Dynamic groupingBy keyselector in Kotlin











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I would like to pass a dynamic keySelector to my groupingBy function. Is this possible? 



   private fun hasNumberOfIdenticalValues(hand: ArrayList<Card>, values: ArrayList<String>, limit: Int) : Boolean {

        var numberOfOccurrences : Map<String, Int> = hashMapOf()



        for(value in values) {

            numberOfOccurrences = hand.groupingBy{it.suit}.eachCount()

        }



        return true

    }





java kotlin







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    down vote

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    I would like to pass a dynamic keySelector to my groupingBy function. Is this possible? 



       private fun hasNumberOfIdenticalValues(hand: ArrayList<Card>, values: ArrayList<String>, limit: Int) : Boolean {
    
        var numberOfOccurrences : Map<String, Int> = hashMapOf()
    

    
        for(value in values) {
    
            numberOfOccurrences = hand.groupingBy{it.suit}.eachCount()
    
        }
    

    
        return true
    
    }





    java kotlin







    share|improve this question
























      up vote
      0
      down vote

      favorite









      up vote
      0
      down vote

      favorite











      I would like to pass a dynamic keySelector to my groupingBy function. Is this possible? 



         private fun hasNumberOfIdenticalValues(hand: ArrayList<Card>, values: ArrayList<String>, limit: Int) : Boolean {
      
        var numberOfOccurrences : Map<String, Int> = hashMapOf()
      

      
        for(value in values) {
      
            numberOfOccurrences = hand.groupingBy{it.suit}.eachCount()
      
        }
      

      
        return true
      
    }





      java kotlin







      share|improve this question













      I would like to pass a dynamic keySelector to my groupingBy function. Is this possible? 



         private fun hasNumberOfIdenticalValues(hand: ArrayList<Card>, values: ArrayList<String>, limit: Int) : Boolean {
      
        var numberOfOccurrences : Map<String, Int> = hashMapOf()
      

      
        for(value in values) {
      
            numberOfOccurrences = hand.groupingBy{it.suit}.eachCount()
      
        }
      

      
        return true
      
    }





      java kotlin




      java kotlin






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      asked Nov 10 at 19:28









      Paul Mcloughlin

      1,2782917




      1,2782917
























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          You can, you just need to return the string that will classify the interation. For instance, to separete the cards by color of the suit: 



          fun Card.color(): String {     
          
    return if(listof("diamonds","hearts").contains(this.suit)) 
          
        "red" 
          
    else 
          
        "black" 
          
}
          

          
for(value in values) {
          
    numberOfOccurrences = hand.groupingBy{it.color()}.eachCount()
          
}





          share|improve this answer





















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            up vote
            0
            down vote













            You can, you just need to return the string that will classify the interation. For instance, to separete the cards by color of the suit: 



            fun Card.color(): String {     
            
    return if(listof("diamonds","hearts").contains(this.suit)) 
            
        "red" 
            
    else 
            
        "black" 
            
}
            

            
for(value in values) {
            
    numberOfOccurrences = hand.groupingBy{it.color()}.eachCount()
            
}





            share|improve this answer

























              up vote
              0
              down vote













              You can, you just need to return the string that will classify the interation. For instance, to separete the cards by color of the suit: 



              fun Card.color(): String {     
              
    return if(listof("diamonds","hearts").contains(this.suit)) 
              
        "red" 
              
    else 
              
        "black" 
              
}
              

              
for(value in values) {
              
    numberOfOccurrences = hand.groupingBy{it.color()}.eachCount()
              
}





              share|improve this answer























                up vote
                0
                down vote










                up vote
                0
                down vote









                You can, you just need to return the string that will classify the interation. For instance, to separete the cards by color of the suit: 



                fun Card.color(): String {     
                
    return if(listof("diamonds","hearts").contains(this.suit)) 
                
        "red" 
                
    else 
                
        "black" 
                
}
                

                
for(value in values) {
                
    numberOfOccurrences = hand.groupingBy{it.color()}.eachCount()
                
}





                share|improve this answer












                You can, you just need to return the string that will classify the interation. For instance, to separete the cards by color of the suit: 



                fun Card.color(): String {     
                
    return if(listof("diamonds","hearts").contains(this.suit)) 
                
        "red" 
                
    else 
                
        "black" 
                
}
                

                
for(value in values) {
                
    numberOfOccurrences = hand.groupingBy{it.color()}.eachCount()
                
}






                share|improve this answer












                share|improve this answer



                share|improve this answer










                answered Nov 10 at 20:08









                Raphael

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