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Scala Higher-Order Functions ....................................................................................................................... 82 Anonymous Functions ......................................................................................................................... 83 Currying Functions ............................................................................................................................... 84 12. SCALA – CLOSURES .......................................................................................................... 86 13. SCALA – STRINGS ............................................................................................................. 88 Creating a String .................................................................................................................................. 88 String Length ....................................................................................................................................... 89 Concatenating Strings .......................................................................................................................... 89 Creating Format Strings ....................................................................................................................... 90 String Interpolation ............................................................................................................................. 91 The ‘f’ Interpolator .............................................................................................................................. 92 String Methods .................................................................................................................................... 94 14. SCALA – ARRAYS ............................................................................................................... 98 Declaring Array Variables .................................................................................................................... 98 Processing Arrays ................................................................................................................................ 99 Multi-Dimensional Arrays .................................................................................................................. 100 Concatenate Arrays ........................................................................................................................... 102 Create Array with Range .................................................................................................................... 103 Scala Array Methods ......................................................................................................................... 104 15. SCALA – COLLECTIONS ................................................................................................... 106 Scala Lists .......................................................................................................................................... 106 Creating Uniform Lists ....................................................................................................................... 109 Tabulating a Function ........................................................................................................................ 110 Scala List Methods ............................................................................................................................. 111 Scala Sets ........................................................................................................................................... 114 v
Scala Basic Operations on set ..................................................................................................................... 115 Find max, min elements in set ........................................................................................................... 117 Find Common Values Insets ............................................................................................................... 118 Scala Map [K, V] ................................................................................................................................ 122 Concatenating Maps .......................................................................................................................... 124 Print Keys and Values from a Map ..................................................................................................... 125 Check for a key in Map ...................................................................................................................... 126 Scala Map Methods ........................................................................................................................... 127 Scala Tuples ....................................................................................................................................... 131 Iterate over the Tuple ........................................................................................................................ 132 Converting to String ........................................................................................................................... 133 Scala Options ..................................................................................................................................... 134 Using getOrElse() Method ................................................................................................................. 136 Using isEmpty() Method .................................................................................................................... 137 Scala Option Methods ....................................................................................................................... 137 Scala Iterators ................................................................................................................................... 139 Find Min & Max values Element ........................................................................................................ 140 Find the length of the Iterator ........................................................................................................... 140 Scala Iterator Methods ...................................................................................................................... 141 16. SCALA – TRAITS .............................................................................................................. 146 Value classes and Universal traits ...................................................................................................... 148 When to Use Traits? .......................................................................................................................... 148 17. SCALA – PATTERN MATCHING ........................................................................................ 150 Matching using case Classes .............................................................................................................. 151 18. SCALA – REGULAR EXPRESSIONNS ................................................................................. 154 Forming Regular Expressions ............................................................................................................. 156 vi
Page 2 and 3: Scala About the Tutorial Scala is a
Page 4 and 5: Scala 4. SCALA - DATA .............
Page 8 and 9: Scala Regular-Expression Examples .
Page 10 and 11: Scala Scala can Execute Java Code S
Page 12 and 13: Scala We assume that the readers of
Page 14 and 15: Scala Windows \>scala -version Scal
Page 16 and 17: Scala Welcome to Scala version 2.9.
Page 18 and 19: Scala $salary, 123abc, -salary Oper
Page 20 and 21: Scala Newline Characters Scala is a
Page 22 and 23: 4. SCALA - DATA Scala Scala has all
Page 24 and 25: Scala "Hello,\nWorld!" "This string
Page 26 and 27: 5. SCALA - VARIABLES Scala Variable
Page 28 and 29: Scala } Save the above program in D
Page 30 and 31: Methods Variables 6. SCALA - CLASSE
Page 32 and 33: Scala } Save the above program in D
Page 34 and 35: Scala \>scala Demo Output Point x l
Page 36 and 37: Scala Implicit classes may not be
Page 38 and 39: 7. SCALA - ACCESS MODIFIERS Scala T
Page 40 and 41: Scala } Scope of Protection Access
Page 42 and 43: 8. SCALA - OPERATORS Scala An opera
Page 44 and 45: Scala == (Equal) 1 Checks if the va
Page 46 and 47: Scala It is called Logical AND oper
Page 48 and 49: Scala Ex: (A & B) will give 12, whi
Page 50 and 51: Scala \>scala Demo Output: a & b =
Page 52 and 53: Scala Try the following example pro
Page 54 and 55: Scala c &= a = 0 c ^= a = 10 c |= a
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9. SCALA - IF ELSE STATEMENT Scala
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Scala if(Boolean_expression){ //Exe
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Scala }else if( x == 30 ){ println(
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10. SCALA - LOOP STATEMENTS Scala T
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Scala while(condition) { Conditiona
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Scala jumps back up to do, and the
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Scala object Demo { } def main(args
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Scala } } Save the above program in
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Scala Scala's for loop allows to fi
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Scala \>scalac Demo.scala \>scala D
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Scala object Demo { def main(args:
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Scala Output: Value of a: 1 Value o
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11. SCALA - FUNCTIONS Scala A funct
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Scala var sum:Int = 0 sum = a + b r
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Scala println("Arg value[" + i + "]
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Scala } Save the above program in D
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Scala logWithDateBound("message3" )
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Scala \>scala Demo Output Factorial
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Scala Currying Functions Currying t
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12. SCALA - CLOSURES Scala A closur
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13. SCALA - STRINGS Scala This chap
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Scala "My name is ".concat("Zara");
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Scala val name = “James” printl
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Scala b String Methods Following is
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Scala 27 28 29 30 31 32 33 34 35 36
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14. SCALA - ARRAYS Scala Scala prov
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Scala } println("Total is " + total
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Scala Save the above program in Dem
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Scala print( " " + x ) } println()
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15. SCALA - COLLECTIONS Scala Scala
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Scala val nums = Nil println( "Head
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Scala 1 2 3 4 5 6 7 8 9 10 11 12 13
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Scala 34 35 36 37 38 39 40 41 42 43
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Scala Find Common Values Insets You
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Scala 14 def diff(that: Set[A]): Se
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Scala 39 def sum: A Returns the sum
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Scala val nums: Map[Int, Int] = Map
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Scala colors.keys.foreach{ i => pri
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Scala 5 def iterator: Iterator[(A,
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Scala 30 def min: (A, B) Finds the
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Scala You can use Tuple to write a
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Scala Concatenated String: (1,hello
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Scala } } Save the above program in
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Scala 2 def isEmpty: Boolean Return
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Scala number of words Find Min & Ma
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Scala 4 def ++[B >: A](that :=> Gen
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Scala 28 def max: A Finds the large
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16. SCALA - TRAITS Scala A trait en
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Scala Value classes and Universal T
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17. SCALA - PATTERN MATCHING Scala
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Scala val charlie = new Person("Cha
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18. SCALA - REGULAR EXPRESSIONNS Sc
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Scala \\n Back-reference to capture
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Scala val pattern = new Regex("abl[
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Scala } } } } Save the above progra
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20. SCALA - EXTRACTORS Scala An ext
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Scala def main(args: Array[String])
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Scala print("Please enter your inpu
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