Junior
What are double exclamation marks used for?
sobes.tech AI
Answer from AI
They are used to convert a nullable type to a non-nullable type, throwing a NullPointerException if the value is null. This is called the "not null assert operator".
// Declare a nullable string
var nullableString: String? = "Hello"
// Use the not null assert operator
val nonNullableString: String = nullableString!!
// If nullableString were null, an NPE would be thrown here