Lists

Lists are ordered collections. With a list, you can insert an element at a very specific location, as well as retrieve elements by the position in the collection. Kotlin provides a couple of pre-built methods for constructing immutable and mutable lists. Remember, immutability is achieved via interface. Here is how you would create lists in idiomatic Kotlin:

    val intList: List<Int> = listOf 
    println("Int  list[${intList.javaClass.canonicalName}]:${intList.joinToString(", ")}") 
 
    val emptyList: List<String> = emptyList<String>() 
    println("Empty  list[${emptyList.javaClass.canonicalName}]:${emptyList.joinToStrin g(",")}") 
 
    val nonNulls: List<String> = listOfNotNull<String>(null, "a", "b",  "c") 
    println("Non-Null string lists[${nonNulls.javaClass.canonicalName}]:${nonNulls.joinToString (",")}") 
 
    val doubleList: ArrayList<Double&gt...