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  1. object Main extends App {
  2. def printArray[K](array:Array[K]) = array.mkString("Array(" , ", " , ")")  
  3.  
  4. //Mutable array of type Array[Int]  
  5. val array1 = Array(1, 2, 3)   //>array1 = [I@6ae01647  
  6. printArray(array1)//>Array(1, 2, 3)  
  7. //Mutable array of type Array[Any]  
  8. val array2 = Array("a", 2, true)   //>array2 = [Ljava.lang.Object;@1dd6c622  
  9. printArray(array2)//>Array(a, 2, true)  
  10. //Mutable array of type Array[String]  
  11. val array3 = Array("a", "b", "c")   //>array3 = [Ljava.lang.String;@7f69f17b  
  12. printArray(array3)  //>Array(a, b, c)  
  13. //Access items using (index) not [index]    
  14. val itemAtIndex0 = array3(0)   //>itemAtIndex0 = a  
  15.  
  16. //Modify items the same way    
  17. array3(0) = "d"    
  18. printArray(array3)  //>Array(d, b, c)  
  19.  
  20. //Concatenation using the ++ operator,   
  21. //Prepending items using +: and appending using :+    
  22. val concatenated = "prepend" +: (array1 ++ array2) :+ "append"  //>concatenated = [Ljava.lang.Object;@46d0397  
  23. printArray(concatenated)  //>Array(prepend, 1, 2, 3, a, 2, true, append)  
  24.  
  25. //Finding an index of an item    
  26. array3.indexOf("b") //>1  
  27.  
  28. //Diff    
  29. val diffArray = Array(1,2,3,4).diff(Array(2,3))  //>diffArray = [I@1106b0c6  
  30. printArray(diffArray) //>Array(1, 4)  
  31.  
  32. //Find (stops when item is found)    
  33. val personArray = Array(("Alice",1), ("Bob",2), ("Carol",3))  //>personArray = [Lscala.Tuple2;@4e3f9fe5  
  34. def findByName(name:String) = personArray.find(_._1 == name).getOrElse(("David",4))  //>findByName(name = "foo") => (David,4)  
  35. val findBob = findByName("Bob")  //>findBob = (Bob,2)  
  36. val findEli = findByName("Eli")  //>findEli = (David,4)  
  37.  
  38. val bobFound = findBob._2  //>bobFound = 2  
  39. val eliFound = findEli._2  //>eliFound = 4  
  40.  
  41. }
Success #stdin #stdout 0.42s 382080KB
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https://ideone.com/AlgGra
language:
Scala (scala 2.12.8)
created:
9 years ago
visibility:
public

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