#Lesson 41 : Kotlin map vs. flatMap

fun main(args: Array<String>) {

    val listofAlphabets = listOf(
        Alphabet(listOf("A", "B", "C")),
        Alphabet(listOf("D", "E", "F")),
        Alphabet(listOf("G", "H", "I"))
    )


    println("**** Map ****")
    val mapLists = listofAlphabets.map { it.items }
    println(mapLists)


    println("**** FlatMap ****")
    val flatMapList = listofAlphabets.flatMap {it.items}
    println(flatMapList)

    
}

*** Output ***

**** Map ****

[[A, B, C], [D, E, F], [G, H, I]]

**** FlatMap ****

[A, B, C, D, E, F, G, H, I]

Map : Returns a list containing the results of applying the given [transform] function

 to each element in the original collection

FlatMap : Returns a single list of all elements yielded from results of [transform] function being invoked on each element of original collection.