copy from:
https://stackoverflow.com/questions/35513636/multiple-variable-let-in-kotlin
For mixed types you could build a series of functions for each parameter count that may look silly, but work nicely for mixed types:
inline fun <T1: Any, T2: Any, R: Any> safeLet(p1: T1?, p2: T2?, block: (T1, T2)->R?): R? {
return if (p1 != null && p2 != null) block(p1, p2) else null
}
inline fun <T1: Any, T2: Any, T3: Any, R: Any> safeLet(p1: T1?, p2: T2?, p3: T3?, block: (T1, T2, T3)->R?): R? {
return if (p1 != null && p2 != null && p3 != null) block(p1, p2, p3) else null
}
inline fun <T1: Any, T2: Any, T3: Any, T4: Any, R: Any> safeLet(p1: T1?, p2: T2?, p3: T3?, p4: T4?, block: (T1, T2, T3, T4)->R?): R? {
return if (p1 != null && p2 != null && p3 != null && p4 != null) block(p1, p2, p3, p4) else null
}
inline fun <T1: Any, T2: Any, T3: Any, T4: Any, T5: Any, R: Any> safeLet(p1: T1?, p2: T2?, p3: T3?, p4: T4?, p5: T5?, block: (T1, T2, T3, T4, T5)->R?): R? {
return if (p1 != null && p2 != null && p3 != null && p4 != null && p5 != null) block(p1, p2, p3, p4, p5) else null
}
// ...keep going up to the parameter count you care about
Example usage:
val risk = safeLet(person.name, person.age) { name, age ->
// do something
}
