scala-exercises | The easy way to learn Scala | Functional Programming library

 by   scala-exercises Scala Version: v2-mvp License: Apache-2.0

kandi X-RAY | scala-exercises Summary

kandi X-RAY | scala-exercises Summary

scala-exercises is a Scala library typically used in Programming Style, Functional Programming applications. scala-exercises has no bugs, it has no vulnerabilities, it has a Permissive License and it has medium support. You can download it from GitHub.

The easy way to learn Scala.
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              scala-exercises has a medium active ecosystem.
              It has 2583 star(s) with 557 fork(s). There are 118 watchers for this library.
              OutlinedDot
              It had no major release in the last 6 months.
              There are 46 open issues and 240 have been closed. On average issues are closed in 223 days. There are 22 open pull requests and 0 closed requests.
              It has a neutral sentiment in the developer community.
              The latest version of scala-exercises is v2-mvp

            kandi-Quality Quality

              scala-exercises has 0 bugs and 0 code smells.

            kandi-Security Security

              scala-exercises has no vulnerabilities reported, and its dependent libraries have no vulnerabilities reported.
              scala-exercises code analysis shows 0 unresolved vulnerabilities.
              There are 0 security hotspots that need review.

            kandi-License License

              scala-exercises is licensed under the Apache-2.0 License. This license is Permissive.
              Permissive licenses have the least restrictions, and you can use them in most projects.

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              scala-exercises releases are not available. You will need to build from source code and install.
              Installation instructions are not available. Examples and code snippets are available.

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            scala-exercises Key Features

            No Key Features are available at this moment for scala-exercises.

            scala-exercises Examples and Code Snippets

            No Code Snippets are available at this moment for scala-exercises.

            Community Discussions

            QUESTION

            indexOf second argument in Scala
            Asked 2021-Dec-01 at 12:16

            I want to understand what does second argument in indexOf in Scala mean for Strings?

            ...

            ANSWER

            Answered 2021-Dec-01 at 10:45

            According to Scala String documentation, the second parameter is the index to start searching from:

            Source https://stackoverflow.com/questions/70182633

            QUESTION

            Performance of the tail recursive functions
            Asked 2021-Oct-25 at 21:49

            The variety of books, articles, blog posts suggests that rewriting recursive function into tail recursive function makes it faster. No doubts it is faster for trivial cases like generating Fibonacci numbers or calculating factorial. In such cases there is a typical approach to rewrite - by using "helper function" and additional parameter for intermediate results.

            TAIL RECURSION is the great description of the differences between tail recursive and not tail recursive functions and the possible way how to turn the recursive function into a tail recursive one. What is important for such rewriting - the number of function calls is the same (before/after rewriting), the difference comes from the way how those calls are optimized for tail recursion.

            Nevertheless, it is not always possible to convert the function into tail recursive one with such an easy trick. I would categorize such cases as below

            1. Function still can be rewritten into tail recursive but that might require additional data structures and more substantial changes in the implementation
            2. Function cannot be rewritten into tail recursive with any means but recursion still can be avoided by using loops and imitating stack (I'm not 100% sure that tail recursion is impossible in some cases and I cannot describe how identify such cases, so if there is any academical research on this subject - the link would be highly appreciated)

            Now let me consider specific example when function can be rewritten into tail recursive by using additional structures and changing the way algorithm works.

            Sample task: Print all sequences of length n containing 1 and 0 and which do not have adjacent 1s.

            Obvious implementation which comes to mind first is below (on each step, if current value is 0 then we generate two sequences with length n-1 otherwise we generate only sequence with length n-1 which starts from 0)

            ...

            ANSWER

            Answered 2021-Oct-22 at 11:07

            The class of functions in 1 is empty: any computable function written in a recursive style has a tail-recursive equivalent (at the limit, since there's a tail-recursive implementation of a Turing Machine, you can translate any computable function into a Turing Machine definition and then the tail recursive version of that function is running that definition through the tail-recursive implementation of a Turing Machine).

            There are likewise no functions for which tail recursion is intrinsically less efficient than non-tail recursion. In your example, for instance, it's simply not correct that "it's much more efficient in terms of memory because no additional data structures of intermediate results are required." The required additional structure of intermediate results is implicit in the call-stack (which goes away in the tail recursive version). While the call stack is likely an array (more space efficient than a linked-list) it also, because of its generality, stores more data than is required.

            Source https://stackoverflow.com/questions/69664154

            QUESTION

            scala cats traverse for list
            Asked 2020-Nov-11 at 13:57

            I am trying to understand the traverse for list using this page, https://www.scala-exercises.org/cats/traverse

            and I have a very basic question (sorry for those who think it is too easy or obvious). just check below signature

            ...

            ANSWER

            Answered 2020-Nov-11 at 13:57

            Because if you have (n+1)-parameter method foo

            Source https://stackoverflow.com/questions/64787086

            QUESTION

            Scala: Cannot find an implicit value for ContextShift[cats.effect.IO]
            Asked 2020-Feb-14 at 14:41

            I just started with scala and want to build a connection to my DB.

            (My knowledge stems from the scala/doobie Tutorial's on https://www.scala-exercises.org/)

            Now here is the Code:

            ...

            ANSWER

            Answered 2020-Feb-14 at 14:21

            The problem that compiler cant find ContextShift[IO] instance in implicit scope, which is required for some of methods (not sure which exactly). You need to declare your own in implicit scope, like

            Source https://stackoverflow.com/questions/60227855

            Community Discussions, Code Snippets contain sources that include Stack Exchange Network

            Vulnerabilities

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            Install scala-exercises

            You can download it from GitHub.

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