Question

How to define list in Scala

Answer 1

object O {
    def main(args: Array[String]): Unit = {
        val lst = List("scala", "c", "c++", "java")

        lst.foreach(println(_))
    }
}
 
  
  
  
/*
run:
  
scala
c
c++
java
  
*/

 

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Answer 2

object O {
    def main(args: Array[String]): Unit = {
        val lst = 1 :: 7 :: 5 :: 4 :: Nil

        print(lst)
        
        println()
        
        lst.foreach(println(_))
    }
}
 
  
  
  
/*
run:
  
List(1, 7, 5, 4)
1
7
5
4
  
*/

 

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Answer 3

object O {
    def main(args: Array[String]): Unit = {
        val lst = List[Number](1, 3.14, 21d, 0xA)

        print(lst)
        
        println()
        
        lst.foreach(println(_))
    }
}
 
  
  
  
/*
run:
  
List(1, 3.14, 21.0, 10)
1
3.14
21.0
10
  
*/

 

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Answer 4

object O {
    def main(args: Array[String]): Unit = {
        val lst = List.range(1, 10)

        print(lst)
        
        println()
        
        lst.foreach(println(_))
    }
}
 
  
  
  
/*
run:
  
List(1, 2, 3, 4, 5, 6, 7, 8, 9)
1
2
3
4
5
6
7
8
9
  
*/

 

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Answer 5

object O {
    def main(args: Array[String]): Unit = {
        val lst = List.range(1, 10, 2)

        print(lst)
        
        println()
        
        lst.foreach(println(_))
    }
}
 
  
  
  
/*
run:
  
List(1, 3, 5, 7, 9)
1
3
5
7
9
  
*/

 

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Answer 6

object O {
    def main(args: Array[String]): Unit = {
        val lst = List.fill(4)("test")
        
        print(lst)
        
        println()
        
        lst.foreach(println(_))
    }
}
 
  
  
  
/*
run:
  
List(test, test, test, test)
test
test
test
test
  
*/

 

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Answer 7

object O {
    def main(args: Array[String]): Unit = {
        val lst = List.tabulate(6)(x => x * x)
        
        print(lst)
        
        println()
        
        lst.foreach(println(_))
    }
}
 
  
  
  
/*
run:
  
List(0, 1, 4, 9, 16, 25)
0
1
4
9
16
25
  
*/

 

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