WE ARE ALL BLESSED. Bruce Tate

Transcription

1 WE ARE ALL BLESSED Bruce Tate 1

2 DAVE'S STORY 2

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8 ALWAYS LOVED LANGUAGES Algol, APL, APT, Basic, BCP, C, C++, COBOL, Delphi, TECO, TCL, TeX, XSLT 7

9 comp.lang.misc 8

10 BRUCE'S STORY 9

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15 I REALLY LOVED BASIC. 12

16 13

17 MOSTLY PASCAL; C, LISP... 14

18 I LIKED PASCAL. 15

19 16

20 C, C++, JAVA. 17

21 I TOLERATED JAVA. 18

22 SOLO 19

23 LOVE / HATE RELATIONSHIP 20

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25 21 SHUT UP AND DO SOMETHING NONTRIVIAL IN RUBY, AND THEN WE CAN TALK. - Dave Thomas

26 22

27 Pragmatic Bookshelf 23

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29 Pragmatic Bookshelf 24

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32 There is a central quality which is the root criterion of life and spirit in a man, a town, a building, or a wilderness. This quality is objective and precise, but it cannot be named. Christopher Alexander The Timeless Way of Building

33 27 QUALITY WITHOUT A NAME 28

34 QWAN 29

35 QWAN COMPLETENESS 30

36 It seems there is a positive correlation between the simplicity of the rules and the quality of the algebra as a description tool. Peter Henderson

37 31 SOUL 32

38 I KNOW IT WHEN I SEE IT

39 I KNOW IT WHEN I SEE IT Angus L. Macdonald Bridge, Halifax, Nova Scotia, Canada Salim Virji 34

40 I KNOW IT WHEN I SEE IT int sum = 0; for (int i = 0; i < sizeof(arr)/sizeof(arr[0]), i++) { sum += arr[i]; } return sum; list > Enum.reduce(&+/2) 35

41 QWAN IN RUBY 36

42 RUN CODE DURING "COMPILATION" class Dictionary end WORDS = File.readlines("/usr/dict/words") def size WORDS.size end 37

43 METAPROGRAMMING AND DSLS get '/' do "Hello, World!. It's #{Time.now}" end 38

44 METAPROGRAMMING AND DSLS set(:probability) { value condition { rand <= value } } get '/win_a_car', :probability => 0.1 do "You won!" end get '/win_a_car' do "Sorry, you lost." end 39

45 DUCKTYPING AND THE OBJECT MODEL test "'not found' is handled" do mock_server = "xxx" def mock_server.query(*) { status: 404, message: "not found" } end response end assert_equal :not_found, response 40

46 (YOUR AESTHETICS MAY VARY ) 41

47 QWAN IN ELIXIR 42

48 signature = join(sort(to_list(word))))

49 43 signature = word > to_list > sort > join More than a convenience it reflects and reinforces a key facet of functional programming.

50 44 signature = word > to_list > sort > join FUNCTIONS TRANSFORM DATA

51 45 SPEAKING OF FUNCTIONS case File.open("somedata.csv") do {:ok, file} -> process(file) {:error, reason} -> report(reason) end 46

52 SPEAKING OF FUNCTIONS "somedata.csv" > File.open > case({:ok, file} -> process(file) {:error, reason} -> report(reason)) It's all transformations 47

53 defmodule LogWriter do def log(msg) do if Application.get_env(:app, :debug) do IO.puts msg end end end How many reserved words?

54 48 %C %R %S %W %c %r %s %w &&! >.. :: <> ^ CALLER DIR ENV MODULE aliases block alias! alias and binding callback case cond def defdelegate defexception defimpl defmodule defoverridable defp defprotocol defstruct destructure for get_and_update_in if import in is_nil match? or put_in quote raise receive require reraise super to_char_list to_string try unless unquote update_in use var! with 49

55 THE LANGUAGE IS THE LANGUAGE %C %R %S %W %c %r %s %w &&! >.. :: <> ^ CALLER DIR ENV MODULE aliases block alias! alias and binding callback case cond def defdelegate defexception defimpl defmodule defoverridable defp defprotocol defstruct destructure for get_and_update_in if import in is_nil match? or put_in quote raise receive require reraise super to_char_list to_string try unless unquote update_in use var! with 50

56 EMPATHY

57 %%% some name (C) 2013, some name %%% %%% Created : 26 May 2013 by some name me@hostname.local %%% module(). -behaviour(gen_server). %% API -export([start_link/0]). %% gen_server callbacks -export([init/1, handle_call/3, handle_cast/2, handle_info/2, terminate/2, code_change/3]). -define(server,?module). -record(state, {}). %%%=================================================================== %%% API %%%=================================================================== %% %% Starts the server %% start_link() -> {ok, Pid} ignore {error, Error} %% start_link() -> gen_server:start_link({local,?server},?module, [], []). %%%=================================================================== %%% gen_server callbacks %%%=================================================================== %% %% Initializes the server %% init(args) -> {ok, State} 128 lines 22 lines of code

58 55 defmodule MyServer do use GenServer #... end

59 56 defmodule Agent.Server do use GenServer def init(fun) do initial_call(fun) {:ok, run(fun, [])} end def handle_call({:get, fun}, _from, state) do {:reply, run(fun, [state]), state} end def handle_call({:get_and_update, fun}, _from, state) do case run(fun, [state]) do {reply, state} -> {:reply, reply, state} end end other -> {:stop, {:bad_return_value, other}, state}

60 57 THE QWAN GOES ON Testing Protocols Rationalized library APIs Mix Hex exrm People... 58

61 David Merrett. CCA.

62 59 QWAN IS TWO WAY WE ARE INSPIRED IN THE PRESENCE OF QUALITY 60

63 PIPELINES AND PROTOCOLS INSPIRE US TO CODE IN TERMS OF TRANSFORMATIONS 61

64 BEHAVIOURS AND MACROS INSPIRE US TO CODE IN THE DOMAIN, NOT THE IMPLEMENTATION 62

65 GREAT DOCUMENTATION INSPIRES US TO WRITE MORE THAN CODE (WHICH MAKES US THINK ABOUT OUR WORK DIFFERENTLY) 63

66 MODULARITY AND EXRM INSPIRE US TO WRITE TINY APPS AND DEPLOY OFTEN 64

67 GREAT LEADERS INSPIRE US TO EMULATE THEM 65

68 BUT THIS IS DIFFICULT

69 LANGUAGE MAKING IS SEEKING QWAN 67 68

70 LANGUAGE MAKING IS SOMETIMES HARD 69

71 LANGUAGE MAKING IS SOMETIMES MESSY 70

72 HOW TO REACH THE TOP? 71

73 SHERPA SHR - pə A people living on the border of Nepal and Tibet. Sherpas live at a high altitude. They are capable of functioning at a much higher level at the high elevations found on Everest. 72

74 (

75 73 SHERPAS MAKE CAMP 74

76 THE ERLANG TEAM 75

77 JOSÉ'S GREAT DECISION 76

78 (1 of 7 blog)

79 77 SHERPAS TAKE THE HEAVIEST LOADS 78

80 PLUG 79

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82 80 SHERPAS PREPARE THE WAY 81

83 ELIXIR AND ELM 82

84 A DARK HISTORY National Geographic 83

85 WE ARE ALL SHERPAS 84

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96 WHAT YOU DO... WILL AFFECT WHAT THEY WILL DO 95

97 WE CAN SHARE THE LOAD 96

98 NOT BECAUSE WE HAVE TO 97

99 BUT BECAUSE WE ARE BLESSED. 98

100 BUT BECAUSE WE ARE BLESSED! 99