A Tour Of Scala

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fanf42

A general presentation of the Scala language, a OO/functional, statically typed language that runs on the JVM

Technology

A tour of Scala Francois Armand http://fanf42.blogspot.com June 2009

Background - Martin Odersky history ,[object Object]

On the JVM ,[object Object],[object Object],[object Object]

GJ compiler became the default Javac for Java 1.3 ,[object Object],[object Object]

Pure academic experiment - too academic Genesis

Current version : 2.7.5 – 2.8 before end of 2009 (hopefully) ,[object Object],[object Object]

Object Oriented / Functional Programing real merge Genesis

DSL ,[object Object],Scala is mainstream

Fully compatible with Java ,[object Object]

And the same (almost) holds for the other way ,[object Object]

Performances: on part with Java Scala is mainstream

One people full time on it ,[object Object],[object Object]

Easyly usable, high level data types / control structures

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Coding with style: The Scalastyle style checker Scalastyle is a static code analysis tool that helps programmers write Scala code according to the coding standards their project. It is heavily influenced by Checkstyle, PMD and FindBugs for Java. These tools are used by java developers everywhere, and Scalastyle will help Scala gain more acceptance within companies. Scalastyle can check many aspects of your code. It has as goals: - to check the style of your code according to house style (usage of tabs, correct whitespace usage), - coding conventions (too many parameters to a method, usage of disallowed libraries, usage of return) - and code which exhibits bug patterns (equals and hashCode not implemented in the same class). Currently, scalastyle works as standalone, and there is an Eclipse plugin, and plugins for sbt and maven are planned. In this talk, we discuss why we're creating Scalastyle, what it currently does (the rules that are checked), and how it does it (using the wonderful Scalariform), along with the current state of third part integration (Eclipse, Maven).

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Javascript is awesome, and asynchronous. But some libraries are made by egocentric people : how to contain all DB interaction to the connection callback? Does the Callback soup a fatality? This talk help you to use data structure to keep safe your code. Some great ideas are comming from the functional programing world. How to use it with javascript browser and/or node.js? Is it really complicated? I write this talk because I use node.js a lot and write a lot of fix in my code to abstract database driver (couchbase, mongo, postgre...). I found an effective way to solve problems using functional programing data structure. But this talk is not for nerd or claiming functional programing superiority : some tools are cool, make your code cleanest and modular, so use it !

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A Tour Of Scala

1. A tour of Scala Francois Armand http://fanf42.blogspot.com June 2009

4. A scripting language

5. Object Oriented

6. Functional

7. Scalable

10.

11. Pure academic experiment - too academic Genesis

12.

13. Major rewrite in 2006

14.

15. Object Oriented / Functional Programing real merge Genesis

16.

17. On the JVM

18. Statically typed

19.

20. Business layer

21.

22.

23.

24.

25. Without any glue code / specific syntax

26.

27. Performances: on part with Java Scala is mainstream

28.

29. Type annotation AFTER names

30. With generics and type boundaries

31. With type inference Scala is mainstream

32.

33.

34.

35. Free licences Scala is mainstream

36.

37. Terse / expressive

38. Duck typing

39. Add methods to existing class

40. Easyly usable, high level data types / control structures

41.

42.

43. Function definition

44. condition

45.

46.

47. “ .”

48. “ ;”

49. { } for one-line method

50. “ ( )” when 0 or one argument

51.

52.

53. For comprehension Scala is a scripting language

54.

55.

56.

57.

58.

59. Executed in a console: ~$ ./helloWorld.scala Scala is a scripting language

60.

61. With Classes and Objects

62. Traits

63.

64.

65.

66.

67.

68. Singleton object Scala is a object oriented

69. Compared to Java Scala is a object oriented

70.

71. Add aspects Scala is a object oriented

72.

73.

74. Higher order functions

75. Immutability & consistency

76. Pattern matching

77. Functional data structures

78. Currying

79. Lazy constructs

80. And a lot of other things !

81.

82. Block in function parameters Scala is functional

83.

84. Closure = parameters and properties Scala is functional

85.

86.

87. + Higher order functions & closures

88. + optional syntax

89.

90.

91.

92.

93. Two many methods needed to have them in a top-level object

94. When methods (or top-level object) not under your control Scala is a functional

95.

96. Automatically add equals/hashcode and Factories for you

97. “sealed” => compiler checks that all choices are tested Scala is a functional

98.

99. == function with multiple argument lists

100.

101.

102.

103.

104. Abstract type

105. Existential types

106. Type variance

107. Monads

108. Combinatory parsers

109. And a lot more

110.

111.

112.

113. New Control Structures

114.

115. DSL: Actors Scalable language

116. DSL: XML Scala is a functional

117.

118. 4 books (and 2 other by the end of 2009)

119. Active mailing list / irc channel

120.

121.

122.

123. Named and default parameters

124. Package object

125. Scala Swing library

126. Revamped REPL

127. Type specialization

128. Continuation (as a plugin compiler) Last words

129.

130. http://www.artima.com

A Tour Of Scala

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