Marc Moreno Ferrer Atternatt
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| inline fun <A, B> A?.fold(crossinline fn: () -> B, crossinline f: (A) -> B): B = | |
| if (this == null) fn() else f(this) | |
| inline fun <A, B> A?.map(crossinline f: (A) -> B): B? = fold({ null }, f) | |
| inline fun <A> A?.orElse(crossinline fn: () -> A): A = fold(fn, { it }) |