scala_tutorial

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Scala print( " " + x ) } println() for ( x scalac Demo.scala \>scala Demo Output 10 12 14 16 18 10 11 12 13 14 15 16 17 18 19 Scala Array Methods Following are the important methods, which you can use while playing with array. As shown above, you would have to import Array._ package before using any of the mentioned methods. For a complete list of methods available, please check official documentation of Scala. S.No 1 2 3 Methods with Description def apply( x: T, xs: T* ): Array[T] Creates an array of T objects, where T can be Unit, Double, Float, Long, Int, Char, Short, Byte, Boolean. def concat[T]( xss: Array[T]* ): Array[T] Concatenates all arrays into a single array. def copy( src: AnyRef, srcPos: Int, dest: AnyRef, destPos: Int, length: Int ): Unit Copy one array to another. Equivalent to Java's System.arraycopy(src, srcPos, dest, destPos, length). 104
Scala 4 5 6 7 8 9 10 11 12 13 14 15 def empty[T]: Array[T] Returns an array of length 0 def iterate[T]( start: T, len: Int )( f: (T) => T ): Array[T] Returns an array containing repeated applications of a function to a start value. def fill[T]( n: Int )(elem: => T): Array[T] Returns an array that contains the results of some element computation a number of times. def fill[T]( n1: Int, n2: Int )( elem: => T ): Array[Array[T]] Returns a two-dimensional array that contains the results of some element computation a number of times. def iterate[T]( start: T, len: Int)( f: (T) => T ): Array[T] Returns an array containing repeated applications of a function to a start value. def ofDim[T]( n1: Int ): Array[T] Creates array with given dimensions. def ofDim[T]( n1: Int, n2: Int ): Array[Array[T]] Creates a 2-dimensional array def ofDim[T]( n1: Int, n2: Int, n3: Int ): Array[Array[Array[T]]] Creates a 3-dimensional array def range( start: Int, end: Int, step: Int ): Array[Int] Returns an array containing equally spaced values in some integer interval. def range( start: Int, end: Int ): Array[Int] Returns an array containing a sequence of increasing integers in a range. def tabulate[T]( n: Int )(f: (Int)=> T): Array[T] Returns an array containing values of a given function over a range of integer values starting from 0. def tabulate[T]( n1: Int, n2: Int )( f: (Int, Int ) => T): Array[Array[T]] Returns a two-dimensional array containing values of a given function over ranges of integer values starting from 0. 105
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Scala About the Tutorial Scala is a
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Scala 4. SCALA - DATA .............
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Scala Higher-Order Functions ......
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Scala Regular-Expression Examples .
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Scala Scala can Execute Java Code S
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Scala We assume that the readers of
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Scala Windows \>scala -version Scal
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Scala Welcome to Scala version 2.9.
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Scala $salary, 123abc, -salary Oper
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Scala Newline Characters Scala is a
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4. SCALA - DATA Scala Scala has all
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Scala "Hello,\nWorld!" "This string
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5. SCALA - VARIABLES Scala Variable
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Scala } Save the above program in D
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Methods Variables 6. SCALA - CLASSE
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Scala \>scala Demo Output Point x l
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Scala Implicit classes may not be
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7. SCALA - ACCESS MODIFIERS Scala T
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Scala } Scope of Protection Access
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8. SCALA - OPERATORS Scala An opera
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Scala == (Equal) 1 Checks if the va
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Scala It is called Logical AND oper
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Scala Ex: (A & B) will give 12, whi
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Scala \>scala Demo Output: a & b =
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Scala Try the following example pro
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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(
Page 62 and 63: 10. SCALA - LOOP STATEMENTS Scala T
Page 64 and 65: Scala while(condition) { Conditiona
Page 66 and 67: Scala jumps back up to do, and the
Page 68 and 69: Scala object Demo { } def main(args
Page 70 and 71: Scala } } Save the above program in
Page 72 and 73: Scala Scala's for loop allows to fi
Page 74 and 75: Scala \>scalac Demo.scala \>scala D
Page 76 and 77: Scala object Demo { def main(args:
Page 78 and 79: Scala Output: Value of a: 1 Value o
Page 80 and 81: 11. SCALA - FUNCTIONS Scala A funct
Page 82 and 83: Scala var sum:Int = 0 sum = a + b r
Page 84 and 85: Scala println("Arg value[" + i + "]
Page 86 and 87: Scala } Save the above program in D
Page 88 and 89: Scala logWithDateBound("message3" )
Page 90 and 91: Scala \>scala Demo Output Factorial
Page 92 and 93: Scala Currying Functions Currying t
Page 94 and 95: 12. SCALA - CLOSURES Scala A closur
Page 96 and 97: 13. SCALA - STRINGS Scala This chap
Page 98 and 99: Scala "My name is ".concat("Zara");
Page 100 and 101: Scala val name = “James” printl
Page 102 and 103: Scala b String Methods Following is
Page 104 and 105: Scala 27 28 29 30 31 32 33 34 35 36
Page 106 and 107: 14. SCALA - ARRAYS Scala Scala prov
Page 108 and 109: Scala } println("Total is " + total
Page 110 and 111: Scala Save the above program in Dem
Page 114 and 115: 15. SCALA - COLLECTIONS Scala Scala
Page 116 and 117: Scala val nums = Nil println( "Head
Page 120 and 121: Scala 1 2 3 4 5 6 7 8 9 10 11 12 13
Page 122 and 123: Scala 34 35 36 37 38 39 40 41 42 43
Page 126 and 127: Scala Find Common Values Insets You
Page 128 and 129: Scala 14 def diff(that: Set[A]): Se
Page 130 and 131: Scala 39 def sum: A Returns the sum
Page 132 and 133: Scala val nums: Map[Int, Int] = Map
Page 134 and 135: Scala colors.keys.foreach{ i => pri
Page 136 and 137: Scala 5 def iterator: Iterator[(A,
Page 138 and 139: Scala 30 def min: (A, B) Finds the
Page 140 and 141: Scala You can use Tuple to write a
Page 142 and 143: Scala Concatenated String: (1,hello
Page 144 and 145: Scala } } Save the above program in
Page 146 and 147: Scala 2 def isEmpty: Boolean Return
Page 148 and 149: Scala number of words Find Min & Ma
Page 150 and 151: Scala 4 def ++[B >: A](that :=> Gen
Page 152 and 153: Scala 28 def max: A Finds the large
Page 154 and 155: 16. SCALA - TRAITS Scala A trait en
Page 156 and 157: Scala Value classes and Universal T
Page 158 and 159: 17. SCALA - PATTERN MATCHING Scala
Page 160 and 161: 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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