Std.EnumMap.keysWhere

fn

This is a callable function.

What it does

The keys whose values the predicate accepts.

Answers keys rather than a smaller map, because a map with keys removed is

no longer total over the domain it claims, and quietly returning one would

give back the Option this module exists to remove.

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.