Hey guys: I to access individual items in ItemList...

# getting-started

[andodeki]

Hey guys:
I to access individual items in ItemList but i am getting
below as output
how can i list only "Name1" and "Name2" from "defaultItems"
[Item(int=1, item=Category1, ItemList={Name=[]})]
null

data class Item(
    	var int: Int,
        var item: String,
        var ItemList: Map<String, List<Item>>
    )
    var defaultcategory = listOf(
        Item(1, "Category1", mapOf("Name" to listOf<Item>()))
    )
    var defaultItems = listOf(
        Item(1, "Item1",mapOf("Name1" to defaultcategory)),
        Item(2, "Item2",mapOf("Name2" to defaultcategory))
    )
    
    defaultItems.forEachIndexed { index, element ->
    	print(element.ItemList["Name1"])
        print("\n")
    }

[Stephan Schroeder]

I changed a few things in your code: ItemList should be lowercase, immutable val by default instead of var , a trailing comma for the itemList parameter and a unique result filter operation with first(predicate).let{...} to only work on the first item that contains the key Name1 in its itemList (use filter(predicate).forEach{...} if you want to iterate all the items that fullfill this condition.

fun main() {
    defaultItems.first{item->item.itemList.contains("Name1")}.let{itemWithName1->
        print(itemWithName1.itemList["Name1"])
	}
    
}

data class Item(
    val int: Int,
    val item: String,
    val itemList: Map<String, List<Item>>,
)

val defaultcategory = listOf(
    Item(1, "Category1", mapOf("Name" to listOf<Item>()))
)
val defaultItems = listOf(
    Item(1, "Item1",mapOf("Name1" to defaultcategory)),
    Item(2, "Item2",mapOf("Name2" to defaultcategory))
)