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Scala Language Intro - Inspired by the Love Game

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Antony Stubbs
Antony Stubbs

The document discusses Scala code for implementing a "Love Game" algorithm to calculate compatibility between names in a concise, functional way. It shows the Java implementation using loops and arrays, then demonstrates translating it to 4 lines of Scala code using functional techniques like map, zip and pattern matching. It provides background on Scala's features that enable this brevity and discusses recursion in the functional implementation.

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A brief Scala introduction… Or – LoveGame in 4 lines of code… Move over Java, here comes Scala…
Some questions… ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]
Quick love game run through ,[object Object],[object Object],[object Object]
The Love Game ,[object Object],[object Object]
Java - LoveGame ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]
Java – LoveGame 2 ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]
Scala - LoveGame ,[object Object],[object Object],[object Object],var loves = "loves" . toList map ( x => "roger federer maria sharapova" . toList count ( x == _ )) while (loves . length > 1) loves = loves zip ( loves tail ) map { x => x . _1 + x . _2 } println ( "3 line compatibility = " + loves . head * 2 + " %" )
History ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]
Woah. (Scala Features) ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]
Woah. (Scala Features) ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]
Woah. (Scala Features) ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]
Recursive version ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]
Line by line… The Map Function and Higher-Order Functions ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]
Method Signatures ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]
Recall – Java Case statements ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]
Recall – Java Case statements ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]
Pattern Matching in Scala – Java case statements on steroids ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]
Case statements in Scala ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]
Pattern matching ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]
Recursion in Functional Scala ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]
Our reduce function ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]
Recursion in Functional Scala ,[object Object],[object Object],[object Object]
Putting it all together -> Recursion ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]
Java - LoveGame ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]
Scala - LoveGame ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]
For the cynics out there… smaller Java implementation ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]
And for the side ball…. ,[object Object],[object Object],[object Object],[object Object],[object Object]
More Scala to come… ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]
More Scala to come… ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]
Combinator Parsing ,[object Object],[object Object],[object Object],[object Object],[object Object]
Combinator Parsing ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]
Combinator Parsing ,[object Object],[object Object],[object Object]
Combinator Parsing ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]
Properties / Class Parameters ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]
Implicit Conversions (and mixins with traits) ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]
Working with XML with language level support ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]
Working with XML with language level support ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]
Working with XML with language level support ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]
Actors and Concurrency ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]
Companion objects and Static ,[object Object],[object Object],[object Object],[object Object],[object Object]
More and more and more…. ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]
More Technologies are out there! ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]
The Full Article ,[object Object],[object Object],[object Object],[object Object],[object Object]

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Scala Language Intro - Inspired by the Love Game

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  • 36.
  • 37.
  • 38.
  • 39.
  • 40.
  • 41.
  • 42.
  • 43.