![]() ![]() 2.5.For some simple actions you can use the safe call operator, assuming the action also respects not operating on an empty list (to handle your case of both null and empty: myList?. In this example, weâre appending the List of elements of type Integer returned by the filterIsInstanceTo() function to the mutableList. Subsequently, we can use the filterIsInstanceTo() function to append a List of elements of a specified type to the destination List: val countråode = listOf("Germany", 49, null, "India", 91, "Japan", 81, "Brazil", null, "Australia", 61)ĪssertTrue(ntainsAll(listOf(1,24,49,91,81,61))) It is one of mutable nature, and it is inherited from the collection class the methods of the mutablelist interface will support for both read and write functionalities.In this case, weâre using the filterIsInstance() function to return a List of elements of type Integer. How Mutable List Works in Kotlin The mutable list interfaces and is one of the generic collections using the data elements. Val filterList = countråode.filterIsInstance()ĪssertTrue(ntainsAll(listOf(49,91,81,61))) The filterIsInstance() function can be used to return a List of elements of a specified type: val countråode = listOf("Germany", 49, null, "India", 91, "Japan", 81, "Brazil", null, "Australia", 61) ![]() One is using listOf () function and the other is using emptyList () function. In this example, the filterIndexedTo() function appends the resulting two elements matching the predicate to the mutableList. To create an empty list in Kotlin, we have two ways. ![]() Therefore both String.EMPTY constant and any constant denoted by '' literal will be represented with the same empty string instance at run time. It then returns a List of elements matching the given predicate: val filterList = countries.filterIndexed )ĪssertTrue(ntainsAll(listOf("United States","Canada","Germany","Australia"))) While itâs true that there can be many instances of empty string in a program, those empty strings that come from literal '' are usually interned by JVM. The predicate of this function uses both the index and the element as arguments. ![]() We can use the filterIndexed() function to utilize the element position in the filter. ![]()
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