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Add mapNotNull extension #221

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derektom14 opened this issue Oct 6, 2019 · 1 comment · May be fixed by #251
Open

Add mapNotNull extension #221

derektom14 opened this issue Oct 6, 2019 · 1 comment · May be fixed by #251

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@derektom14
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Add an extension method to each Rx chain that has a value to match Kotlin's mapNotNull.
https://kotlinlang.org/api/latest/jvm/stdlib/kotlin.collections/map-not-null.html

Sample implementations:

fun <T, R> Single<T>.mapNotNull(transform: (T) -> R?) = flatMapMaybe { value -> 
    Maybe.fromCallable {
        transform(value)
    }
}

fun <T, R> Observable<T>.mapNotNull(transform: (T) -> R?) = flatMapIterable { value -> 
    listOfNotNull(transform(value))
}
@hoc081098 hoc081098 linked a pull request Feb 4, 2023 that will close this issue
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@hoc081098
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I have created PR #251. Hope maintainer will look at it

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feat(mapNotNull): add Observable.mapNotNull, Flowable.mapNotNull hoc081098/RxKotlin
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@derektom14 @hoc081098