Tales from the Workshops

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1 Tales from the Workshops Dr Russel Winder Web: 1

2 Agile is the new black. 2

3 Aims, goals, objectives 3

4 Aims, goals, objectives Explore some experiences teaching new programming languages to programmers. Try and find some signposts to PPIG type things. 4

5 Agile is passé? 5

6 Structure Beginning Middle End 6

7 Personal Path FORTRAN Assembly language Algol-68 Pascal C Prolog Modula-2 Scheme Java C++ Python Miranda Clean Java Fortran Haskell Fortress X10 Chapel C# Clojure Groovy D Scala Go Ceylon Kotlin Rust Frege 7

8 The University Years 8

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10 Dungeons and Dragons AD&D obviously, not D&D. Student projects often in C, not a good language for writing these games and tools. Pascal past its use by date. Lisp might have been useful. 10

11 MMORPG MUD, and the like Game description languages Domain Specific Language (DSLs) especially internal rather than external. It's all about abstraction, tokens, and programming activity. 11

12 e.g. Python For: Bounded iteration While: Unbounded iteration Functions: Activity token Classes: Object factory. It's all about abstraction, tokens, and programming activity. 12

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14 BCS HCI SG Humans as part of systems. Creating good Uis, with good UX. Software development tools and the coming of IDEs. As opposed to UNIX philosophy of OS, shell, and tools. 14

15 Undergraduates Polyglot approach: Scheme then C++ Miranda then C++ Monoculture: Java Wot no Python? The role of REPLs. 15

16 Postgraduates Mentor do not supervise. Philosophy matters. Computational models, operational semantics, and declarative semantics are critical. 16

17 A Language War Functional Vs. Object-oriented 17

18 The Start-up Years 18

19 Languages Realizing a novel low-level machine. C, (C++), Java. Python for driving integration and system tests of the C codes. 19

20 Mentor not Manage Self-directing teams. Best thinkers/software designers not always the best programmers. Agile before Agile. 20

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22 The Last 10 Years 22

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25 The Workshops Introducing a programming language to programmers used to other programming languages. Taking programmers who sort of know a programming language much further into that programming language. 25

26 Introduction to topic with relevant examples. Pair working on some related problems. Mob working or leader led live coding. 26

27 Adults do not feel playing with things is right. feel they have to construct without error rather than try and (fail succeed). worry they should not have fun. Happy, smiling people tend to learn more? 27

28 Problems small enough to be completed; or small changes in a big code base. Development vs. Maintenance. 28

29 Programmers cannot seem to do as much as they think they can in 40mins. seem not to know as much as they (think should). 29

30 Pairing can be hard to get programmers to do. increases the energy in workshops. leads to more fun, and less stress about getting things wrong. Happy, smiling people tend to learn more? 30

31 Feedback is crucial to learning. must be integral to workshop structure, both individual and group. 31

32 Introduction to topic with relevant examples. Pair working on some related problems. Mob working or leader led live coding. 32

33 A Language War Statically typed Vs. Dynamically typed 33

34 Static languages compiler support for type checking. compiler generated, ahead of time optimized code. strong IDE support. 34

35 Dynamic Languages interpreted or bytecode compiled. slower (but ). hard for IDE to give excellent support. generally use duck typing. 35

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44 Dynamic Objects An object has no defined for all runtime interface. An object's interface can only be determed at run time, and may change immediately after being checked. 44

45 Duck Typing If an object has a particular method at the moment of being asked to execute that method, then the object must be of the right type. 45

46 The Points some programmers, used to statically typed languages, cannot cope with dynamically types ones. IDEs have a hard time giving programmers the support expected from the statically type language experience. 46

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48 What is the value of π? 48

49 It's simples. Александр Орлов

50 Programmers generally do not know as much about floating point hardware as they (think should). 50

51 Programmers generally know less about concurrency and parallelism that they (think should). 51

52 IDEs make development much easier for some. definitely work better with static languages. appear to be enforcing static typing. 52

53 Python Even the doyen of dynamic languages is investigating type hinting, cf. PEP 484 and MyPy. 53

54 Groovy is an optionally typed language. Can use it fully dynamic or with run time checked types. Or with annotations, as a statically type checked, and even compiled, language. 54

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57 Tales from the Workshops Dr Russel Winder Web: 57

Static Typing or Dynamic Typing: A Real Issue or a Simple Case of Tribalism

Static Typing or Dynamic Typing: A Real Issue or a Simple Case of Tribalism Dr Russel Winder Concertant LLP russel.winder@concertant.com 2007 Russel Winder 1 Aims and Objectives Survey some of the static