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Scala Find Common Values Insets You can use either Set.& method or Set.intersect method to find out the common values between two sets. Try the following example to show the usage. object Demo { def main(args: Array[String]) { val num1 = Set(5,6,9,20,30,45) val num2 = Set(50,60,9,20,35,55) } } // find common elements between two sets println( "num1.&(num2) : " + num1.&(num2) ) println( "num1.intersect(num2) : " + num1.intersect(num2) ) Save the above program in Demo.scala. The following commands are used to compile and execute this program. \>scalac Demo.scala \>scala Demo Output num1.&(num2) : Set(20, 9) num1.intersect(num2) : Set(20, 9) Scala Set methods Following are the important methods which you can use while playing with Sets. For a complete list of methods available, please check official documentation of Scala. SN Methods with Description 1 def +(elem: A): Set[A] Creates a new set with an additional element, unless the element is already present. 118
Scala 2 def -(elem: A): Set[A] Creates a new set with a given element removed from this set. 3 def contains(elem: A): Boolean Returns true if elem is contained in this set, false otherwise. 4 def &(that: Set[A]): Set[A] Returns a new set consisting of all elements that are both in this set and in the given set. 5 def &~(that: Set[A]): Set[A] Returns the difference of this set and another set. 6 def +(elem1: A, elem2: A, elems: A*): Set[A] Creates a new immutable set with additional elements from the passed sets 7 def ++(elems: A): Set[A] Concatenates this immutable set with the elements of another collection to this immutable set. 8 def -(elem1: A, elem2: A, elems: A*): Set[A] Returns a new immutable set that contains all elements of the current immutable set except one less occurrence of each of the given argument elements. 9 def addString(b: StringBuilder): StringBuilder Appends all elements of this immutable set to a string builder. 10 def addString(b: StringBuilder, sep: String): StringBuilder Appends all elements of this immutable set to a string builder using a separator string. 11 def apply(elem: A) Tests if some element is contained in this set. 12 def count(p: (A) => Boolean): Int Counts the number of elements in the immutable set which satisfy a predicate. 13 def copyToArray(xs: Array[A], start: Int, len: Int): Unit Copies elements of this immutable set to an array. 119
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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 } Save the above program in D
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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(
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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
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 112 and 113: Scala print( " " + x ) } println()
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 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
Page 162 and 163: 18. SCALA - REGULAR EXPRESSIONNS Sc
Page 166 and 167: Scala \\n Back-reference to capture
Page 168 and 169: Scala val pattern = new Regex("abl[
Page 170 and 171: Scala } } } } Save the above progra
Page 172 and 173: 20. SCALA - EXTRACTORS Scala An ext
Page 174 and 175: Scala def main(args: Array[String])
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Scala print("Please enter your inpu
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