When casting Any? to List<String>, there is a warning of Unchecked Cast: Any? to List<String>.
// items is Any?val ids = items as List<String>If you trust the source to contain the appropriate type, you use
@Suppress("UNCHECKED_CAST")val ids = items as? List<String>For UNCHECKED_CAST in object constructor or function parameters.
@Suppress("UNCHECKED_CAST")val item = Quote( mainTags = mainTags as? List<String> )If you don't trust the source and want to do runtime checking and verification
val ids = items as? List<*>if (ids != null) { for (id in ids.filterIsInstance<String>()) { // do something }}NOTE: filterIsInstance only return elements which match the type (and remove those who doesn't)
or
val ids = items as? List<*>for (id in ids) { if (id is String) { // do something }}