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enil/optional_map.kt

Created September 28, 2016 08:06
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Map an optional value in kotlin
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optional_map.kt
fun <T,U> T?.map(mapping: (T) -> U) = when (this) {
null -> null
else -> mapping(this)
}
@silmeth
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silmeth commented Jun 8, 2017

This should also work:

fun <T,U> T?.map(mapping: (T) -> U) = this?.let { mapping(it) }

And generally you can map any nullable using ?.let { /* do your mapping here */ }.

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