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USVladimir Matveev
 

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  1. USVladimir Matveev
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    1. POGiving a value to Provider in guice
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    2. PO
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    3. POJetty + Guice + Jersey gives 404 on accessing the resource
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    2. PO
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      1. POServlet 3.0 annotations in conjuction with Guice
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    2. VO
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      1. POhow to listen to N channels? (dynamic select statement)
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      1. PORetrieve type parameter in pattern matching in scala
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    1. COClojure compiler is able to extract some information about types from the source code. It is possible to write completely dynamic system using reflection everywhere, but the code produced by such compiler will be very slow. Clojure does a good job in finding expression types, and you can use type hints to direct it if needed, but it is impossible to make Clojure use strong type system without turning it into completely different language.
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      1. POWhy is Scala's Type system not a Library in Clojure
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    2. COOTOH, weak type systems like in Python usually do not provide any information about expressions. The exact type of the expression become known only when this expression is evaluated. Such systems are much more easier to implement and program with, but they do not have strong guarantees, and the languages based on such systems are subjects to runtime errors, when some operation is applied to a value of incompatible type.
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      1. POWhy is Scala's Type system not a Library in Clojure
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    3. COBy "strength" of the type system I understand the amount of metainformation about variables and expressions which compiler is able to get. In those type systems which are formal theories, like System F or even Calculus of Constructions (Agda2, Coq), the guarantees about types are so strong that it is possible to prove that the value of given expression will always be in the boundaries of statically known range. This essentially eliminates all but the logical errors, and even some logical errors too, given that the program typechecks and compiles.
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      1. POWhy is Scala's Type system not a Library in Clojure
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