thp-web/md/learn/functions/higher-order.md

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# Higher Order functions
## Function as parameter
```thp
fun map[A, B](Array[A] input, (A) -> B function) -> Array[B]
{
// implementation
}
```
## Function as return
```thp
fun generate_generator() -> () -> Int
{
// code...
return fun() {
322
}
}
val generator = generate_generator() // A function
val value = generate_generator()() // An Int
```