Questions set as resource to learn programming futures, promises and actors

I found the "99 Scala Problems" very useful to learn Scala Collections and Data Structures. Is there some question bank similar to that which I could use to sharpen my futures/promises skills (and scala specifically, the actors )? Though I am trying to learn Scala, such a problem-and-program resource in other other languages (Java, Haskell, JavaScript) will be also welcome... even a book for that matter...

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Here is a great resource for java.

http://practiceit.cs.washington.edu/

链接地址: http://www.djcxy.com/p/55428.html

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