15 lines
238 B
Plaintext
15 lines
238 B
Plaintext
pub fn map(opt: Option<a>, f: fn(a) -> result) -> Option<result> {
|
|
when opt is {
|
|
None -> None
|
|
Some(a) -> Some(f(a))
|
|
}
|
|
}
|
|
|
|
test map_1() {
|
|
map(None, fn(_) { 14 }) == None
|
|
}
|
|
|
|
test map_2() {
|
|
map(None, fn(_) { Void }) == None
|
|
}
|