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} } When the above code is compiled and executed, it produces the following result: C:/>scalac Test.scala C:/>scala Test false true true C:/> When to use traits? There is no firm rule, but here are few guidelines to consider: If the behavior will not be reused, then make it a concrete class. It is not reusable behavior after all. If it might be reused in multiple, unrelated classes, make it a trait. Only traits can be mixed into different parts of the class hierarchy. If you want to inherit from it in Java code, use an abstract class. If you plan to distribute it in compiled form, and you expect outside groups to write classes inheriting from it, you might lean towards using an abstract class. If efficiency is very important, lean towards using a class. TUTORIALS POINT Simply Easy Learning
CHAPTER 17 Scala Pattern Matching Pattern matching is the second most widely used feature of Scala, after function values and closures. Scala provides great support for pattern matching for processing the messages. A pattern match includes a sequence of alternatives, each starting with the keyword case. Each alternative includes a pattern and one or more expressions, which will be evaluated if the pattern matches. An arrow symbol => separates the pattern from the expressions. Here is a small example, which shows how to match against an integer value: object Test { def main(args: Array[String]) { println(matchTest(3)) } } def matchTest(x: Int): String = x match { case 1 => "one" case 2 => "two" case _ => "many" } When the above code is compiled and executed, it produces the following result: C:/>scalac Test.scala C:/>scala Test many C:/> The block with the case statements defines a function, which maps integers to strings. The match keyword provides a convenient way of applying a function (like the pattern matching function above) to an object. Following is a second example, which matches a value against patterns of different types: object Test { def main(args: Array[String]) { println(matchTest("two")) println(matchTest("test")) println(matchTest(1)) } def matchTest(x: Any): Any = x match { case 1 => "one" TUTORIALS POINT Simply Easy Learning
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Scala Tutorial
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ABOUT THE TUTORIAL Scala Tutorial S
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FLOATING POINT LITERALS ...........
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Scala Strings .....................
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CHAPTER 1 Scala Overview Scala, sho
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CHAPTER 2 Scala Environment Setup T
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$scala -version Scala code runner v
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} * This will print 'Hello World' a
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forSome If implicit import Lazy Mat
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CHAPTER 4 Scala Data Types Scala ha
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Characters must not necessarily be
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Variable Type Inference: When you a
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The access to f in class Sub is OK
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var a = 10; var b = 20; var c = 25;
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} } println("a && b = " + (a&&b) );
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a >>> 15 C:/> Assignment Operators:
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Here, operators with the highest pr
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} If the boolean expression evaluat
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Nested if...else Statement: It is a
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while loop do...while loop for loop
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Flow Diagram: Example: object Test
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When the above code is compiled and
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} } // for loop execution with mult
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Flow Diagram: Example: import scala
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Infinite Loop: A loop becomes infin
Page 51 and 52: } } return sum A function, which do
Page 53 and 54: When the above code is compiled and
Page 55 and 56: } When the above code is compiled a
Page 57 and 58: } logWithDateBound("message1" ) log
Page 59 and 60: CHAPTER 12 Scala Strings Consider t
Page 61 and 62: } } var str2 = "Tod"; println("Dot
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Page 65 and 66: CHAPTER 13 Scala Arrays Scala provi
Page 67 and 68: C:/> Multi-Dimensional Arrays: Ther
Page 69 and 70: C:/> Scala Arrays Methods: Followin
Page 71 and 72: Scala Lists Scala Lists are quite s
Page 73 and 74: Creating Uniform Lists: You can use
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Page 77 and 78: var s = Set(1,3,5,7) While defining
Page 79 and 80: C:/> Scala Set Methods: Following a
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Page 83 and 84: use two maps with ++ as method colo
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Page 87 and 88: val t = new Tuple3(1, "hello", Cons
Page 89 and 90: The method will return Some[Person]
Page 91 and 92: 6 7 8 9 10 11 12 13 14 def filter(p
Page 93 and 94: Scala Iterator Methods: Following a
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Page 97 and 98: CHAPTER 15 Scala Classes & Objects
Page 99 and 100: } } println ("Point y location : "
Page 101: CHAPTER 16 Scala Traits A trait enc
Page 105 and 106: } // case class, empty one. case cl
Page 107 and 108: } When the above code is compiled a
Page 109 and 110: [0-9] Match any digit; same as [012
Page 111 and 112: CHAPTER 19 Scala Exception Handling
Page 113 and 114: CHAPTER 20 Scala Extractors An extr
Page 115 and 116: CHAPTER 21 Scala Files I/O Scala is
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