kotlin 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) // Error
