!! in kotlin
//The not-null assertion operator
val l = b!!.length!! in kotlin
//The not-null assertion operator
val l = b!!.lengthkotlin Null Safety
// Variable types in Kotlin don't allow the assignment of null.
// Declare a nullable varible by adding ? at the end of its type.
var neverNull: String = "This can't be null"
neverNull = null // Error
var nullable: String? = "You can keep a null here"
nullable = null // Ok
var inferredNonNull = "The compiler assumes non-null"
inferredNonNull = null // Error
fun strLength(notNull: String): Int {
return notNull.length
}
strLength(neverNull) // Ok
strLength(nullable) // ErrorCopyright © 2021 Codeinu
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