kOptional

Extended Java8 Optional Kotlin back-port for Android and JVM

Add kOptional to your build.gradle

compile "com.stepango.koptional:koptional:1.2.0" 

Usage example:

arrayOf(null, "1", null, "2", null, "3")

.map {
 it.toOptional() 
}

.mapIndexed {
 i, optional -> optional.ifEmpty {
 Log.e("kOptional", "$i element is null, it's bad") 
}
 
}

.map {
 it.map {
 "$it is not null " 
}
 
}

.forEach {
 it.ifPresent(::println) 
}
  // 1 is not null  // 2 is not null  // 3 is not null  Log:  // 0 element is null, it's bad // 2 element is null, it's bad // 4 element is null, it's bad