 4 / 18

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Teaching Programming

Excercises in a nice programming environmentZurich: Programming environment KaraSolve tasks by programming a little ladybirdAdvantages: Attractive task, good identification

Programming with: Finite Automata, JavaOur approach: Erlang

Frank Huch (CAU Kiel) Learning Erlang 15. Oktober 2007 4 / 18

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Teaching Programming

Excercises in a nice programming environmentZurich: Programming environment KaraSolve tasks by programming a little ladybirdAdvantages: Attractive task, good identification

Programming with: Finite Automata, JavaOur approach: Erlang

Frank Huch (CAU Kiel) Learning Erlang 15. Oktober 2007 4 / 18

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Lessons

basics: sequences, simple commands, case, recursionparameters (variables, integers, booleans)data structures (tuples, lists)modules, concurrency, distributionproject: design and implementation of chat

Frank Huch (CAU Kiel) Learning Erlang 15. Oktober 2007 5 / 18

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Basic Language

Prg ::= Rule Prg| Rule

Rule ::= Func() -> Cmds .Cmds ::= Cmd , Cmds

| CmdCmd ::= go() | take() | mark() | nothing()

| turn(Dir) | Func()| case Dir() of

Pat1 -> e1;. . .

Patn -> enend

Dir ::= left | rigth | frontPat ::= free | shamrock | agaric | tree | border

| _Func ::= [a− z] [a− z,A− Z,0− 9]∗

Frank Huch (CAU Kiel) Learning Erlang 15. Oktober 2007 6 / 18

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Excercises 1

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Excercises 2

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Excercises 3

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Excercises 4

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Non-Tail Recursion

start() -> case front() ofshamrock -> go(), take(),

start(),mark(), go();

_ -> go()end.

Recursion is not difficult.

Recursion is cool!

Frank Huch (CAU Kiel) Learning Erlang 15. Oktober 2007 11 / 18

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Non-Tail Recursion

start() -> case front() ofshamrock -> go(), take(),

start(),mark(), go();

_ -> go()end.

Recursion is not difficult.

Recursion is cool!

Frank Huch (CAU Kiel) Learning Erlang 15. Oktober 2007 11 / 18

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Excercises 5

Frank Huch (CAU Kiel) Learning Erlang 15. Oktober 2007 12 / 18

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Excercises 5

Frank Huch (CAU Kiel) Learning Erlang 15. Oktober 2007 12 / 18

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Excercises 5

Frank Huch (CAU Kiel) Learning Erlang 15. Oktober 2007 12 / 18

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Excercises 5

Frank Huch (CAU Kiel) Learning Erlang 15. Oktober 2007 12 / 18

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Lessons

basics: sequences, simple commands, case, recursionparameters (variables, integers, booleans)data structures (tuples, lists)modules, concurrency, distributionproject: design and implementation of chat

Frank Huch (CAU Kiel) Learning Erlang 15. Oktober 2007 13 / 18

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Excercises 7

Frank Huch (CAU Kiel) Learning Erlang 15. Oktober 2007 14 / 18

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Lessons

basics: sequences, simple commands, case, recursionparameters (variables, integers, booleans)data structures (tuples, lists)modules, concurrency, distributionproject: design and implementation of chat

Frank Huch (CAU Kiel) Learning Erlang 15. Oktober 2007 15 / 18

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Excercises 7

Frank Huch (CAU Kiel) Learning Erlang 15. Oktober 2007 16 / 18

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Lessons

basics: sequences, simple commands, case, recursionparameters (variables, integers, booleans)data structures (tuples, lists)modules, concurrency, distributionproject: design and implementation of chat

Frank Huch (CAU Kiel) Learning Erlang 15. Oktober 2007 17 / 18

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Opportunities of Using Erlang in Our Approach

only one programming languagesimple syntaxno confusing typesabstraction (reuse of function definitions)only recursionavailability of Erlang

Problems:error messagesold-fashioned GUI

Frank Huch (CAU Kiel) Learning Erlang 15. Oktober 2007 18 / 18