Std.MultiMap.groupBy
1 declaration
fn
groupBy: &Array[T] -> fn(T) -> K -> Std.MultiMap.MultiMap[K, T]This is a callable function.
What it does
Items collected under the key each one produces.
What Map.groupBy answers, in the shape that can then be added to.
Read the signature
- The text after the name is the type checked by Pudu.
- Read arrows from left to right: inputs come first, and the final type is returned.
- & borrows a value for this call instead of moving or copying it.
- Names inside [ ] are type arguments, such as the item type held by a collection.