good websites to practice scala

https://www.scala-exercises.org/

http://aperiodic.net/phil/scala/s-99/

 

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Coding Practice & Competion Websites

  1. topcoder
    http://www.topcoder.com
    (a great blog: http://petr-mitrichev.blogspot.com/)
  2. hackerrank
    hackerrank.com
  3. leetcode
    leetcode.com
  4. coderbyte
    coderbyte.com
  5. geeksforgeeks
    geeksforgeeks.org
  6. codeforces
    codeforces.com
  7. codewars
    codewars.com
  8. codeeval
    http://www.codeeval.com
  9. spoj
    spoj.com
  10. devdraft
    devdraft.com
  11. codechef
    http://www.codechef.com
  12. projecteuler
    projecteuler.net
  13. hackerearth
    hackerearth.com
  14. checkio
    py.checkio.org
  15. codinggame
    codinggame.com
  16. theaigames
    theaigames.com
  17. programmr
    http://www.programmr.com

 

 

 

Intellij error: usage of api documented as @since…, Usage of API documented as @since 1.6+..

To get rid of the first one, you need to open up

File -> Project Structure -> Project Settings -> Modules -> "Your Module Name" -> Sources -> Language Level

and change that to the desired level i.e 1.8 or the Project Default language level

To fix the second one:

  1. File > Settings > Build, Execution, Deployment > Java Compiler
  2. Change Target bytecode version to 1.8 of the module that you are working for.