Reaktive null-safety exmaples

reaktive_null_safety_examples.kt

// 1
observableOf<String>(null) // Compilation error

// 2
val o1: Observable<String?> = observableOf(null)
val o2: Observable<String> = o1 // Compilation error, types do not match

// 3
val o1: Observable<String?> = observableOf(null)
val o2: Observable<String> = o1.notNull() // No error, null values filtered out

// 4
val o1: Observable<String> = observableOf(“Hello”)
val o2: Observable<String?> = o1 // No error

// 5
val o1: Observable<String?> = observableOf(null)
val o2: Observable<String> = observableOf(“Hello”)
val o3: Observable<String?> = merge(o1, o2) // No error
val o4: Observable<String> = merge(o1, o2) // Compilation error, types do not match