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Typeclasses, Monads, etc. Functional programming in Scala can be simple!
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“The plan” • Implicit parameters - readability
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“The plan” • Implicit parameters - readability • Typeclasses - code reuse
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“The plan” • Implicit parameters - readability • Typeclasses - code reuse • Monads - composition
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Implicit Parameters Demo
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• Keyspace =~ db schema • Column family =~ db table
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Operations on rows
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Operations on objects
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Typeclasses Demo
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What is type class? Type class == Group of types
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What is type class? Type class == Group of types
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What is type class? Type class == Group of types T belongs to CassandraObject typeclass if there is class X such that X extends CassandraObject[T]
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Type class instance
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Serialization
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Typecalass
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Typeclass Instance
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Multiple Instances
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Numeric
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Matrix multiplication
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Matrix multiplication
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Typeclasses summary
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Typeclasses summary
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Typeclasses summary
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Typeclasses summary Numeric[T] Serializable[T]
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JVM Cassandra Actor Router Actor Cassandra Actor Connection Cassandra Get(...) Cassandra Actor Connection
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JVM Cassandra Actor Router Actor Cassandra Actor Connection Cassandra Get(...) Cassandra Actor Connection
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JVM Cassandra Actor Router Actor Cassandra Actor Connection Cassandra Get(...)
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JVM Cassandra Actor Router Actor Cassandra Actor Connection Cassandra Get(...) Cassandra Actor Connection
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Async Action
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Save as Async
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Composition
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Composition Demo
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Monad Monad laws:
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Functor
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Functor Monad is a Functor:
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For comprehension
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For comprehension ==
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For comprehension ==
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Option is a Monad
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Future is a Monad
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Collections are Monads
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Option -> Iterable
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Questions? Peter Gabryanczyk @piotrga
[email protected]
http://blog.scala4java.com